Snow Melt Repair Kit (SPSM-01)
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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.
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.
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".
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.
The most common spacing for snow melting systems is 3“ from wire to wire. However, we can design snow melting systems based on your local climate and weather expectations that might have different cable spacings to ensure the most efficient system possible. We also offer snow melting mats with 3" and 4" spacing.
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).
A 2 pole single-phase 240V circuit works by continuously monitoring the current flowing through both hot wires of the circuit. If it detects even a slight imbalance between the current on each hot wire (indicating a ground fault), it will quickly trip, cutting off power to the circuit. Essentially, it compares each leg of the 240V circuit and trips if they are not precisely equal.
To calculate the system's approximate operating costs, multiply the total kilowatts of the system by your local electricity rate. Let's use the example of a 350 sq. ft. concrete patio (residential application), with 240 VAC, at the U.S. national average rate of $0.17 per kWh.
Total Watts: multiply area in sq. ft. × 50 Watts
350 × 50 = 17,500 Total Watts
Kilowatts: (the unit by which we purchase electricity) divide Total Watts by 1,000
17,500 Watts ÷ 1,000 = 17.5 kW
Cost per Hour: multiply kW by your local kWh rate
17.5 kW × $0.17/kWh = $2.98 per hour of operation
Hours of Operation: using a typical 6-hour snowfall as an example
$2.98 × 6 hours = $17.85 for that storm
All of this will vary based on your local electricity rate and "after-run time." After-run time is the period the system remains on after snow stops falling to fully dry the slab and prevent refreezing — typically 1–3 additional hours. Rates vary widely by state; check your utility bill for your actual kWh rate. Use our Operating Cost Calculator to get a personalized estimate based on your zip code.
For driveways with a grade (slope) of 5% or more, WarmlyYours recommends full-coverage snow melting rather than tire-track heating. Here's why grade matters:
- 0–4% grade (nearly flat): Tire-track heating is a cost-effective option. The unheated areas between tracks are a minor inconvenience.
- 5–8% grade (moderate slope): Full coverage is strongly recommended. Unheated areas between tire tracks become primary slip hazards for pedestrians stepping out of vehicles.
- 8%+ grade (steep): Full coverage is essential. Gravity significantly increases the risk of vehicle sliding and pedestrian falls on any unheated surface.
On a slope, a vehicle that makes it up a heated tire track can still slide sideways if the surrounding surface is icy. Full coverage eliminates the entire hazard — not just the vehicle path. The additional material cost is approximately 35% more than tire-track heating, but it is the only option that truly eliminates the risk on a steep grade.