Yard Tools
Best roof and gutter heat cables, and the ratio nobody checks
Everybody buys these by the foot of cable. The maker's own instructions say you need four feet of cable for every foot of roof you are protecting.
Affiliate disclosure: we earn a commission if you buy through our links, at no extra cost to you. It never changes which product we rank first — here is how we're funded.
We have not tested these units. Every spec on this page comes from the manufacturer's own documentation and is linked to it. Every computed figure is arithmetic you can redo. Prices are checked daily — last verified November 13, 2026. Here is exactly how we pick.
Quick picks
Ranked on the published specs and the arithmetic below. Tap any row to jump to the full write-up. We have not tested these units -- here is exactly how we pick.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | Frost King RC100 Electric Roof Cable Kit, 100 ft The first kit in the line that covers a real roof edge -- twenty-five feet of it -- and the best coverage per dollar Frost King sells. | Best overall | 7.9 | |
| 2 |  Frost King RC160 Electric Roof Cable Kit, 160 ft The kit Frost King itself names when you ask about running cable down the downspouts, at 800W and forty feet of covered edge. | Best if you are doing the downspouts too | 7.7 | |
| 3 |  Frost King RC60 Electric Roof Cable Kit, 60 ft Sixty feet of cable is fifteen feet of roof edge at Frost King's published ratio -- a garage front or one dormer, not a house. | Best for one problem edge | 7.4 | |
| 4 |  Frost King RC30 Electric Roof Cable Kit, 30 ft The shortest kit in the line, and by Frost King's own 4-to-1 rule it covers about seven and a half feet of roof edge. | Smallest run Frost King sells | 7.0 | |
| 5 |  Frost King 099000 Self-Regulating Thermostat for Roof Cables Twenty-one dollars of control that decides whether an 800W roof cable runs in February or all year, and no roof kit ships with it. | The part the roof kits do not include | 7.5 | |
| 6 |  Snow Joe RJ208M Roof Rake with 20 ft Debris Slide The slide design is the right one -- snow leaves the roof instead of piling at your feet -- and Snow Joe publishes three different reach figures for it on one page. | Best overall | 8.0 |
#ad Buy links are affiliate links. Prices come from a live daily check; where we have no verified price we say "check price" rather than print a stale one.
Buy the Frost King RC100, and before you do, read the ratio: Frost King's own FAQ says that for every 20 feet of roof you plan to cover you need about 80 feet of cable. Four to one. Almost nobody shopping this category knows that, because it is not on the product page — it is in a buried support answer — and the result is that people buy a 60 ft kit for a 60 ft gutter and come up three quarters short. Every kit in this line is 120V at 5 watts per foot, so once you know the ratio the only real question is cost per foot of roof edge covered, and the RC100 wins it.
The short answer
The 4-to-1 rule, and why it is the whole page
Roof de-icing cable is installed in a zig-zag — Frost King calls it the “WWWW” pattern — running up the roof above the eave and back down, over and over, along the length you are protecting. The cable therefore travels several times the distance of the edge itself, and then typically runs down the downspout as well.
Frost King puts the resulting ratio in one sentence, in a support FAQ rather than on the product page:
Divide any kit length by four and you have its real coverage. That single division changes what you buy, and it is the reason the ranking below is by cost per covered foot rather than by price.
What Frost King publishes, and what it covers
| Kit | Cable length | Total watts | Roof edge covered (length / 4) | Cost per covered foot |
|---|---|---|---|---|
| RC30 | 30 ft | 150 W | about 7.5 ft | about $7.64 |
| RC60 | 60 ft | 300 W | about 15 ft | about $4.32 |
| RC100 | 100 ft | 500 W | about 25 ft | about $3.84 |
| RC160 | 160 ft | 800 W | about 40 ft | about $2.46 |
Lengths and the 5 watts per foot rating are Frost King's. Wattage, coverage and cost per covered foot are our arithmetic on Frost King's published 4-to-1 ratio and the live prices on 2026-11-07. Frost King also publishes RC80, RC120 and RC200 kits in the same line; we rank the four with live, in-stock listings at a price we verified today. Note that the RC160 is the cheapest per covered foot — it wins that metric and still is not our overall pick, for the amperage reason below.
