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TempZone™ Floor Heating Cable (Twin) 240V, (3W/ft.), 235 ft., 3.0A

TempZone™ Floor Heating Cable (Twin) 240V, (3W/ft.), 235 ft., 3.0A

Part Number: TCT240-3W-235Past Model
This product is discontinued.
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Support Questions

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Yes. Unlike the heating cable for electric floor heating, the cold lead wires can be trimmed.

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To prevent any melting, ensure that the heating wire is at least 4” from the toilet wax ring.

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When installing electric floor heating over a concrete slab, an insulating underlayment like ThermalSheet is highly recommended to ensure efficient operation, faster heating times and warmer floor temperatures.

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Electric-resistance heating cables and systems have no polarity. This includes all current WarmlyYours heating elements.

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When WarmlyYours electric floor heating systems are being installed on a concrete slab, we strongly recommend adding a layer of insulation over the slab prior to installing the system. While our electric floor heating provides up to 25% more heating power per square foot than many of our competitors, the slab will always act as a "heat sink." Some of the heat that would otherwise be transferred to the flooring surface will remain in the slab, causing the floor’s surface temperature to be considerably lower. This is true with any electric radiant floor heating system.

When installed on top of a concrete slab without insulation, it is generally accepted that electric floor heating will take the chill away from the floor and provide a small amount of warmth. Adding insulation on top of the slab and beneath any electric radiant floor heating system will allow a greater percentage of the heat generated to transfer to the flooring surface. This results in greater efficiency and therefore faster warm up times, higher expected surface temperatures and lower energy usage. The floor will have the capacity to warm to a comfortable temperature, and in some cases can be employed as the primary heat source for that room.

The recommended types of insulation are natural cork, insulated tile backer boards and insulated underlayment, such as ThermalSheet™ synthetic cork.

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The breaker and wire sizes are selected based on the total amperage of the WarmlyYours heating system connected to a single thermostat. This information is on the WarmlyYours heating system's installation plan, electrical plan, or UL label. Based on guidelines from the National Electrical Code: loads up to 16 Amps may utilize 12 gauge wire with a 20-Amp breaker, and loads up to 12 Amps - 14 gauge wire with a 15-Amp breaker. Local code and/or other factors may change these guidelines.

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WarmlyYours’ 25-Year No Nonsense™ Warranty is the most comprehensive warranty in the industry. In the event of a defect, we cover not only the repair or replacement of the TempZone™ system, but ALSO any labor costs AND flooring materials required to perform the repair. We do not cover the cost of flooring that needs to be replaced in the event of a repair necessitated due to damage. If a product is damaged by a power surge, that would not be covered by our warranty

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One thermostat can control multiple heating mats/cables as long as all the heating elements are using less than 15 amps:

TempZone™ will cover aprx. 120 sq. ft. for 120V systems and 240 sq. ft. for 240V systems on one thermostat.

Environ™ will cover aprx. 150 sq. ft. for 120V systems and 300 sq. ft. for 240V systems on one thermostat.

Slab Heat will cover aprx. 90 sq. ft. for 120V systems and 180 sq. ft. for 240V systems on one thermostat.

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No. Never cut the heating cable. The floor heating cable is designed with a very specific resistance in order to consistently maintain heating at the chosen wattage per square foot. Trimming the heating cable would lower the resistance of the cable causing the system to overheat. Adding heating cable to the system would raise the resistance and the system would not heat properly.

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Our TempZone electric floor heating products are waterproof and wet location listed.

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No. A bathroom floor would be installed in the same way. Our TempZone floor heating systems are wet-location listed and ideal for bathroom floors.

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Yes. In addition to TempZone™ and Slab Heat, we also have specially sized Shower and Bench mats designed specifically for shower installation. They are all wet location listed for radiant floor heating in a shower.

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Yes, Luxury Vinyl Tile (LVT) is typically installed over the embedded heating element using self-leveling cement (SLC). Many people choose to use SLC when installing tile over floor heating.

