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Snow Melt PowerMat Frequently Asked Questions

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Frequently Asked Questions

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Power requirements are measured in Amps and based on three factors: the watts per sq. ft. of the snow melting cable or mat, the area powered and the voltage used for the application. Our PowerMat product is rated at approximately 50 watts per sq. ft. (with 3" cable spacing), so that is a constant factor. Most snowmelt projects are powered with 240V AC – not all, but most. The one factor that is always variable is the area to be heated/powered. That is based on your project. For a point of reference, let's use the example of a 350 sq. ft. concrete patio.

The formula is (50 W/sq. ft. x area of 350 sq. ft.) / V (240V) = Amps, so 17,500 / 240V = 72.9 Amps

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That depends on a number of variables (like the temperature outside) but generally speaking these snow melting systems are designed to melt 1" - 3" of snow per hour. Anything above 3" per hour is typically considered blizzard conditions. 

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Never cut the heating cable. A heating cable will not work if it has been cut. If the heating cable is too long, call WarmlyYours to consult with a technician who will guide you in utilizing the additional length of cable.

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When installing outdoor WarmlyYours snow melting cables for your driveway, patio, walkway, terrace, stairs, ramp, etc. - NEVER cross, overlap, or allow the heating cables to touch each other. Doing so will quickly cause a circuit failure due to excessive heat build up. Always follow the installation instructions and/or design layout plan to ensure the cable is installed with the correct spacing required for proper operation.

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Our systems can handle low temperatures, but many controls come equipped with a Low-Temperature Lockout Feature. This feature prevents the system from running in very low temperatures. At very low temperatures it can become difficult for the system to effectively melt the snow. It is however possible to turn off this feature should you need the system to keep running during such low 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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We suggest using cable to heat stairs as it is easier to route between the separate stairs. 

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Yes. The manufacturer's splice that connects the heating element to the cold lead should be entirely embedded in a noncombustible material (like asphalt, concrete, or mortar) within the outdoor surface that is being heated. 

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To ensure optimal performance, snow melting heating elements should be installed so that they are consistently 2"-3" from the finished surface. For installations using pavers, the maximum thickness for pavers installed over heating elements is 2.5". 

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GFEP is the National Electric Code (NEC) required protection for fixed outdoor deicing and snow-melting equipment, which may be accomplished by using circuit breakers equipped with ground-fault equipment protection (GFEP) of 30 mA. It is important to understand that this required equipment protection is NOT the same as a 5 mA GFCI used for personal protection.

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The electrician may shorten the cold lead wires during the installation. Any cold lead wire extensions/splices must be made in a junction box in accordance with the installation instructions, and must comply with all national and local electrical codes.

Never cut the heating cable.

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All of our automatic controllers have a Hold-on time feature after the initial warming up of the snow melt system. This feature ensures that all the snow is melted from the surface, and also that the system continues to operate and evaporate the surface water without it refreezing.

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Pavers can be removed and reinstalled for a retrofit application of our snow melt system. Tire tracks are not typically recommended for paver surfaces, so any retrofit application would most likely need to be full coverage. In this case, it should be treated like a brand new installation, just with existing pavers.

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The heating elements for a snow melting system typically will start at $9 ($11 CAD) per sq. ft. for Snow Melting Cables and $11 ($14 CAD) per sq. ft. for Snow Melting Mats. However, you'll also want to keep in mind the cost of a control, and if required, sensor/s for your snow melting system, which will add to the cost. Use our free Quote Builder to get an idea of how much a system would cost for your project. 

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When the design requirement's amp draw exceeds the selected controller's capacity.

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If a cable is damaged during installation, recheck the system for continuity and confirm the integrity of the insulation with a megohmmeter, or "megger" tester, referring to the installation and testing instructions. If the cable fails any of these tests, take the following actions: clear a 3 foot square working area around the damaged section of cable, and record the cable part number from the UL tag and the location where you purchased the product. Call WarmlyYours with the above information. WarmlyYours will provide further assistance and supply a splice kit suitable for repairing the particular cable.

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We recommend that the layer of landscaping rock be no deeper than 2.5". If the snow melting heating elements are embedded any deeper than that, then the system may not yield satisfactory results.