The arithmetic
A 30 ft gutter run above a front door, with one downspout.
Frost King counts the downspout in the covered length, so call it 30 ft of edge.
30 ft x 4 = 120 ft of cable needed
So the honest answer for a 30 ft gutter is the RC120 or the RC160 — not the RC30, which the name invites you to match to a 30 ft gutter and which actually covers about seven and a half feet. The naming convention in this category is cable length, and the number buyers have in their head is roof length. Those differ by 4x.
Frost King publishes 5 watts per foot across the line.
RC100: 100 ft x 5 W = 500 W. 500 W x 8 h = 4.0 kWh
At a US residential average near $0.17/kWh: 4.0 x 0.17 = about $0.68 per running day
RC160: 800 W x 8 h = 6.4 kWh = about $1.09 per running day
Over a thirty-day cold spell running eight hours a day, that is roughly $20 for the RC100 and $33 for the RC160. Which is precisely why the separate thermostat matters: at 50 degrees F it stops the cable running in October, and it costs about a fifth of the RC100 kit.
RC100: 500 W / 120 V = 4.2 A
RC160: 800 W / 120 V = 6.7 A
Both fit inside a 15 A circuit on their own. The RC160 at 6.7 A is 45 percent of that breaker, so on a garage or exterior circuit already carrying a freezer, a door opener or a block heater it is a real addition rather than a trivial one. That is the reason our overall pick is the RC100 rather than the kit with the best cost per covered foot.
The picks, and who each one is for
1. Frost King RC100 — best overall
Who it is for: the common case — one problem edge of 20 to 25 feet, on a shingle roof, on an ordinary exterior circuit. It is the cheapest covered foot in the line that still leaves plenty of breaker headroom at a computed 4.2 A, and 25 ft of covered edge is enough to do a real section rather than a patch.
Who should skip it: anyone with a single ten-foot overhang — you would be paying for 50 ft of cable you cannot use, and the cable is pre-terminated so it must not be cut. And anyone with a metal roof, which Frost King excludes outright.
#ad Check the Frost King RC100 Electric Roof Cable Kit, 100 ft price on Amazon — how we're funded.
2. Frost King RC160 — best if you are doing the downspouts
Who it is for: a full gutter run plus its downspouts. Frost King itself names the 160 ft and 200 ft kits when asked about running cable down a downspout, so this is the maker's own answer rather than our extrapolation, and at about $2.46 per covered foot it is the best value in the line.
Who should skip it: anyone whose exterior circuit is already loaded. Our arithmetic puts this at 6.7 A, nearly half a 15 A breaker, and a tripped breaker in a storm defeats the entire purpose of the product.
#ad Check the Frost King RC160 Electric Roof Cable Kit, 160 ft price on Amazon — how we're funded.
3. Frost King RC60 — best for one dormer
Who it is for: the fifteen feet of edge where the ice actually forms — one dormer, one garage front, the overhang above a door you walk under. Three hundred watts is 2.5 A, which will share a circuit with almost anything.
Who should skip it: anyone who measured their gutter rather than their problem. Fifteen feet of covered edge is less than most houses need, and two RC60s cost more than one RC100 for less coverage.
#ad Check the Frost King RC60 Electric Roof Cable Kit, 60 ft price on Amazon — how we're funded.
4. Frost King RC30 — smallest kit made
Who it is for: one valley, or one short overhang, where the ice forms in the same square yard every year. Nothing else in the line goes this small.
Who should skip it: nearly everyone else. At about 7.5 ft of covered edge it is the most expensive covered foot in the line by a factor of two, and buying it because “30 ft” sounds like a roof length is the exact mistake this page exists to prevent.