We do not suggest using thinset to encase the heating wires with LVT, as it is very difficult to get thinset completely flat.

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WarmlyYours has recently begun including floor sensors with our heating elements to help ensure customers will have everything they need for optimal operation of their radiant heating systems.

The sensor included with your floor heating element can be installed with the heating system (the sensor is equally spaced between runs of the heating wire--see your install manual for more info). Installing this sensor with your floor heating control will enable energy efficient operation of the floor warming system based on the floor temperature instead of the ambient room temperature.

We generally recommend that you install a second, unconnected backup floor sensor alongside the primary one. In the very unlikely event that your first floor sensor is damaged, this install method will save you from having to pry up flooring to replace a floor sensor. You simply disconnect the damaged sensor from the thermostat and connect the backup sensor.

In addition to the floor sensor that was included with your heating element, our nSpiration Series thermostats also come with a floor sensor. If you purchase both a heating element and an nSpiration Series thermostat from WarmlyYours, you'll have a primary and a backup floor sensor for your system.

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Make sure any cracks or raised edges are sanded down before installation. Seal and patch cracks where possible. If needed, pour a layer of self-leveling cement to make sure surface is level and flat. Then proceed with instructions to install desired floor heating system and flooring.


It is strongly recommended that an insulating underlayment be installed between the slab and heating element to prevent heat loss.

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We suggest the heating product be embedded in a minimum of 3/8" of self-leveling cement (SLC). Always check with the manufacturer for specific recommendations.

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The ground wire in the floor mat must be connected directly to the ground wire of the supply or to the house ground wire.

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There are heating systems designed for floating floors, such as our Environ system. However, the flooring must be rigid enough so it does not mold itself to the heating cables over time.

Check the flooring manufacturer's floor heating recommendations. In most cases, the heating system will need to be embedded beneath the flooring. Check for all "flatness" requirements for the flooring you choose. The flattest floors utilize self-leveling cement when installed correctly.

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The TempZone™ twin conductor cable present in our TempZone™ products is comprised of a double-insulated, coaxial heating cable. The total thickness of the system can be between ⅛” and 5/32” thick and will not noticeably affect the height of your installed flooring.

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Reflective insulation is not effective with conductive heating, which is how embedded floor heating and snow-melting systems transfer heat. To be effective, the reflective insulation surface needs to face an air space (air gap), which allows the reflected heat to be redirected.

An effective solution considers the insulating material's R-Value. This is the rating of a material's insulating properties. The "R" stands for "resistance" and refers to the material's resistance to heat flow, or temperature conduction.

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Resistance greater than this value may result in overheating or even total failure of the floor heating system. This may be caused by a crimping or other damage to the wire.

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Yes, we offer several options to help make your floor heating system water resistant or waterproof. Our TempZone product line is designed for wet areas - making it completely safe for rooms that will have water on the floor at times or may experience leaks or flooding. We also offer waterproofing bands for our TempZone Cable + Prodeso Uncoupling Membrane system. Allowing you to waterproof all seams and the perimeters of the wall - guaranteeing that your floor heating system stays safe and prevents water from leaking to areas below.

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Most laminate flooring manufactured today are made of wood flour and resin composites. However, there are still some manufacturers making laminates primarily of real wood. This is important because a primarily wood laminate can be floated over the Environ™ floor heating product. Otherwise, if it is not made primarily of wood, the flooring will require the TempZone™ floor heating product embedded in thin-set or self-leveling cement.

Check the laminate manufacturer’s material composition, the specific product warranty for radiant or electric heat exclusions, and the installation documentation for compatibility. A clue that it’s not a wood laminate is if 1/2” separation is required between the heaters and the laminate.

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A digital meter with a 0-200 Ohms scale ( Ω ) to measure the heating wire's resistance, and a 20K scale to measure the sensor's resistance.