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The layer of noncombustible material needed below snow melting heating elements must be at least 2" deep. 

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Each heating cable comes with a factory installed cold lead wire that must be routed through the rigid metal 3/4" conduit to a outdoor rated junction box where a simple wire nut connection can be made for the electrical hook-up.

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Yes, as long as the paver isn't resting on exposed cable. The cable has to be embedded according to the installation cross section drawing.

Cover to an uncompacted depth of 1.5” (38mm), leveled to grade. A compactor that's applicable to the thickness and application can be used to compact the sand. The paver installer(s) must take care not to walk on the hot-cold factory splice and to avoid damaging the Heating Cables with shovels or rakes. At no time shall the compactor directly contact the wire.

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Yes, WarmlyYours Snow Melting Heating System can be installed with quartzite stones. Start with 4” to 8” (102mm to 203mm) of crushed rock aggregate base. Rebar or wire mesh should be staked on top of this base and then heating cables or mats will be tied to this mesh with plastic zip ties. Heating system needs to be covered with 1” to 1.5” (51mm to 76mm) of finished mortar or sand. Stone Pavers will be installed on top but must NOT be any thicker than 2.5” (63.5mm). See cross-section in the documents section and in the manual.

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The snowmelt cables/mats can withstand direct contact with asphalt temperatures of up to 464°F (240°C).

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Always confirm the power requirements with the electrician. Large snow melting systems usually require a new electrical panel or electrical service. Contact WarmlyYours for a quotation, indicating the actual power capacity available, and to obtain recommendations for reducing the power consumption. For example, opting for tire track coverage rather than installing the snow melting system over the entire driveway can dramatically reduce power requirements.

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No, additional wiring is supplied by the electrician.

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A properly designed and installed system will handle most snow melting demands. Some snow events may have a very rapid snow fall rate, and some may not. No 2 events are ever exactly the same. Our system typically can melt 1" - 3“ of snow per hour, on average. However, it is important to understand that a system may not melt snow at very cold temperatures. This is simply because the system cannot generate enough BTUs to overcome the heat loss generated by very low temperatures.
In order to estimate cost of operation, the WarmlyYours Electric Snow Melting Operating Cost Calculator is a useful tool that can help illustrate what it would cost to operate the system.

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Once you've decided what type of heating system (manual vs. automatic), you'll need to choose a control, which may or may not utilize a sensor. You may need a relay panel(s) depending on the size of the system, and a snow melt plaque which is required by the National Electric Code. Junction box(es) may be optional depending on the distance of heating cable from the indoor power location.

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It depends on how the system is intended to operate. If the expectation is manual operation (ex. WiFi or Timer Control), then no sensors are required. If the expectation is automatic operation, then the system will require at least one snow sensor.

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No. Each snow melt mat comes with a 20‘ cold lead.

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The US National Electrical Code does not permit radiant heating cables embedded in or below a deck within 20 feet of the inside wall of a permanently installed pool, spa or hot tub (NEC 680.27(C)(3); 680.42 and 680.43 apply it to spas and hot tubs). The NEC applies as adopted and amended by your jurisdiction, so check with your local Authority Having Jurisdiction.

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Ground fault equipment protection (GFEP) is intended to provide protection for equipment against damaging line-to-ground currents by disconnecting all ungrounded conductors of the faulted circuit.

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120, 208, 240, 277 voltages.

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No, chicken wire is too flimsy. A rigid framework without sharp edges, such as rebar or wire mesh, needs to be used to ensure that the embedded heating system is the proper distance from the finished surface. We recommend that the heating system is secured to the rigid framework with plastic zip-ties. 

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No, a sensor is not required with the snow melt system. However, certain automatic controllers require a temperature/moisture sensor to sense atmospheric conditions and may also require an in-slab, high temperature limit sensor to be installed (notably, asphalt installations).

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Yes. The NEC requires 2“ minimum of non-combustible material below, and 1.5“ minimum of non-combustible material above the heating cable.

The drawback is whether or not the pervious concrete will fail under load, thereby damaging the heating cable and voiding warranty. The cable should be attached to rebar in this case to insure the strongest support.

