TempZone Cable Kit 115 ft. (35 sq.ft. @ 3.75 in spacing) with nTrust Nonprogrammable Thermostat, Uncoupling Membrane, 240V, 3.7/ft, 1.83A
Part Number: TCT240-KIT-ON-MEM-115
This support page provides publications, manuals, specifications, videos, support articles, and common support questions
This support page provides publications, manuals, specifications, videos, support articles, and common support questions
Support Questions
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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.
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
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.
Waterproofing for the room is in the layer above the floor heating system. The layers for waterproofing this type of floor are:
- subfloor
- thinset
- uncoupling membrane
- tempzone heating cable
- waterproofing tape for seams and corners
- thinset or self leveling cement
- tile floor
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.
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.
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.
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.
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.
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.
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
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.
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.
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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Specifications
Electrical (TCT240-3.7W-115)
| Amps | 1.83 A |
| Cold Lead Wire Gauge | 17 AWG |
| Floor Load | 0.44 kW |
| Ohms | 131.4815 Ω |
| Ohms Per Ft | 1.143 Ohm/ft |
| Thermal Power | 0.44 kW |
| Voltage | 240 V |
| Watts | 438 W |
| Watts Per Sq. Ft at 3.75 Inch Spacing | Up to 12 |
| Watts Per Sq. Ft. | 9 to 15 |
| Watts Per Sq. Ft. at 3 Inch Spacing | Up to 15 |
| Watts Per Sq. Ft. at 4 Inch Spacing | Up to 11 |
| Watts Per Sq. Ft. at 5 Inch Spacing | Up to 9 |
Warranty / Certifications (TCT240-3.7W-115)
| Approvals | cULus listed |
| Warranty | 25 Year Warranty |
| Wet Location Listed | US, Canada |
Performance (TCT240-3.7W-115)
| BTU Per Hour | 1495 Btu |
Product Dimensions (TCT240-3.7W-115)
| Cold Lead Length | 15′ |
| Coverage | 38.3 ft² |
| Coverage at 3 Inch Spacing | 28.8 ft² |
| Coverage at 3.5 Inch Spacing | 33.5 ft² |
| Coverage at 3.75 Inch Spacing | 35.9 ft² |
| Coverage at 4 Inch Spacing | 38.3 ft² |
| Coverage at 5 Inch Spacing | 47.9 ft² |
| Heating Element Thickness | 3/16″ |
| Length | 115′ |
| Weight | 4.4 lbs |
Appearance (TCT240-3.7W-115)
| Color | Red |
Installation (TCT240-3.7W-115)
Logistics (TCT240-3.7W-115)
| Package Contents | (1) TempZone Floor Heating Cable 240V 3.7W/ft 115 ft 1.8A (TCT240-3.7W-115); 1x Floor Heating Sensor (FH-BACKUP-SENSOR) |
| UNSPSC Code | 40101830 |
Identifiers (TCT240-3.7W-115)
| SKU | TCT240-3.7W-115 |
| UPC (GTIN-12) | 881308049133 |
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