#ad Check the Frost King RC30 Electric Roof Cable Kit, 30 ft price on Amazon — how we're funded.
5. Frost King 099000 thermostat — the part no kit includes
Who it is for: everyone buying any cable above. It switches at a published 50 degrees F, it is weather resistant, and it is the difference between a cable that runs in February and a cable that runs all year. At roughly a fifth of the RC100's price it pays for itself in a season of avoided running cost by our arithmetic.
Who should skip it: only someone whose cable is on a switched outlet they will genuinely remember. Two honest marks against it: 50 degrees F is a high threshold, so it will run on mild autumn nights when no ice is possible, and Frost King publishes no amperage rating for it on the page we reached — so matching it to the 800 W RC160 takes a spec sheet we could not find.
#ad Check the Frost King 099000 Self-Regulating Thermostat for Roof Cables price on Amazon — how we're funded.
6. Snow Joe RJ208M roof rake — the no-electricity answer
Who it is for: metal roofs, which Frost King excludes; renters who cannot fix anything to a roof; and anyone who would rather spend twenty minutes after a snowfall than wire a 500 W load to an eave. It costs nothing to run and works on any roof material.
Who should skip it: anyone away from the house during storms, because a rake needs a person. And note the published mess we record on our roof rake page: Snow Joe publishes three different reach figures for this one rake — 26 ft in the bullets, 28 ft in the spec table and 22 ft in the table's own Features row.
#ad Check the Snow Joe RJ208M Roof Rake with 20 ft Debris Slide price on Amazon — how we're funded.
Which answer, by what your roof is
| Your situation | Buy | Why |
|---|---|---|
| 20-25 ft problem edge, shingle roof | RC100 + 099000 thermostat | Cheapest covered foot at a safe 4.2 A |
| Full gutter run plus downspouts | RC160 + thermostat | Frost King names this kit for downspout runs |
| One dormer or garage front | RC60 + thermostat | 15 ft of covered edge at 2.5 A |
| One valley, same spot every year | RC30 + thermostat | The only kit that goes this small |
| Metal roof | Snow Joe RJ208M roof rake | Frost King states its kits are for shingle roofs only |
| You are away during storms | Any cable, with the thermostat | A rake needs a person; a cable does not |
| Steps and walkways, not the roof | Heated mats | Different problem, different product |
What these cables do not do
- They do not stop ice dams forming. Frost King's own claim is about “keeping melt water flowing through gutters and downspouts” — a drainage claim. A dam forms because heat escaping the attic melts snow higher up the roof; the cable keeps a channel open for that water, it does not fix the heat loss.
- They are not self-regulating. These are fixed-resistance cables at a flat 5 watts per foot. Self-regulating cable, which varies its output along its length, is a different and dearer product class.
- They cannot be cut to length. The kits are pre-terminated, so sizing is a purchase decision, not an installation one. Which brings you back to the 4-to-1 rule.
- They do not come with the thermostat. Said twice on this page deliberately, because the kit page does not say it once.
Verdict
The RC100 wins on the only ranking that makes sense once you know the ratio: about 25 feet of covered roof edge at roughly $3.84 a foot, on a load that will not crowd a breaker. The RC160 is cheaper per foot and is the maker's own recommendation if the downspouts are in scope, at the cost of 6.7 A. Add the 099000 thermostat to whichever you buy. The finding to carry away is the one Frost King prints in a support FAQ and nowhere else: these kits are named for their cable length, and the roof length they cover is a quarter of that number.
The picks in full
Specs are the manufacturer's own and linked to the page they came from. Prices come from a live daily check; where we have no verified price we say so rather than print a stale one.
Frost King RC100 Electric Roof Cable Kit, 100 ft
Frost King · Corded 120V · Our score 7.9/10
#ad Price as of November 13, 2026. Prices change; we check daily. How we're funded.
The first kit in the line that covers a real roof edge -- twenty-five feet of it -- and the best coverage per dollar Frost King sells.
