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ThermoSlab® Heating Cable

The most economical and versatile solution for new construction, ThermoSlab cable is the premium choice for foundational heat. Not only does it allow for long-lasting heat storage, the powerful ThermoSlab Cable permits any additional floor covering to go over it.
Collection of full system for Electric Radiant Heating Cable for concrete slabs and floors
Electric Radiant Heating Cable for concrete slabs and floors
Multiple sizes of Electric Radiant Heating Cable for concrete slabs and floors
Electric Radiant Heating Cable for concrete slabs and floors being installed
Electric Radiant Heating Cable for concrete slabs and floors shown under concrete
Collection of full system for Electric Radiant Heating Cable for concrete slabs and floors
Electric Radiant Heating Cable for concrete slabs and floors
Multiple sizes of Electric Radiant Heating Cable for concrete slabs and floors
Electric Radiant Heating Cable for concrete slabs and floors being installed
Electric Radiant Heating Cable for concrete slabs and floors shown under concrete
  • Electric In-Floor Heating for Concrete
  • Easily fits any space with loose cable designed for concrete installation
  • Provides between 12-18W/ft² of heat output depending on cable spacing
  • Factory attached 20 ft. cold lead wire for a flexible connection to thermostat
  • Systems compatible with 120/208/240 supply voltages
  • Complete system includes heating cables, in-floor sensors, and wall-mounted thermostat