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Never cut, shorten or splice the heating cable itself; cutting it damages the system. Only the non-heating cold lead can be shortened, as your product’s manual allows. Order the size your SmartPlan™ specifies, because unused cable can’t be cut off.

Some mats let you cut the mesh, never the cable, to turn or reposition them: TempZone™ and Environ™ Flex Rolls and Slab Heat mats. TempZone™ Easy Mats and Custom Mats are made to size and must not be shortened or cut. TempZone™ Cable has no mesh: lay all of it at the spacing on your SmartPlan™.

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Yes, many homeowners successfully install bathroom floor heating systems themselves. WarmlyYours provides detailed installation manuals, 24/7 technical support, and custom installation plans to guide you through the process. However, a licensed electrician is required to perform the final electrical connections and thermostat wiring to ensure safety and warranty compliance.

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Yes — electric radiant floor heating can absolutely be installed in a tiny house on wheels (THOW). Here are the key considerations:

Power Supply

Electric radiant floor heating requires a 120V or 240V connection, which is the same standard shore power connection used at RV parks and tiny house communities. When plugged in, the system runs just like it would in a stationary home.

  • Most WarmlyYours systems run on 120V or 240V
  • A dedicated circuit is required — your electrician will add this during installation
  • The system does not run on battery/solar alone without a significant battery bank and inverter

Subfloor Considerations

THOWs typically use a wood subfloor. WarmlyYours TempZone™ Cable or Flex Rolls can be installed in a thin mortar bed or self-leveling underlayment over the subfloor before your finish flooring goes down.

Weight

Electric radiant heating cables and mats are extremely lightweight — typically less than 0.5 lbs per square foot — so they add virtually no meaningful weight to a THOW trailer.

Insulation is Critical

For a THOW, insulating the subfloor from below is especially important to prevent heat loss through the trailer frame. WarmlyYours recommends installing rigid foam insulation beneath the heating system for maximum efficiency.

Get a free SmartPlan™ from WarmlyYours — our engineers will design a custom layout for your THOW floor plan at no charge.

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Most of the installation — laying out the heating element, placing the floor sensor, and pouring self-leveling cement — can be completed as a DIY project by a competent homeowner. However, the final thermostat wiring connection must be completed by a licensed electrician in most jurisdictions.

WarmlyYours makes DIY installation easier with:

  • SmartPlan® — a free custom layout service that maps out your exact cable placement, sensor location, and electrical requirements
  • Circuit Check — a monitoring device that alerts you if the heating cable is damaged during installation
  • 24/7 technical support — available throughout your installation

Always check local electrical codes before beginning any floor heating installation.

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Yes, we recommend using the Tempzone system encased in ⅜“-½“ of self-leveling cement followed by LVT.

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Yes. The finish layer needs to be 1/2" thick. This can be done if the brand of Self-Leveling Cement (SLC) is engineered to be a final flooring surface.  Most SLC products aren't designed to be the finish surface.

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Yes, electric radiant floor heating can maintain a cozy 70°F even when outside temperatures drop well below zero. By heating the objects and people in a room directly, a properly sized and insulated system provides reliable, consistent warmth that outperforms traditional forced-air systems during extreme Midwestern winters.

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Yes, but the tear-out is the real risk. Scan the floor with thermal imaging before demo to map the existing hydronic tubing, and never fasten or drill into it. Keep the two systems on fully independent controls so they cannot fight each other, and do not place the electric floor sensor directly above a hydronic loop — the false-high reading will short-cycle the electric system. Call PRO technical support at 800-875-5285 to review the assembly before ordering.

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No. Electric floor heating cable is listed for installation under floor coverings only, and NEC 424.38(A) does not permit heating cable to be installed in walls. Running it vertically voids both the UL listing and the warranty. For warm towels and a little extra room heat, specify a heated towel rack, which is designed and listed for wall mounting.