Published specs
| Cable length | 100 ft |
|---|---|
| Voltage | 120V |
| Rating | 5 watts per foot |
| Total draw | 500W (100 ft x 5 W/ft) |
| In the box | Shingle clips, cable spacers, instructions |
| Thermostat | Not included -- sold separately |
| Roof type | Shingle only; not for metal roofs |
Source: Electric Roof Cable Kits (RC100, 100 feet, 120V, 5 Watts per foot), frostking.com
100 ft of cable / 4 (Frost King's published 80-ft-per-20-ft ratio) = 25 ft of roof edge. At the $95.98 live price, 95.98 / 25 = $3.84 per foot of edge. Against the RC60 at $64.78 for 15 ft that is $4.32/ft, and the RC30 at $57.30 for 7.5 ft is $7.64/ft. The 100 ft kit is the cheapest covered foot in the line.
What the numbers favor
- 25 ft of covered roof edge -- enough for a real problem edge rather than a single spot
- Cheapest cost per covered foot of the four kits, by our arithmetic on Frost King's own ratio
- 500W / about 4.2 A, still an ordinary circuit
- Clips and spacers included
What they don't
- No thermostat in the box, which on a 500W load is the difference between running in February and running in July
- Fixed resistance rather than self-regulating
- Shingle roofs only
- The published rule means you cannot size this by eye -- measure the edge AND the downspout first
Skip it if the problem edge is short. Twenty-five feet of coverage on a ten-foot overhang is fifty feet of cable you paid for and cannot use, because the cable is pre-terminated and must not be cut.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Frost King RC160 Electric Roof Cable Kit, 160 ft
Frost King · Corded 120V · Our score 7.7/10
#ad Price as of November 13, 2026. Prices change; we check daily. How we're funded.
The kit Frost King itself names when you ask about running cable down the downspouts, at 800W and forty feet of covered edge.
Published specs
| Cable length | 160 ft |
|---|---|
| Voltage | 120V |
| Rating | 5 watts per foot / 800W total |
| In the box | Shingle clips, cable spacers, instructions |
| Thermostat | Not included -- sold separately |
| Roof type | Shingle only; not for metal roofs |
| Maker's own guidance | Named for downspout runs, with the 200 ft kit |
Source: Electric Roof Cable Kits (RC160, 160 feet, 120V, 5 Watts per foot), frostking.com
160 ft / 4 = 40 ft of roof edge, including the downspout, on Frost King's published 80-ft-per-20-ft ratio. At 800W that is 6.7 A on a 120V circuit -- still inside a 15 A breaker, but no longer something to add casually to a loaded garage circuit.
What the numbers favor
- Forty feet of covered edge, the only kit here that handles a full gutter run plus its downspouts
- Frost King names this kit (with the 200 ft) specifically for downspout runs, so you are not guessing
- Published 800W figure, so you can do the amperage yourself
What they don't
- 6.7 A is a real load; on a shared circuit with a freezer or a space heater this is how breakers trip in a storm
- No thermostat included, and at 800W that omission costs the most of any kit in the line
- Pre-terminated, so a too-long run cannot be trimmed
- Shingle roofs only
Skip it if you are protecting one overhang. Forty feet of coverage is the answer to a gutter-and-downspout problem, not a spot problem, and the amperage follows you around.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Frost King RC60 Electric Roof Cable Kit, 60 ft
Frost King · Corded 120V · Our score 7.4/10
#ad Price as of November 13, 2026. Prices change; we check daily. How we're funded.
Sixty feet of cable is fifteen feet of roof edge at Frost King's published ratio -- a garage front or one dormer, not a house.