Installation Guide

Warranty

What is ThermoSlab?
ThermoSlab is a system of rugged heating cables tough enough to be installed directly in a new concrete foundation, or in the sand beneath a slab. ThermoSlab gives you the most permanent access to radiant heat as it survives any remodel, and even allows heat storage due to concrete slowly releasing heat over a longer period compared with typical floor coverings.
Is this a safe product to put in my home or business? What about EMF?
Yes. All our floor heating solutions endure rigorous development and quality control testing to ensure that your floor heating system is reliable and safe. Due to the shielding and dual cable design used in ThermoSoft products, our radiant heat systems add virtually zero EMF.
Can I use ThermoSlab with my floor material?
ThermoSlab is installed directly in your foundation slab concrete, so any floor covering that can be installed over a concrete slab can be installed over ThermoSlab.
How do I install ThermoSlab? How do the cables get connected?
ThermoSlab is arranged before pouring your concrete slab and can be attached to mesh or rebar if you are using those materials to make arrangement of the cables easier. Make sure to read the full Installation Manual before beginning! ThermoSlab cables are wired to a floor heating thermostat in parallel. The number of cables and layout of the room will affect the exact process of how to wire the heating cables together. Please see the Installation Manual for explicit directions, or contact our in house experts for assistance.
Will this add height to my floor?
No, the ThermoSlab cable will be embedded in the concrete and will not add height in any way.
How deep does the concrete need to be for ThermoSlab?
ThermoSlab can be installed in concrete that is 2 inches or thicker.
What if I’m not pouring a full 2 inches of new concrete?
If you are pouring concrete at less than 2 inches, ThermoTile Mats will be a better fit. Not sure how to proceed? Give us a call and our experts will gladly help!
Can I combine more than one ThermoSlab cable to fit a space?
Many projects involve using more than one cable, but this means that multiple cables are wired in parallel to the thermostat. The thing to remember is that you are not daisy-chaining or extending the heating cables, but rather the cables are working together to cover the appropriate square footage by connecting them in parallel to the floor heating thermostat.
Can I cut or shorten the heating cable?
No. We do not warranty the cable when the heating element has been cut. Call us in advance and our floor heating experts will be able to match your project with the correct length of heating cable and advise on how to properly lay it out.
Can I shorten the lead wires?
Yes. The lead wires, also known as cold leads because they do not produce heat, can be cut, shortened, or spliced with additional cold lead cable to lengthen them.
What do I do with areas that are not heated?
Floor covering is installed as normal over the heated and non heated areas of the slab.
Can ThermoSlab cable really stand up to pouring a new slab?
Yes! ThermoSlab is a rugged and durable cable that we recommend specifically for this type of application. We also highly recommend using one of our InstAlarm Monitors during installation. The InstAlarm Monitor is a device that connects to the lead wires and will produce a loud sound if there is damage to the heating cable.
How many watts per square foot does ThermoSlab output?
This figure can vary if the cable spacing deviates from the 5 inches on center spacing, but the standard output of ThermoSlab is about 14 watts per square foot.
How much will it cost to run this system?
The cost to operate is a complicated question to answer, as electrical rates vary by area, your home's insulation, and even by time of day. Additionally, a cost-to-operate is further complicated because the money spent on your radiant heat can result in a net savings on total utilities cost due to reduced use of your traditional HVAC, which is added to by the fact that you will spend less on HVAC system maintenance by relying on electric radiant heat.
How hot does ThermoSlab get?
Sometimes, we like to answer a question with a follow-up question. Usually, we are asked about “how hot” a system gets for a couple of reasons, so it is important to understand whyo you ask? Are you concerned about providing enough heat to adequately warm your space? If so, a properly installed ThermoSlab can provide about 10-15 degrees Fahrenheit of temperature difference above the ambient temperature of the room. In practice, this is more than enough, even in extremely cold climates. We are positive that you will be entirely satisfied with the heat produced by ThermoSlab. Are you concerned about applying too much heat to your chosen floor material? If so, fear not! ThermoSlab is designed to apply heat gently and evenly, due to the nature of the heating elements and the cable spacing pattern that it features. Additionally, ThermoSlab sits in concrete, which allows the heat to disperse warmth gradually and evenly. Depending on the floor covering you use, you may want to control your heat a little differently. Certain floor coverings are more temperature and temperature-change sensitive. Call us to have an our in-house experts go over some of these radiant heat “best practices.” Lastly, we highly recommend choosing a thermostat that includes a temperature limiter if this is one of your concerns!
How long will ThermoSlab last? How long is the warranty?
ThermoSlab has no moving parts and therefore it does not require regular maintenance once installed correctly and if left undisturbed (remember your radiant system is down there when planning a remodel!). The heating cables are warrantied for 10 years, but after multiple decades on the market, we have yet to see a system fail due to old age. The thermostats that we offer are warrantied for 3 years because we only use thermostats with GFCI protection which, per national electric code, is recommended to be replaced every 3 years. Replacing a thermostat is simple, easy, and inexpensive.
I’m still confused.
Then call us, email us, or message us through our website! Our in house customer sevice experts will be happy to assist you.
1 Heating Cable
2 Thermostat
3 Accessories
4 Tools

Combine cables as needed to fit open walkable space, avoiding areas covered by cabinets, vanities or other permanent fixtures. The heating cable cannot be shortened, so avoid over-filling. Each cable will connect to the thermostat, so larger cables will reduce required connections. At 5" spacing on a sole thermostat, 120V cables cover up to 122 ft²; 240V cables cover up to 244 ft². DO NOT MIX VOLTAGES. Contact us for project assistance or help finding a local dealer/installer.

Choose Rated Voltage:
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Heating Cable
2 Thermostat
3 Accessories
4 Tools
Thermostat

A floor heating thermostat is necessary to control your radiant heat system. Most of our floor heating thermostats are dual-voltage and include a 5ma GFCI, unlike models from online warehouse retailers. A thermostat is capable of a 15-Amp load; adding a power module or relay will increase system load capacity. Each includes a floor sensor, but a backup is recommended. Select 1 thermostat for each zone desired. Contact an expert for guidance.