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The best time to install an asphalt driveway is generally from spring to fall. The contractor has more time to work with asphalt at warmer temperatures of 50°F / 10°C and above. The warmer the better. The contractor has less time to work with asphalt at colder temperatures and lesser depths. For example, at 40°F / 4°C, a contractor has only 25 minutes to work with a 2" thick asphalt installation.

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Snow melting mats feature heating cables pre-spaced on a mesh backing for fast, consistent installation in large, straight areas like driveways. Loose cables offer maximum flexibility for custom shapes, stairs, or tight curves. Both provide the same heating output, but mats reduce labor time while cables handle complex layouts.

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Never cut or shorten a snow melting cable, whether it is loose or attached to a mat. Altering its length damages the cable and can make it overheat. Only the non-heating cold lead can be cut or extended, with a splice inside an accessible weatherproof junction box.

To fit a mat to your pavers, cut the mat’s mesh, never the cable, and turn it. For shapes a mat can’t follow, detach the cable from the mesh and lay it as loose cable, or use snow melting cable. Lay cable at the spacing on your SmartPlan™: 3 inches in most locations, wider only where WarmlyYours designs it for your climate.

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The right choice depends on your layout, timeline, and how custom the space is:

  • Choose Snow Melt Mats when you want faster installation and consistent, evenly spaced heat in standard shapes (straight walkways, rectangular landings, simple patios). Mats are ideal when you’re prioritizing speed, simplicity, and uniform coverage.
    Link: Snow Melt Mats
  • Choose Snow Melt Cables when your paver area has curves, tight turns, odd shapes, or lots of obstacles (posts, drains, steps, landscaping cutouts). Cables give you maximum design flexibility so you can match the heating layout to the exact paver pattern and footprint.
    Link: Snow Melt Cables

Pro tip (especially for pavers): Before deciding, confirm your surface type and whether it’s a new install or a retrofit, then request a free SmartPlan so you get a custom layout, product recommendation, and electrical specs based on your exact dimensions.
Link: Free Snow Melting Installation Plan (SmartPlan)

Sources: https://www.warmlyyours.com/en-US/posts/blog-post-how-to-plan-for-a-snow-melting-system-8-things-to-know-before-you-get-a-quote?referral_code=VN6G5K

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Operating cost depends on the heated area, installed wattage, your electricity rate and how many hours the system is energized. For example, 100 sq ft at 50 W/sq ft draws 5 kW (100 × 50 ÷ 1,000). At an illustrative $0.20/kWh, that is $1.00 per energized hour, or $6.00 for six energized hours. This is an example, not a typical bill. What changes your total:

  • Heated area and coverage (full area or tire tracks)
  • Installed watts per square foot
  • Your local electricity rate
  • Runtime, including preheating, snowfall and the controller’s drying cycle

Enter your own numbers in our snow melting cost calculator.

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Electric snow melting systems require virtually no maintenance. There are no fluids to check, no pump to service, and no annual inspection required. The one recommended task is a quick ohmmeter resistance test each fall — about five minutes with a basic multimeter — to confirm the cable is intact before winter. If the reading falls within ±15% of the spec in your installation manual, the system is in good health.

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WarmlyYours snow melting systems are backed by our industry-leading 25-year product warranty, one of the longest in the radiant heating industry.

What's Covered:

  • Heating cables and mats – 25 years against manufacturing defects
  • Control systems and sensors – Manufacturer warranties (typically 3-5 years)
  • Free replacement of defective components during warranty period

Why Our Warranty Matters:

  • Proven reliability – Over 25 years of manufacturing experience
  • Rigorous testing – All systems tested before shipping
  • Installation support – 24/7 tech support during installation to prevent issues
  • Peace of mind – Your investment is protected for decades

Beyond the Warranty:

Even after your warranty period, our support team remains available to help with:

  • Troubleshooting and diagnostics
  • System expansions or modifications
  • Replacement parts and accessories
  • Technical guidance for repairs

Your SmartPlan™ includes warranty documentation and testing logs to ensure your system is properly registered and protected from day one.

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