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Yes, radiant floor heating can be a primary heat source if its heat output exceeds the room's heat loss. For best results, we recommend using a 15-watt system, covering at least 80% of the floor, and ensuring the space is well-insulated. Use our Heat Loss Calculator to verify your specific needs.

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In many cases, yes — electric radiant floor heating can serve as the primary heat source in a tiny house, particularly in mild to moderate climates. Here's what to consider:

When floor heating works as primary heat

  • The tiny house is well-insulated (walls, roof, and subfloor)
  • You live in a climate where winter temperatures rarely drop below 20°F (-7°C)
  • The floor heating covers the majority of the open floor area
  • Windows and doors are properly sealed and double-paned

How to check if it's enough

Use the free WarmlyYours Heat Loss Calculator. It calculates your tiny house's heat loss based on insulation values, climate zone, and square footage — then tells you whether a floor heating system can offset that loss.

In colder climates

In very cold climates (below -10°F / -23°C design temperatures), floor heating is best used as a supplemental heat source alongside a mini-split, wood stove, or propane heater. It will still dramatically improve comfort and reduce the load on your primary system.

Contact the WarmlyYours team for a free SmartPlan™ — a custom layout designed specifically for your tiny house floor plan.

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Yes, bedroom floor heating can be a DIY project. Systems like TempZone Easy Mats or Environ Flex Rolls are designed for straightforward installation under various flooring types. While you can lay the heating elements and flooring yourself, you must hire a certified electrician to connect the system to power and install the thermostat.

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Yes — insulating underlayment is strongly recommended when installing electric radiant floor heating over a concrete basement slab. Without it, a significant portion of the heat will conduct downward into the cold concrete rather than upward through the floor surface where you want it.

WarmlyYours recommends ThermalSheet® insulating underlayment for basement slab installations. It improves system efficiency, reduces operating costs, and helps the floor reach target temperature faster.

Skipping underlayment on a basement slab is one of the most common — and most costly — installation mistakes.

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Yes, we strongly recommend installing insulation like ThermalSheet™ over concrete slabs. Concrete acts as a "heat sink," absorbing warmth that should go to your floor. Insulation directs the heat upward, significantly improving efficiency, reducing warm-up times, and allowing the system to function effectively as a primary heat source.

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No—electric floor heating systems like WarmlyYours TempZone are designed for DIY installation. The heating mat or cable is embedded in the thinset mortar layer during tile installation, which most experienced DIYers can complete without a professional. However, the electrical connection to the thermostat should be done by a licensed electrician in most jurisdictions.

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Underlayment is recommended for floating floors (laminate, LVP, wood) and installations over cold subfloors like concrete. It provides thermal insulation to prevent heat loss and improves system efficiency. For tile and stone, the system is typically embedded in thinset, so a separate underlayment is often unnecessary.

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No separate GFCI breaker is required — every WarmlyYours thermostat has a built-in Class A (5mA) GFCI. Stacking a GFCI breaker on top of it is one of the most common causes of nuisance tripping. Run a dedicated breaker sized to the load at 80% continuous duty: a 15A circuit carries up to 1,440W at 120V, a 20A circuit up to 1,920W. Loads beyond the thermostat’s 15A rating need a power module or relay.

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Turn the power (circuit breaker typically) to the thermostat off for 5 minutes and then back on to reset the thermostat.

If there is power to the thermostat and it still doesn't appear to work, then the next step toward a solution is to take Ohm measurements of the floor heating system.

This is done with a digital multi-meter that can select a low 200 Ohm (Ω) scale. To conduct this test, turn off the circuit breaker. Remove the thermostat completely from the wall and disconnect the wires connected to the LOAD connections at the back of the thermostat. Disconnect the ground wires from the house ground, and do the test shown on the links below. If you are uncomfortable doing this test, contact a qualified electrician.