Choose Setting

Programmable

Manual

  • OJ Wi-Fi Enabled Touch Screen Thermostat
    OJ Wi-Fi Enabled Touch Screen Thermostat
    UWG4-4999
    $294.95 View
  • OJ WiFi LED Touch Thermostat
    OJ WiFi LED Touch Thermostat
    UWG5-4999
    $229.95 View
  • OJ Touch Screen Thermostat
    OJ Touch Screen Thermostat
    UDG4-4999
    $207.20 View
  • OJ Touch Screen Thermostat, Black
    OJ Touch Screen Thermostat, Black
    UDG4-4999-N4
    $207.20 View
  • Aube Dual Voltage Programmable Thermostat With GFCI
    Aube Dual Voltage Programmable Thermostat With GFCI
    TH115-AF-GA/U
    $179.99 View
  • OJ Advanced Programmable Thermostat
    OJ Advanced Programmable Thermostat
    UDG-4999
    $160.95 View
  • Aube 120/240V Manual Thermostat
    Aube 120/240V Manual Thermostat
    TH114-AF-GA/U
    $159.99 View
  • OJ Touch Thermostat with built-in GFCI
    OJ Touch Thermostat with built-in GFCI
    UTN5-4999
    $159.95 View

    • Choose Other Components:

  • Backup Floor Sensor - 15Ft.
    Backup Floor Sensor - 15Ft.
    AC112-01/U
    $19.95 View
  • Thermostat Installation Conduit Kit
    Thermostat Installation Conduit Kit
    IK-CON
    $44.95 View
    • Heating Cable
    Thermostat
    3 Accessories
    4 Tools
    Choose Accessories
  • InstAlarm Circuit Testing Floor Monitor
    InstAlarm Circuit Testing Floor Monitor
    INSTALRM
    $24.95 View
  • Digital Multimeter
    Digital Multimeter
    MULTIMTR
    $19.95 View
  • Power module with built-in GFCI
    Power module with built-in GFCI
    USG-4000
    $109.95 View
    • Heating Cable
    Thermostat
    Accessories
    4 Tools
    Choose Kits and Tools
  • Basic Install Kit
    Basic Install Kit
    IK-TA
    $29.95 View
  • Advanced Install Kit
    Advanced Install Kit
    IK-TAM
    $44.95 View
  • Deluxe Install Kit
    Deluxe Install Kit
    IK-TAMK
    $55.95 View
  • 3/8" Notch Trowel
    3/8" Notch Trowel
    TRWL3838
    $12.95 View
  • 1/2" Notch Trowel
    1/2" Notch Trowel
    TRWL3812
    $14.89 View
  • Ultra-Light Kneepad
    Ultra-Light Kneepad
    KNPD-318
    $5.95 View

    • This is the last step

    See your cart
    • Electric In-Floor Heating for Concrete
    • Easily fits any space with loose cable designed for concrete installation
    • Provides between 12-18W/ft² of heat output depending on cable spacing
    • Factory attached 20 ft. cold lead wire for a flexible connection to thermostat
    • Systems compatible with 120/208/240 supply voltages
    • Complete system includes heating cables, in-floor sensors, and wall-mounted thermostat

