Best Pipe Heat Cables for Freeze Protection (2026)
Three self-regulating thermostat heat cables, compared on the label. We have not tested them.
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A thermostat heat cable warms a pipe only when it gets cold. These three all switch on near 38°F and differ in watts per foot and length.
Quick picks
- Best for short runsHC Automatic Electric Heat CableCheck price
- Best documentedAHB Pipe Heating CableCheck price
- Best for long runsPipe Heating Cable 31100 (100 ft)Check price
Side-by-side specs
| Spec | Top pickFrost KingHC Automatic Electric Heat Cable | EasyHeatAHB Pipe Heating Cable | Wrap-OnPipe Heating Cable 31100 (100 ft) |
|---|---|---|---|
| Best for | Short runs of supply pipe | Pipes up to 1.5 in | Long runs at low wattage |
| Power | 7 W/ft, 120 V (21 W to 210 W by length) | 7 W/ft, 120 VAC | 2 W/ft, 120 V (200 W total) |
| Thermostat | On below 38°F, off above 45°F | On at 38°F or below, off at about 45°F | On at 38°F |
| Freeze protection | To -40°F (per Frost King) | See manual | To -50°F (per Wrap-On listing) |
| Pipe types | Metal and plastic water supply pipe | Water-filled metal or plastic, up to 1.5 in | Metal and rigid plastic water pipe |
| Lengths | 3, 6, 9, 12, 18, 24, 30 ft | Several kit lengths | 100 ft (31100) |
| Notes | Power indicator light on plug | GFCI protection required (per manual) | Insulation over the cable required |
| Price | Check price | Check price | Check price |
Specs from each manufacturer's US product page. Bars compare each spec against the best value in this table; they are not test scores. Prices change often, so we link out instead of quoting them.
The picks
★Best for short runs
Frost KingHC Automatic Electric Heat Cable
Best for: Short runs of supply pipe
A preassembled 7 W/ft heat cable with a built-in thermostat, sold in lengths from 3 to 30 ft.
What we like
- Built-in thermostat
- Many lengths
Watch out for
- Fixed lengths; buy to fit your pipe
7 W/ft, on below 38°F and off above 45°F, in lengths from 3 to 30 ft.
★Best documented
EasyHeatAHB Pipe Heating Cable
Best for: Pipes up to 1.5 in
A 7 W/ft constant-wattage cable with a built-in thermostat for water-filled metal or plastic pipes up to 1.5 in diameter.
What we like
- Clear pipe-size limit
- Built-in thermostat
Watch out for
- Needs a GFCI outlet
7 W/ft for water-filled pipes up to 1.5 in. The manual says to use GFCI protection.
★Best for long runs
Wrap-OnPipe Heating Cable 31100 (100 ft)
Best for: Long runs at low wattage
A 100 ft, 200 W cable (2 W/ft) with a built-in thermostat. Wrap-On says pipe insulation is required.
What we like
- Long single length
- Low wattage per foot
Watch out for
- Must be insulated over
100 ft at 2 W/ft. Wrap-On says insulation over the cable is required.
How to choose
- Measure the pipe run and pick a length that fits.
- Follow the instructions on wrapping, spacing and insulation, and use a GFCI outlet where required.
- See how to prevent frozen pipes for no-cost steps first.
Frequently asked questions
When does a heat cable turn on?
All three list a built-in thermostat that turns on at about 38°F.
Do I need to insulate over the cable?
Wrap-On says yes for its cable. Check the instructions for any kit.