Please follow one of these guides based on the type of heating system installed:

TempZone Single Conductor

TempZone Twin Conductor

For a quick overview of the testing process:

Here is a video showing how the test is done

Here is a video showing how to locate and identify the floor heating wires

If the system still does not function, contact +1 (800) 875-5285 WarmlyYours Technical Support and provide the Ohm measurements for further assistance.

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Single Conductor vs. Twin Conductor Identification

  • A single conductor floor heating system is a loop of one core wire, it starts at the thermostat and ends at the thermostat - this is the original method of manufacturing heating cable. Most single conductor floor heating systems have the same color cold lead wire connected to both load terminals/pigtails of the thermostat. Some early single conductor floor heating systems were produced with a white and a yellow cold lead wire.
  • A twin conductor floor heating system terminates two core wires at the end, both wires start at the thermostat - this is the current method of manufacturing heating cable. Most twin conductor floor heating systems will have two different colored cold lead wires, and one of these is black. The other wire in a WarmlyYours floor heating system is either yellow (120V system) or red (240V system).  A few early Environ systems had two black cold lead wires.

Note:

- Not all heating cables are wired directly to the thermostat. It may have been necessary during installation to terminate the heating cable in a junction box, and then run a separate (contractor-supplied) wire from the junction box to the thermostat.

- WarmlyYours single conductor cold leads were produced with a 13‘ length at the start of the loop, and a 26‘ length at the end.  The 120V floor heating systems had a yellow and a white label attached to the cold leads, and the 240V floor heating systems had a red and a white label attached. 

- If you have a single conductor floor heating system and notice that one cold lead is thicker or feels hotter than the other, please contact technical support at +1 (800) 875-5285 

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To prepare a basement for radiant heating, ensure the concrete subfloor is level, clean, and free of debris. It is highly recommended to install an insulating underlayment, WarmlyYours ThermalSheet, over the slab to prevent heat loss into the ground. Finally, verify that your electrical panel has sufficient capacity for the system’s requirements.

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Test the TempZone floor heating cable using a digital ohm meter as shown here.

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Installation time depends on the room, subfloor preparation, heating layout, and tile assembly. TempZone mats or cable are installed in the approved mortar or underlayment below the tile, with the final electrical connection made by a qualified electrician. Do not energize the heating system until the mortar, underlayment, and grout have fully cured for the time specified by their manufacturers; a universal 24–48-hour waiting period is not appropriate.

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Both are 15 feet long.

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One watt equals about 3.412 BTU per hour. TempZone™ Flex Rolls, Easy Mats and Shower Mats, and TempZone™ Cable at 3-inch spacing, deliver 15 watts per square foot: about 51 BTU per hour for every square foot of heated floor. Environ™ delivers 12 watts per square foot, about 41 BTU per hour. For any product, multiply the wattage on its label by 3.412.

Only heated floor counts, and heating can’t run under cabinets or fixtures: 100 square feet of 15-watt heating produces about 5,100 BTU per hour. Compare that with your room’s heat loss.

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TempZone™ Flex Rolls, Easy Mats and Shower Mats deliver 15 watts per square foot, and Custom Mats 12 to 15. TempZone™ Cable and Ruler Cable deliver 3.7 watts per linear foot, so their output depends on spacing: about 15 watts per square foot at 3 inches, 11 at 4 and 9 at 5. See TempZone Cable spacing and attachment.

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The cost of radiant floor heating for a tiny house is very affordable — especially compared to a full-size home — because you're heating a much smaller area.

Typical Cost Breakdown

  • Materials: A WarmlyYours electric floor heating system typically costs $8–$14 per square foot for the heating element, depending on the product (mat vs. cable) and coverage area.
  • Thermostat: A programmable or smart thermostat adds approximately $100–$250.
  • Installation labor: If hiring an electrician, expect $200–$500 for a tiny house, since the runs are short and the system is straightforward.