    Installation Guide

    Warranty

    What is ThermoSlab?
    ThermoSlab is a system of rugged heating cables tough enough to be installed directly in a new concrete foundation, or in the sand beneath a slab. ThermoSlab gives you the most permanent access to radiant heat as it survives any remodel, and even allows heat storage due to concrete slowly releasing heat over a longer period compared with typical floor coverings.
    Is this a safe product to put in my home or business? What about EMF?
    Yes. All our floor heating solutions endure rigorous development and quality control testing to ensure that your floor heating system is reliable and safe. Due to the shielding and dual cable design used in ThermoSoft products, our radiant heat systems add virtually zero EMF.
    Can I use ThermoSlab with my floor material?
    ThermoSlab is installed directly in your foundation slab concrete, so any floor covering that can be installed over a concrete slab can be installed over ThermoSlab.
    How do I install ThermoSlab? How do the cables get connected?
    ThermoSlab is arranged before pouring your concrete slab and can be attached to mesh or rebar if you are using those materials to make arrangement of the cables easier. Make sure to read the full Installation Manual before beginning! ThermoSlab cables are wired to a floor heating thermostat in parallel. The number of cables and layout of the room will affect the exact process of how to wire the heating cables together. Please see the Installation Manual for explicit directions, or contact our in house experts for assistance.
    Will this add height to my floor?
    No, the ThermoSlab cable will be embedded in the concrete and will not add height in any way.
    How deep does the concrete need to be for ThermoSlab?
    ThermoSlab can be installed in concrete that is 2 inches or thicker.
    What if I’m not pouring a full 2 inches of new concrete?
    If you are pouring concrete at less than 2 inches, ThermoTile Mats will be a better fit. Not sure how to proceed? Give us a call and our experts will gladly help!
    Can I combine more than one ThermoSlab cable to fit a space?
    Many projects involve using more than one cable, but this means that multiple cables are wired in parallel to the thermostat. The thing to remember is that you are not daisy-chaining or extending the heating cables, but rather the cables are working together to cover the appropriate square footage by connecting them in parallel to the floor heating thermostat.
    Can I cut or shorten the heating cable?
    No. We do not warranty the cable when the heating element has been cut. Call us in advance and our floor heating experts will be able to match your project with the correct length of heating cable and advise on how to properly lay it out.
    Can I shorten the lead wires?
    Yes. The lead wires, also known as cold leads because they do not produce heat, can be cut, shortened, or spliced with additional cold lead cable to lengthen them.
    What do I do with areas that are not heated?
    Floor covering is installed as normal over the heated and non heated areas of the slab.
    Can ThermoSlab cable really stand up to pouring a new slab?
    Yes! ThermoSlab is a rugged and durable cable that we recommend specifically for this type of application. We also highly recommend using one of our InstAlarm Monitors during installation. The InstAlarm Monitor is a device that connects to the lead wires and will produce a loud sound if there is damage to the heating cable.
    How many watts per square foot does ThermoSlab output?
    This figure can vary if the cable spacing deviates from the 5 inches on center spacing, but the standard output of ThermoSlab is about 14 watts per square foot.
    How much will it cost to run this system?
    The cost to operate is a complicated question to answer, as electrical rates vary by area, your home's insulation, and even by time of day. Additionally, a cost-to-operate is further complicated because the money spent on your radiant heat can result in a net savings on total utilities cost due to reduced use of your traditional HVAC, which is added to by the fact that you will spend less on HVAC system maintenance by relying on electric radiant heat.
    How hot does ThermoSlab get?
    Sometimes, we like to answer a question with a follow-up question. Usually, we are asked about “how hot” a system gets for a couple of reasons, so it is important to understand whyo you ask? Are you concerned about providing enough heat to adequately warm your space? If so, a properly installed ThermoSlab can provide about 10-15 degrees Fahrenheit of temperature difference above the ambient temperature of the room. In practice, this is more than enough, even in extremely cold climates. We are positive that you will be entirely satisfied with the heat produced by ThermoSlab. Are you concerned about applying too much heat to your chosen floor material? If so, fear not! ThermoSlab is designed to apply heat gently and evenly, due to the nature of the heating elements and the cable spacing pattern that it features. Additionally, ThermoSlab sits in concrete, which allows the heat to disperse warmth gradually and evenly. Depending on the floor covering you use, you may want to control your heat a little differently. Certain floor coverings are more temperature and temperature-change sensitive. Call us to have an our in-house experts go over some of these radiant heat “best practices.” Lastly, we highly recommend choosing a thermostat that includes a temperature limiter if this is one of your concerns!
    How long will ThermoSlab last? How long is the warranty?
    ThermoSlab has no moving parts and therefore it does not require regular maintenance once installed correctly and if left undisturbed (remember your radiant system is down there when planning a remodel!). The heating cables are warrantied for 10 years, but after multiple decades on the market, we have yet to see a system fail due to old age. The thermostats that we offer are warrantied for 3 years because we only use thermostats with GFCI protection which, per national electric code, is recommended to be replaced every 3 years. Replacing a thermostat is simple, easy, and inexpensive.
    I’m still confused.
    Then call us, email us, or message us through our website! Our in house customer sevice experts will be happy to assist you.