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TempZone Cable Kit 155 ft (48.4 sqft @ 3.75 in spacing) with nTrust 2.0 Touch Nonprogrammable Thermostat, Uncoupling Membrane, 240V, 3.7/ft, 2.41A

TempZone Cable Kit 155 ft (48.4 sqft @ 3.75 in spacing) with nTrust 2.0 Touch Nonprogrammable Thermostat, Uncoupling Membrane, 240V, 3.7/ft, 2.41A

Part Number: TCT240-KIT-UTN5-MEM-155
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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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Yes, but any furniture that may trap heat, such as pieces with an enclosed bottom, should be avoided. Furniture on legs with a clearance of at least 3" is permissible.

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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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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
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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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In theory, it is possible, if no other options are available. We do not recommend it, but If the thermostat is controlling the floor temperature with a floor sensor, then it can go on an exterior wall. It is important that the floor sensor gets located in an area of the floor not hit by sunshine.

If the thermostat will be controlling the air temperature with the built-in ambient sensor, then it should go on an interior wall.

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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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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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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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Yes, the sensor wires may be trimmed.  Most local code requirements call for 6“-7“ of extra wire from the gang box.

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WarmlyYours recommends running the floor heating system in F (Floor) mode for most homes. This provides the most efficient operation of the floor heating system and the best protection for the floor covering material that has been installed.

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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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The wire spacing in the Prodeso Cable Installation Membrane is 3.75“, or every 3rd peg.

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82°F - 85°F is the most common comfortable warm temperature of the floor.

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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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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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All thermostats are mandated at 42" height for handicap accessibility, most private residences are mounted at 52-60".

Please see this video on how to install a WarmlyYours nSpiration Series thermostat.

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

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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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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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Check these common causes:

  • Trapped heat: a heavy or rubber-backed rug or furniture over the sensor makes it read high. Move the item.
  • Two sensors connected: disconnect the extra sensor and leave one pair of wires on terminals C+D.
  • Changed calibration: this setting should never be changed. Do a factory reset (Installer and User resets).
  • Older system: some older systems, especially those with an OJ Dual/Energystat thermostat, used 12kΩ sensors. Change the installer setting from the default 10kΩ to 12kΩ.

Need more help? Contact WarmlyYours technical support.

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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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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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That is the sound the thermostat makes when the relay is either opened or closed to turn on or off the power to the floor heating elements. See this article for further information.

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Pricing for TempZone Cable heating product typically starts at $6 per sq. ft. ($7 CAD) when installed with Fixing Strips and $9 per sq. ft. ($11 CAD) when installed with our Prodeso Cable Installation Membrane. 

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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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WarmlyYours controllers incorporate built-in Class A GFCI protection for all new floor heating systems.  Class A GFCI provides personnel protection and trips when ground fault current exceeds 5 mA (milliamps).  Class B GFCI protection is pretty much obsolete, but older systems may still require it.  WarmlyYours controllers with built-in Class B GFCI provide equipment and circuit protection and operates when a fault to ground exceeds 15 mA.

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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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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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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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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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Installation

Project Planners

Publications

Technical Information

Sell Sheets

Technical Specifications

Warranties

Register Warranty

Wiring Diagrams

Operation Manuals

Specifications

Electrical (TCT240-3.7W-155)

Amps 2.41 A
Cold Lead Wire Gauge 17 AWG
Floor Load 0.58 kW
Ohms 99.6528 Ω
Ohms Per Ft 0.643 Ohm/ft
Thermal Power 0.58 kW
Voltage 240 V
Watts 578 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-155)

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

Warranty / Certifications (UTN5-4999)

Approvals cULus listed
Ingress Protection (IPxx) Rating IP20
Warranty Limited 3-year warranty and lifetime technical support

Performance (TCT240-3.7W-155)

BTU Per Hour 1972 Btu

Electrical (UTN5-4999)

Battery No battery inside; confirmed by OJ Electronics
Connection 4 wires, double pole, screw terminals
Connection Method Hardwired
Ground Fault Protection GFCI, Class A, 5 mA
Maximum Current 15 A
Maximum Power 1800 W @ 120 V, 3120 W @ 208 V, 3600 W @ 240 V
Power Terminal Wire Gauge 14–12 AWG solid or stranded; 14–13 AWG stranded with ferrule
Signal Terminal Wire Gauge 22–18 AWG solid or stranded; 22–20 AWG stranded with ferrule
Supply 120 VAC, 208 VAC, 240 VAC (50/60Hz)

Product Dimensions (TCT240-3.7W-155)

Cold Lead Length 15′
Coverage 51.7 ft²
Coverage at 3 Inch Spacing 38.8 ft²
Coverage at 3.5 Inch Spacing 45.2 ft²
Coverage at 3.75 Inch Spacing 48.4 ft²
Coverage at 4 Inch Spacing 51.7 ft²
Coverage at 5 Inch Spacing 64.6 ft²
Heating Cable Length 155′
Heating Element Thickness 3/16″
Length 155′
Weight 6.2 lbs

Appearance (TCT240-3.7W-155)

Color Red

Appearance (UTN5-4999)

Color White Acrylic
Display LED Light Through

Product Dimensions (UTN5-4999)

Depth 1.73″
Installed Depth 0.46″
Length 4.98″
Weight 0.6 lbs
Width 3.09″

Installation (TCT240-3.7W-155)

Fixing Strips at 3 inch spacing 40
Fixing Strips at 4 inch spacing 50
Fixing Strips at 5 inch spacing 60
Floor Types Commonly installed beneath tile and stone
Ideal Cable Spacing with Competitor's Membrane 3½″
Ideal Cable Spacing with Fixing Strips 4″
Ideal Cable Spacing with Prodeso Membrane 3¾″

Thermostat (UTN5-4999)

Floor Sensor Compatibility 10k ohms or 12k ohms
Includes Floor Sensor 10k ohms, 15′ lead
Maximum Ambient Temperature Setting 77 °F
Maximum Floor Temperature Setting 104 °F
Minimum Ambient Temperature Setting 32 °F
Minimum Floor Temperature Setting 41 °F

Logistics (TCT240-3.7W-155)

Package Contents (1) TempZone Floor Heating Cable 240V 3.7W/ft 155 ft 2.4A (TCT240-3.7W-155); 1x Floor Heating Sensor (FH-BACKUP-SENSOR)
UNSPSC Code 40101830

Identifiers (TCT240-3.7W-155)

SKU TCT240-3.7W-155
UPC (GTIN-12) 881308049140

Identifiers (UTN5-4999)

SKU UTN5-4999
UPC (GTIN-12) 881308080426

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TempZone Cable Kit 749 ft (234.1 sqft @ 3.75 in spacing) with nTrust 2.0 Touch Nonprogrammable Thermostat, Uncoupling Membrane, 240V, 3.7/ft, 11.65A

TCT240-KIT-UTN5-MEM-864

TempZone Cable Kit 864 ft (270 sqft @ 3.75 in spacing) with nTrust 2.0 Touch Nonprogrammable Thermostat, Uncoupling Membrane, 240V, 3.7/ft, 13.4A

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