Example: 200 sq ft Tiny House

For a 200 sq ft tiny house (heating roughly 150 sq ft of open floor area after accounting for furniture), total installed cost is typically in the range of $1,500–$2,500 — a fraction of the cost of installing a forced-air or mini-split system.

Operating Costs

Electric radiant floor heating in a tiny house typically costs $0.50–$2.00 per day to operate, depending on your local electricity rate and how long the system runs. Use the WarmlyYours Energy Use Calculator to get a precise estimate for your space.

WarmlyYours also offers a Heat Loss Calculator to determine whether floor heating alone can serve as your primary heat source in a tiny house.

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Operating costs for electric radiant floor heating in a basement depend on your local electricity rate, the size of the heated area, and how many hours per day the system runs.

As a real-world example, a finished basement playroom in Whitchurch-Stouffville, Ontario cost approximately $0.19 CAD per hour to operate — significantly less than running a portable electric space heater, and with whole-floor comfort rather than point-source heat.

In the US, typical operating costs range from $0.01–$0.15 USD per hour depending on system size and local electricity rates. Use the WarmlyYours Operating Cost Calculator to estimate your specific project.

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Because radiant systems have a thermal lag, you should increase your thermostat set point 12-24 hours before an extreme cold snap arrives. This proactive adjustment, combined with ensuring your home is well-insulated, helps your system maintain a steady, comfortable temperature without struggling to catch up.

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Electric radiant floor heating can serve as a primary heat source in a well-insulated basement, particularly for finished basement spaces used as living areas, playrooms, or home offices.

Unlike forced air systems, radiant heat warms objects and people from the floor up — which is especially effective in basements where cold radiates upward from the concrete slab. This makes it a more efficient and comfortable option than forced air in below-grade spaces.

For larger or poorly insulated basements, a heat loss calculation (available free through WarmlyYours SmartPlan®) will confirm whether the system can meet the full heating load or whether it should supplement an existing system.

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Yes — radiant floor heating is one of the best heating solutions for tiny houses. Here's why it's such a natural fit:

  • Space-saving design: Electric radiant heating cables or mats install directly under the floor, so there are no bulky radiators, baseboard heaters, or ductwork taking up precious square footage.
  • Even, comfortable warmth: Heat rises uniformly from the floor up, eliminating cold spots — critical in a small space where every corner matters.
  • Silent operation: No fans, no blowers, no noise — ideal for the minimalist tiny house lifestyle.
  • Energy efficiency: Because tiny houses have a small footprint, the cost to heat them with electric radiant is very low. WarmlyYours' Energy Use Calculator can estimate your exact operating cost.
  • Compatible with most floor types: Works under tile, stone, laminate, engineered hardwood, and luxury vinyl plank (LVP) — all popular in tiny homes.

WarmlyYours offers electric radiant floor heating systems that are easy to customize for any tiny house layout, including irregular shapes and small rooms.

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Radiant floor heating can heat a sunroom if the space has high-quality insulation and double-pane glass. Since sunrooms have high heat loss, a 15-watt system is essential. In extremely cold climates or poorly insulated sunrooms, it is best used as a supplemental source to keep the floor comfortable.

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Radiant heating is often more efficient because it eliminates the "blast and fade" cycles and noisy ductwork of forced-air furnaces. By providing steady, low-level heat that doesn't escape to the ceiling, it creates a more consistent "barefoot sanctuary" while potentially reducing your overall energy consumption.

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Yes. Radiant heat warms people and objects directly instead of blowing heated air, so there’s no ductwork to lose heat through. Your cost in cold weather depends on insulation, how much area you heat and how long the system runs, so control it with a programmable thermostat.

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A variance of +/- 15% is acceptable.

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For the same wattage and operating time, 120V and 240V electric floor heating use the same amount of energy and produce the same heat. A 240V system draws less current for the same wattage, which can accommodate a larger heated area on a suitable circuit. Choose the heating product and control voltage to match the supply, and have an electrician verify circuit capacity, wiring, and applicable code.

