TSLM006W36-120

ThermoSlab® Radiant Heating Mat 120V 2.9A 18sqft (6ft x 36in) 21W/sqft

~~$285.50~~ $276.94 Save 3%

Product variants

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

Will you be laying down fresh concrete slab for an indoor space? This is the perfect time to install a slab heating system! ThermoSlab mats add value and comfort to your project without putting strain on your schedule. Simply roll out mats with pre-spaced cables eliminating time required for manual uniform placement. Enjoy the luxury of heated flooring in any space with concrete slab such as your garage, basement, or sunroom. Easily install any flooring type on your slab with an embedded electric heating system that provides gentle warmth throughout your home. Lower your heating costs by charging your slab with radiant heat during off-peak electricity pricing and enjoy steady heat throughout the day. Speak to our knowledgeable U.S. based technical support team to guide you from the initial planning stage through project completion.

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.

Thermosoft

Cozy, Affordable and Reliable Electric Radiant Heating—Inside and Out

At ThermoSoft, electric radiant heating is about more than just warmth—it’s about comfort, safety, and peace of mind throughout your home. Indoors, our systems integrate seamlessly wherever you need them—bathrooms, kitchens, basements, or your entire living space. Outdoors, we empower you to be fully in control, keeping driveways and walkways clear, roofs and gutters snow and ice-free, and exposed pipes protected. Across every corner of your property, ThermoSoft’s electric radiant heating delivers consistent, energy-efficient performance—right where it matters most.

For over 30 years, homeowners have trusted ThermoSoft for safe, dependable indoor and outdoor heating solutions. With patented technologies like FiberThermics®, our systems offer unmatched performance, proven durability, minimal EMF emissions, and fast, even heat distribution on demand.

As a US based manufacturer proudly based in Vernon Hills, Illinois, our systems ensure faster heat delivery, easier maintenance, and long-term reliability. From floor heating under any floor type— including tile, laminate, vinyl, and wood—to deicing and snow-melting systems for concrete, asphalt, and pavers, as well as roof, gutter, and water pipe protection solutions, we provide systems that are built to last and backed by expert support.

Join the millions of homeowners who trust ThermoSoft to bring warmth to every step, inside and out.

Real People, Real Support

Behind every system is a US-Based team that listens, solves, and supports—because great products deserve even better service backed by the highest level of quality control possible.

Our Mission is Your Comfort

We’re here to make your home feel amazing. Every system we build is designed to deliver joy, warmth, and lasting satisfaction while also offering an unsurpassed best-in-class safety record.

Unmatched Value, USA Based Manufacturer

Using only premium materials, patented technology, and superior engineering—all at a price that makes luxury heating and accessible.

Innovation You Can Trust

We don’t follow trends—we set them. With proprietary tech like FiberThermics®, our systems have been installed and delivering reliable electric radiant heat to homeowners for 30 years.