Published specs
| Cable length | 60 ft |
|---|---|
| Voltage | 120V |
| Rating | 5 watts per foot |
| Total draw | 300W (60 ft x 5 W/ft) |
| In the box | Shingle clips, cable spacers, instructions |
| Thermostat | Not included -- sold separately |
| Roof type | Shingle only; not for metal roofs |
Source: Electric Roof Cable Kits (RC60, 60 feet, 120V, 5 Watts per foot), frostking.com
Frost King's rule is 80 ft of cable per 20 ft of roof edge including the downspout -- 4:1. 60 / 4 = 15 ft of roof edge. At 5 W/ft the kit draws 60 x 5 = 300W, or 2.5 A on a 120V circuit.
What the numbers favor
- Fifteen feet of covered edge is a realistic single-problem answer: one dormer, one garage front, one door overhang
- 300W total is 2.5 A, so it will share a circuit with almost anything
- Clips and spacers included
What they don't
- Still only 15 ft of edge -- most houses with an ice dam problem have more edge than that
- No thermostat included
- Shingle roofs only, per Frost King
- Frost King publishes no operating temperature range for the roof cable itself
Skip it if you intend to run cable down the downspouts as well. Frost King says that job wants the 160 ft or 200 ft kit, and the downspout run counts against your 20 ft of covered edge.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Frost King RC30 Electric Roof Cable Kit, 30 ft
Frost King · Corded 120V · Our score 7.0/10
#ad Price as of November 13, 2026. Prices change; we check daily. How we're funded.
The shortest kit in the line, and by Frost King's own 4-to-1 rule it covers about seven and a half feet of roof edge.
Published specs
| Cable length | 30 ft |
|---|---|
| Voltage | 120V |
| Rating | 5 watts per foot |
| In the box | Shingle clips, cable spacers, instructions |
| Thermostat | Not included -- sold separately |
| Roof type | Shingle only; not for metal roofs |
| Install pattern | "WWWW" along the roof edge |
Source: Electric Roof Cable Kits (RC30, 30 feet, 120V, 5 Watts per foot), frostking.com
Frost King states: "for every 20 feet (including the downspout) of roof you plan to cover, you will need approximately 80 feet of Roof Cable." That is a 4:1 ratio of cable to roof edge. 30 ft of cable / 4 = 7.5 ft of roof edge. This is the figure almost nobody checks before buying.
What the numbers favor
- The only kit short enough for a single problem spot -- one valley, one short overhang above a door
- Ships with the shingle clips and cable spacers, so there is nothing else to buy to mount it
- Same 5 watts per foot as every other kit in the line, so nothing is given up electrically
What they don't
- Covers roughly 7.5 ft of roof edge by Frost King's own arithmetic -- buy this expecting 30 ft of coverage and you will be short by a factor of four
- No thermostat in the box, so without the separate control it runs whenever it is plugged in
- Frost King states the roof kits are for shingle roofs only, not metal
- Fixed resistance, not self-regulating: the cable does not modulate its own output along its length
Skip it if you have a whole roof edge to protect rather than one spot. At 4:1 you need 80 ft of cable for 20 ft of edge, and three RC30s cost more than one RC100.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Frost King 099000 Self-Regulating Thermostat for Roof Cables
Frost King · Corded 120V · Our score 7.5/10
#ad Price as of November 13, 2026. Prices change; we check daily. How we're funded.
Twenty-one dollars of control that decides whether an 800W roof cable runs in February or all year, and no roof kit ships with it.
Published specs
| Switching temperature | On and off automatically at 50 deg F |
|---|---|
| Type | Self-regulating |
| Weather resistance | Weather resistant, per Frost King |
| For | Roof cable kits (the pipe kits have one built in) |
| Model | 099000 |
Source: Thermostats for Roof Cable Kits (turns power on and off automatically at 50 degF), frostking.com
Thermostat $20.98 live, RC100 kit $95.98 live. 20.98 / (95.98 + 20.98) = 18% of the total spend. That is the fraction of the budget that decides whether the cable is a winter appliance or a year-round one -- and it is the fraction most buyers leave out, because the kit page does not force the choice.