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An uncoupling membrane like Prodeso provides a flexible layer between your subfloor and tile, preventing cracks caused by natural floor movement. It also offers waterproofing and vapor management, making it ideal for bathrooms. Plus, the membrane’s studs make cable installation fast and consistent without the need for staples or glue.

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The best home features for cold climates include a simple gable roof to shed snow, covered entrances for protection, airtight triple-pane windows to prevent heat loss, and radiant heating systems. These features work together to maintain interior warmth, reduce energy bills by up to 25%, and ensure structural safety during harsh winters.

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Resistance below this value may result in no heating or cold spots in the floor. This may be caused by exposure to moisture or other conductive material that penetrates the core insulation.

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WarmlyYours electric radiant floor heating is compatible with most flooring types commonly used in tiny houses:

  • ✅ Tile & Stone — The best conductor of heat; ideal for bathrooms and kitchens in tiny homes.
  • ✅ Luxury Vinyl Plank (LVP) — Very popular in tiny houses; compatible when the product has a thermal resistance (tog) rating of 1.0 or less.
  • ✅ Laminate — Works well; look for laminate rated for use with underfloor heating.
  • ✅ Engineered Hardwood — Compatible; solid hardwood is generally not recommended due to expansion and contraction.
  • ✅ Carpet — Works for supplemental heat; thinner carpet with low tog ratings is preferred.
  • ❌ Solid Hardwood — Not recommended; the heat can cause warping and cracking over time.

Key Tip: Check the Tog Rating

The tog rating measures a floor covering's thermal resistance. For radiant floor heating to work efficiently, the combined tog rating of your flooring and underlayment should be 1.5 tog or less. Always check with your flooring manufacturer.

Not sure if your flooring is compatible? The WarmlyYours team is happy to help you choose the right system for your specific floor type.

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For tile floors, electric radiant heating mats (like the WarmlyYours TempZone Floor Heating Mat) are the most popular choice because they embed directly in the thinset mortar layer without raising floor height significantly. For irregular room shapes, TempZone Flex Roll or TempZone Cable with Grip Strips offer more flexibility. All three systems work with ceramic, porcelain, and natural stone tile.

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For maximum barefoot comfort, most systems are designed to reach a floor surface temperature of 80°F to 85°F. This "sweet spot" ensures your room stays warm through efficient radiation while keeping the floor perfectly comfortable to walk on, even during the coldest months of the year.

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In TempZone™ Flex Rolls, Easy Mats and Shower Mats, the heating cable is fixed 3 inches apart. Custom Mats follow each design. TempZone™ Cable and Ruler Cable are spaced as you install them: 3, 4 or 5 inches on GripStrips™, or set by the membrane, and never closer than 3 inches. See TempZone Cable spacing and attachment.

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The amount of amperage draw depends upon how large the area is that you are heating. For coverage of areas less than 30 square feet, a 120V TempZone system will draw less than 4 amps. If you have a larger area over 240 square feet of heated space, then you will need a larger breaker plus additional controls. No matter what the size of the area you choose to heat, we recommend a dedicated circuit for your electric radiant floor heating system.

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For systems below 12 Amps, a 15 Amp, Non-GFI breaker is fine. For systems 12 to 16 Amps, a 20 Amp, non-GFI breaker is needed. Breaker sizes are noted on the installation plan that ships with many orders.

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For tiny houses, electric radiant floor heating is almost always the better choice over hydronic (water-based) systems. Here's a comparison:

Electric vs. Hydronic for Tiny Houses

Feature Electric (WarmlyYours) Hydronic
Installation complexity Simple — DIY-friendly Complex — boiler, pump, tubing
Upfront cost Low–Moderate High
Space required Minimal (under floor) Significant (mechanical room)
Maintenance None Annual boiler service
Best for small areas ✅ Yes ❌ Not cost-effective

Best WarmlyYours Products for Tiny Houses

  • TempZone™ Flex Rolls — Ideal for open-plan areas; easy to cut and customize around obstacles.
  • TempZone™ Easy Mats — Pre-sized mats for simple rectangular spaces like lofts or bathrooms.
  • TempZone™ Cable — Maximum flexibility for irregular layouts; perfect for uniquely shaped tiny house floors.

