Slab Heating Cable 120V, 57 ft., 2.8A
This support page provides publications, manuals, specifications, videos, support articles, and common support questions
Common Support Questions
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 Slab Heat system will draw less than 6 amps. If you have a larger area over 180 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.
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.
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.
Yes. In addition to TempZone™ and Slab Heat, we also have specially sized Shower and Bench mats designed specifically for shower installation. They are all wet location listed for radiant floor heating in a shower.
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.
The requirements are determined as follows: plan on 20 watts per square foot (at 3" spacing) without a floor covering; or 15 watts per square foot (at 5" spacing, cable only) with a floor covering. To calculate approximate power requirements, multiply the square feet by either 20 or 15 (per the above), and then divide by the voltage (120V or 240V) to arrive at Amps.
Reflective insulation is not effective with conductive heating, which is how embedded floor heating and snow-melting systems transfer heat. To be effective, the reflective insulation surface needs to face an air space (air gap), which allows the reflected heat to be redirected.
An effective solution considers the insulating material's R-Value. This is the rating of a material's insulating properties. The "R" stands for "resistance" and refers to the material's resistance to heat flow, or temperature conduction.
You can control your slab heating system with any WarmlyYours nSpiration Series thermostat. Depending on the size of your project, you may also need to add a relay or nJoin power module.
The layers for the full installation are as follows:
- Bottom: 8-10" of compressed crushed rock aggregate (may already exist)
- 2" polystyrene insulation
- 2-3" layer of concrete
- Rebar and/or reinforcing mesh and attach the cable or mat
- Top: Pour a 2-3" layer of concrete as the final flooring surface
Call tech support at +1 (800) 875-5285 to customize this to your unique application.
Publications and Manuals
Specifications
Electrical
| Amps | 2.75 A |
| Floor Load | 0.33 kW |
| Ohms | 43.64 Ω |
| Thermal Power | 0.33 kW |
| Voltage | 120 V |
| Watts | 330 W |
| Watts Per Sq. Ft. | 15 to 20 |
| Watts Per Sq. Ft. at 3 Inch Spacing | Up to 20 |
| Watts Per Sq. Ft. at 5 Inch Spacing | Up to 15 |
Warranty / Certifications
| Approvals | cCSAus Listed |
| Warranty | 10 Year Warranty |
Performance
| BTU Per Hour | 1126 Btu |
Product Dimensions
| Cold Lead Length | 20′ |
| Coverage at 3 Inch Spacing | 14.3 ft² |
| Coverage at 4 Inch Spacing | 19 ft² |
| Coverage at 5 Inch Spacing | 23.8 ft² |
| Heating Element Thickness | 1/4″ |
| Length | 57′ |
| Weight | 4.7 lbs |
| Width | 0.75″ |
Appearance
| Color | Blue |
Installation
| Floor Types | Cement, Tile, Marble, Stone, Vinyl, LVT, LVP, Wood, Bamboo, Carpet, and more |
Cabling Specs
| Ideal Cable Spacing | 3″ |
| Wire | Energy efficient twin-conductor |
Identifiers
| SKU | WSHC-120-00057 |
| UPC (GTIN-12) | 881308021061 |
Logistics
| UNSPSC Code | 40101830 |
Videos
Articles
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