What the numbers favor
- Switches at a published 50 deg F, so you know exactly when it hands over
- Weather resistant and designed for the roof kits specifically
- Cheapest line item in any roof-cable install, and the one that changes the running cost
What they don't
- It is a separate purchase that the roof-cable kit pages do not include, which is how it gets forgotten
- 50 deg F is a high threshold -- the cable will run on mild autumn nights when no ice is possible
- Frost King publishes no amperage rating for it on the page we reached, so matching it to the 800W kit takes a spec sheet we could not find
- No published temperature differential, so you cannot tell how often it will cycle
Skip it only if the cable is on a switched outlet you will actually remember to turn off. The honest version of that sentence is: almost nobody does, which is why this part exists.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Snow Joe RJ208M Roof Rake with 20 ft Debris Slide
Snow Joe · Manual · Our score 8.0/10
#ad Price as of November 13, 2026. Prices change; we check daily. How we're funded.
The slide design is the right one -- snow leaves the roof instead of piling at your feet -- and Snow Joe publishes three different reach figures for it on one page.
Published specs
| Slide | 15 in x 20 ft polyester |
|---|---|
| Blade length | 15 in |
| Max reach (spec table) | 28 ft |
| Net weight | 6.2 lb |
| Pole options | 28 / 24.4 / 20.9 / 17.3 / 13.8 ft (four poles) |
| Roller wheels | 3 in |
| Warranty | 2 years |
Source: Snow Joe RJ208M PRO Snow Removal Roof Rake w/ 20-Foot Debris Slide, 28-Foot Max Reach, shopjoe.com
Snow Joe's bullets say up to 26 ft of overhead reach; the spec table's Overhead Reach row says 28 max; the table's Features row says up to 22 ft. Three numbers, one page, one tool. We rank on the spec table because it is the structured field, and we publish the spread.
What the numbers favor
- The polyester slide moves snow off the roof rather than dropping it at the base of the wall, which is the actual job
- 6.2 lb net -- light enough to hold overhead at full extension, which matters more here than on any other yard tool
- Four poles give five working lengths, so one tool fits a single story and a two-story gable
- 3 in roller wheels keep the blade off the shingles
What they don't
- Three contradictory reach figures on the maker's own page: 26, 28 and 22 ft
- The spec table's Extension Pole Lengths row (22 / 18 / 14.2 / 10.3 / 6.4 ft) does not match the pole lengths in its own bullets
- Product Width and Wheel Size rows in the spec table are published empty
- A fabric slide is a consumable, and Snow Joe sells hardware packs but not the slide
you have a single-story ranch with a shallow pitch and a safe place for a ladder. At that height a cheaper telescoping rake does the job and the slide is overkill.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Where to buy the tools on this page
Amazon affiliate links, except where a product has no Amazon listing — those go direct to the maker and earn us nothing, and the button says so. We show no price we have not verified today, so where there is no live figure the link says "check price" and takes you to the listing to read it there.
Best overall
Frost King RC100 Electric Roof Cable Kit, 100 ft
Frost King · Corded 120V
Best if you are doing the downspouts too
Frost King RC160 Electric Roof Cable Kit, 160 ft
Frost King · Corded 120V
Best for one problem edge
Frost King RC60 Electric Roof Cable Kit, 60 ft
Frost King · Corded 120V
Smallest run Frost King sells
Frost King RC30 Electric Roof Cable Kit, 30 ft
Frost King · Corded 120V
The part the roof kits do not include
Frost King 099000 Self-Regulating Thermostat for Roof Cables
Frost King · Corded 120V
Best overall
Snow Joe RJ208M Roof Rake with 20 ft Debris Slide
Snow Joe · Manual
#ad As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. How we're funded.
Common questions
How much heat cable do I need for my roof?
What is the best roof heat cable?
Do roof cable kits come with a thermostat?
Do heat cables prevent ice dams?
Can I use roof heat cable on a metal roof?
What does it cost to run a roof heat cable?
Why is Easy Heat not on this list?
Is a roof rake or a heat cable the better answer?
Sources
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