Quick verdict
A 60 foot pre-assembled electric heating cable that clips along gutters and down into downspouts to keep a melt channel open, preventing ice dams and frozen downspouts. For rainwater harvesters it keeps the downspout and diverter draining through freeze-thaw cycles so water does not back up into the gutter. It needs a GFCI outlet and should be switched off when temperatures are well above freezing.
Strengths
- Pre-assembled and ready to install with included clips
- Keeps gutters and downspouts flowing through freeze-thaw cycles
- Helps prevent ice dams and roof leaks
- Sixty feet covers a typical gutter run plus a downspout
- Established Frost King brand with clear instructions
Weaknesses
- Uses electricity whenever plugged in; add a thermostat or timer
- Installation on a roof edge is ladder work
- Not a rain barrel heater; barrels still need draining before winter
The overall YardToolLab Score is out of 100. Section scores are out of 10.
Winter Is Where Rainwater Systems Break
Most damage to a rainwater setup happens in winter: a downspout freezes solid, meltwater backs up into the gutter, and the diverter and barrel line split when the ice expands. Frost King’s RC60 is a 60 foot heating cable that clips along the gutter edge and loops into the downspout, keeping a channel of meltwater flowing through freeze-thaw cycles. Its main job is preventing ice dams on the roof; for harvesters, keeping the spout and diverter draining is the bonus.
This review is based on Frost King’s specifications and on how roof and gutter de-icing cables perform generally. We have not installed this cable ourselves.
How It Works
The cable warms a few degrees above freezing wherever it runs. Zig-zagged along the roof edge it melts channels through snow so water reaches the gutter; laid in the gutter and dropped down the downspout it keeps that path open to the ground. Water never sits and refreezes behind a plug of ice, which is what causes dams and burst spouts.
Installation
The RC60 arrives pre-assembled with clips and instructions. Clip it to the shingle edge in a zig-zag, run it along the gutter bottom and loop it into the downspout to the outlet, then plug into a GFCI outdoor outlet. Sixty feet covers a typical gutter run and one downspout; measure before buying. It is ladder work at the roof edge, so do it in autumn before ice.
For Rainwater Harvesters
Keeping the downspout flowing protects the diverter from ice and lets you drain the barrel line cleanly before a hard freeze. The barrel itself should still be emptied and disconnected for winter; the cable does not and cannot heat stored water.
Running Cost and Control
A 60 foot cable draws a few hundred watts whenever plugged in. Left on all winter it adds up; used only in freeze-thaw conditions, ideally through a thermostat plug that switches it on near freezing, it is modest. Frost King sells a compatible thermostat separately.
Durability
Frost King cables have a long record. Owners report several winters of service when the cable is removed or inspected each spring and not left kinked.
Who Should Buy It
- Homes with ice dam history on the gutter line.
- Rainwater harvesters in freeze-thaw climates whose downspouts ice up.
- Anyone with a downspout that discharges onto a walkway and freezes.
Common Owner Complaints
Electricity use when left on continuously and the effort of roof-edge installation. A thermostat plug and an autumn install address both.
Alternatives to Consider
Self-regulating heat cable costs more and modulates its own output. Frost King’s longer RC series lengths suit bigger roofs. Improving attic insulation reduces ice dams at the source.
Verdict
The RC60 is a proven, inexpensive way to keep gutters and downspouts flowing through winter, which protects both the roof and a rainwater diverter. Pair it with a thermostat, install before the first ice and drain the barrel separately.
Full specifications
Frost King RC60 60 Foot Roof and Gutter Heating Cable FAQs
A frozen downspout backs water up and can damage a diverter or split a barrel line. Keeping the spout flowing lets you drain the system cleanly and prevents ice from forming where the diverter sits.
No. It is a gutter and downspout cable. Barrels should be drained and disconnected before freezing weather.
A 60 foot cable draws a few hundred watts. Running it only during freeze-thaw periods, ideally through a thermostat plug, keeps the bill reasonable.
Yes. Frost King designs it to loop down into the downspout so the outlet stays open.