All WarmlyYours systems come with a free SmartPlan™ — a custom installation layout drawn by our engineers specifically for your floor plan.

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Keep the power lead factory splice and the cable end seal outside the shower area and at least 1 ft. away from shower openings or other spots normally exposed to water. The control must be located at least 4 ft. from shower openings, where it cannot be exposed to water or touched by someone in the shower.

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A heat loss calculation is essential to ensure your radiant system produces more BTUs than your room loses to the outside environment. This professional assessment guarantees your system has the necessary power to serve as your primary heat source, providing peace of mind during record-breaking cold.

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Temperature affects core resistance - lower temperatures decrease resistance and higher temperatures increase resistance. Another consideration is the test equipment, sometimes switching test units, adjusting the calibration, or allowing for the verified differential may be necessary.

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More output lets the floor make up more of a room’s heat loss. TempZone™ Flex Rolls, Easy Mats and Shower Mats, and TempZone™ Cable at 3-inch spacing, deliver 15 watts per square foot: up to 25% more heating power than the nearest competitor’s systems, and enough for primary or supplemental heat. Cable at 4-inch spacing, about 11 watts per square foot, is for supplemental heat only.

Whether floor heating can be a room’s only heat source depends on that room’s heat loss. An uninsulated concrete slab, for example, absorbs part of the heat, so insulating over it helps. WarmlyYours can calculate your room’s heat loss before you decide.

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Bedroom floor heating is popular because it provides consistent, draft-free warmth that enhances comfort in a space where people often walk barefoot. It eliminates cold spots, operates silently, and is highly energy-efficient. Additionally, radiant heat doesn't circulate dust or allergens, contributing to a healthier sleeping environment compared to forced-air systems.

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A floor sensor measures floor temperature so a compatible thermostat can regulate comfort and enforce the flooring manufacturer’s temperature limit. Some thermostats, including nTrust 2.0, offer a regulator mode without a sensor, but that mode does not measure floor temperature. Use sensor-based temperature control whenever required by the flooring or heating-system instructions.

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Specifications

Electrical

Amps 3.06 A
Cold Lead Wire Gauge 17 AWG
Floor Load 0.74 kW
Ohms 78.3333 Ω
Ohms Per Ft 0.333 Ohm/ft
Thermal Power 0.74 kW
Voltage 240 V
Watts 735 W

Warranty / Certifications

Approvals cULus listed
Warranty 25 Year Warranty
Wet Location Listed US, Canada

Performance

BTU Per Hour 2508 Btu

Product Dimensions

Cable Thickness ⅛″
Cold Lead Length 15′
Coverage 93.02 ft²
Heating Cable Length 235′
Length 235′
Weight 2.85 lbs

Installation

Fixing Strips at 3 inch spacing 60
Fixing Strips at 4 inch spacing 60
Fixing Strips at 5 inch spacing 80
Floor Types At 3 inch spacing: tile, stone, laminate, and carpet*. At 4 inch spacing: hardwood, engineered wood, laminate, carpet*. * Note: carpet installations approved in US only when embedded in self-leveling underlayment

Cabling Specs

Ideal Cable Spacing 3″

Logistics

Package Contents (1) TempZone Floor Heating Cable Twin 240V 3W/ft 235 ft 3.0A (TCT240-3W-235); 1x Floor Heating Sensor (FH-BACKUP-SENSOR)
UNSPSC Code 40101830

Identifiers

SKU TCT240-3W-235
UPC (GTIN-12) 881308031343

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