Watts Radiant UnderFloor Electric Heating Mats, 120VAC

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Watts Radiant HeatWeave UnderFloor Electric Heating Mats, 120V & 240V

HeatWeave® UnderFloor™ mats are the perfect solution for nearly every type of floor covering. These special mats warm existing floors without having to replace the floor coverings. If you have access under a floor, simply staple UnderFloor mats between the joists.

UnderFloor mats will warm wood, vinyl, laminates or tile floor coverings. They deliver 10 watts/sq ft of floor area (about 34 BTU/hr/sq ft). With UnderFloor mats, most floors can be heated up to 12° to 15°F warmer than they would otherwise be. Carpeted floors will not warm up as much as other floor coverings due to the high insulation value of carpet and padding. You may experience a temperature rise in the floor of only a 6°-10°F, which may or may not meet your satisfaction. Insulation installed below the mats is essential to complete the installation.

Easy staple-up installation between floor joists.
Manufactured in nearly 40 different lengths in 12", 16", and 19.2" widths. Mats of any size (same voltage) may be combined to heat any type of room.
120-VAC and 240-VAC models for small to large projects.
Highest-quality heating wire using Aramid reinforcing, ETFE high-temperature insulation, and oxygen-free copper alloys for corrosion-resistance, temperature-resistance, abrasion-resistance, and longevity.
Shielded and fully grounded 10-ft. power lead for safety and jobsite durability (longer lengths available on request). Power leads are color- coded for 120 VAC and for 240 VAC.
Do not install UnderFloor mats in mortar or cement, or install them in the same control zone as HeatWeave mats or WarmWire cables. These products have different heat output, and are manufactured for different applications.
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- Watts Electric Floor Heating Brochure (2.8 MB Adobe PDF)

Items that are not in stock will be ordered into our warehouse and immediately shipped out to the customer. We will notify the customer of stock status at the time we receive the order. To be on the safe side, plan your project ahead of time and allow a couple of weeks for delivery.


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12 in. Wide Mats , 120V (for joist bays spaced 12 in. on center)
Heatweave 12 in. UnderFloor Mat 120V, 5.5 ft Length Weight: 3 lb Model#: 1200512U2HW Order#: 81008814	$73.50
Heatweave 12 in. UnderFloor Mat 120V, 8 ft Length Weight: 3 lb Model#: 1200812U2HW Order#: 81008815	$101.50
Heatweave 12 in. UnderFloor Mat 120V, 10.5 ft Length Weight: 4 lb Model#: 1201012U2HW Order#: 81008816	$124.00
Heatweave 12 in. UnderFloor Mat 120V, 13 ft Length Weight: 4 lb Model#: 1201312U2HW Order#: 81008817	$156.25
Heatweave 12 in. UnderFloor Mat 120V, 16 ft Length Weight: 5 lb Model#: 1201612U2HW Order#: 81008819	$189.00
12 in. wide mats, 240V (for joist bays spaced 12 in. on center)
Heatweave 12 in. UnderFloor Mat 240V, 10.5 ft Length Weight: 4 lb Model#: 2401012U2HW Order#: 81008821	$124.00
Heatweave 12 in. UnderFloor Mat 240V, 16 ft Length Weight: 5 lb Model#: 2401612U2HW Order#: 81008822	$189.00
16 in. Wide Mats, 120V (for joist bays spaced 16 in. on center)
Heatweave 16 in. UnderFloor Mat 120V, 4 ft Length Weight: 3 lb Model#: 1200416U2HW Order#: 81008825	$68.00
Heatweave 16 in. UnderFloor Mat 120V, 6 ft Length Weight: 3 lb Model#: 1200616U2HW Order#: 81008826	$99.50
Heatweave 16 in. UnderFloor Mat 120V, 8 ft Length Weight: 3 lb Model#: 1200816U2HW Order#: 81008827	$130.25
Heatweave 16 in. UnderFloor Mat 120V, 9.5 ft Length Weight: 4 lb Model#: 1200916U2HW Order#: 81008828	$144.25
Heatweave 16 in. UnderFloor Mat 120V, 12 ft Length Weight: 4 lb Model#: 1201216U2HW Order#: 81008829	$181.50
Heatweave 16 in. UnderFloor Mat 120V, 14 ft Length Weight: 5 lb Model#: 1201416U2HW Order#: 81008830	$208.00
Heatweave 16 in. UnderFloor Mat 120V, 16 ft Length Weight: 5 lb Model#: 1201616U2HW Order#: 81008831	$234.50
Heatweave 16 in. UnderFloor Mat 120V, 18 ft Length Weight: 6 lb Model#: 1201816U2HW Order#: 81008832	$262.50
Heatweave 16 in. UnderFloor Mat 120V, 19.5 ft Length Weight: 6 lb Model#: 1201916U2HW Order#: 81008833	$281.50
16 in. wide mats, 240V (for joist bays spaced 16 in. on center)
Heatweave 16 in. UnderFloor Mat 240V, 8 ft Length Weight: 3 lb Model#: 2400816U2HW Order#: 81008834	$130.25
Heatweave 16 in. UnderFloor Mat 240V, 12 ft Length Weight: 4 lb Model#: 2401216U2HW Order#: 81008835	$181.50
Heatweave 16 in. UnderFloor Mat 240V, 16 ft Length Weight: 5 lb Model#: 2401616U2HW Order#: 81008836	$234.50
Heatweave 16 in. UnderFloor Mat 240V, 19.5 ft Length Weight: 5 lb Model#: 2401916U2HW Order#: 81008837	$281.50