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Chromalox SRF-RG Commercial Grade Roof & Gutter Heat Trace Cable

Chromalox Electric Heaters and Controls
Mor Electric Heating is an authorized distributor for Chromalox®

Links to other roof heating cable:
Easy Heat ADKS Roof and Gutter Heat Trace Cable
EASYHEAT PSR Pre-Terminated Self-Regulating Freeze Protection Cable for Water Pipes and Roofs
Danfoss RX Roof & Gutter Deicing Cables.

ETI LCD-7 Automatic Control For Snow Melting
ETI Heat Trace Controls
NuHeat Plug-in 13mm Roof and Gutter De-Icing Kits. Pre-Terminated Self-Regulating Cable for roofs.
Danfoss Ice Guard Self-Regulating Roof & Gutter Deicing Cable. Pre-Terminated Self-Regulating Cable for roofs.

Our blog on Roof and Gutter Heating Cable


Chromalox SRF-RG self-regulating heating cable provides reliable freeze protection of roofs and gutters. Because SRF-RG is self-regulating, it automatically adjusts to the appropriate heat output as ambient conditions change, making it both energy efficient and cost effective. The protective waterproof outer jacket is suitable for wet applications in downspouts and roof drains.  Likewise, it is easy to apply SRF-RG following the provided instruction sheets and utilizing the required accessory kits. It can be cut-to-length and single overlapped. Simply trace the gutter or roof and energize the cable when precipitation is expected. From that point on, SRF-RG will rapidly increase its output when in contact with snow or ice, providing maximum melting power. When the roof and gutters are clear of snow and ice, the SRF-RG cable will regulate its output and save energy.


  • 12 Watts/foot in snow or ice @32°F
  • FM Approved
  • UL Listed for snow melting and de-icing equipment.
  • CSA Certified
  • Cut to length in field
  • Self-Regulating output


Buss Wire -16 AWG, Nickel-Coated Copper
Outer Jacket - UV Stabilized Weatherproof Jacket
Environmental Use - Use only in Ordinary Areas, 150°F Max. Exposure Temperature
Output Wattage - 12 W/Ft. in Snow or Ice @ 32°F
Service Voltage - SRF 5-1RG = 120 Vac, SRF 5-2RG = 208 - 277 Vac

Ground Braid - Tinned Copper Braid Under Jacket

1. To calculate the amount of cable needed, multiply roof edge length to be heat traced by the spacing factor. The spacing factor (feet of cable required per foot of roof edge) is determined by the roof overhang, heating width (A) and heating height (B):

Roof Overhang Heating Width Heating Height Spacing Factor
12" 2 18" 2
24" 2 30" 3
36" 2 42" 4

2. Add the total gutter length and the total downspout length to the figure calculated in step 1.

3. Also add enough cable to provide a drip loop prior to going into the box, typically 6" to 36", to get the total length of cable required.

4. Determine how many circuits are required. Divide the total length of cable by the maximum circuit length. Round that number up (for example, 2.1 to 3) to get the total number of circuits.

Maximum Circuit Length (Ft.)

Note: The SRF-RG cable is sold by the foot and therefore a custom order.  Once the order is placed it cannot be cancelled or returned once you receive the cable.  This is because the cable is cut to length here, or at Chromalox, for your order, from your requested length.

WARNING — A ground fault protection device is required by NEC to minimize the danger of fire if the heating cable is damaged or improperly installed. A minimum trip level of 30 mA is recommended to minimize nuisance tripping.  Suggested breakers with 30 mA ground fault trip levels are:
• 120V Single Pole Westinghouse GFEPD, Square D QO, EPD Style
• 120/240V Single Pole Westinghouse GFEPD, Square D QO, EPD Style.


RG-SK-1 Splice Kit Materials to splice two cables.  (Not a T-Splice) Special weatherproof sleeving to insure trouble-free operation

RDK-1 Downspout Hanger Kit Downspout hangers (1) to suspend cable in downspout

RCK-1 Roof Clips Roof clips (10) to attach cable (Use roof cement to secure)

RG-PK-1 Power & End Seal & Warning Labels, Power termination into junction box with one end seal (seals cable at end termination) and two "Warning-Electric Traced" labels.

AT-1 Aluminum High Temperature Tape roll (Secures Heat Trace in Gutter) with a pressure-sensitive acrylic adhesive backing. 2" (5.08 cm) wide x 150 ft. (54.86 m) long roll, 200° F (93°C) rated. 2 mil. thickness (Specifications may vary.)

Crydom 3RHP Series, AC Input, 3 Phase Hybrid Solid State Contactor, 40-50 Amp Output, (280 or 600 VAC (A replacement for Mercury). Solid state and mechanical switching technologies are combined to provide the performance advantages of both technologies in the industry standard DP contactor package
Chromalox 4003 DIN-Rail Mount Three Phase Power Controller. (A replacement for Mercury Contactors/Relays), Three Phase Loads up to 60 Amps, 575 Vac, 9-35 Vdc, 100-240 Vac or 24 Vac Input Signals, Easy DIN-Rail or Sub-Panel Installation, Size Compatible for Easy Replacement of Mercury Displacement Relays, Optional Integral Heatsink Thermostat
SB-1800 Surebond Everflex Bondaprene. For adhering metal roof clips to metal roofs only. Not for shingles (Asphalt)
ETI SST-2 Freeze Protection Thermostat Automatic freeze protection, 40°F (4.4°C) set point, Automatic supply voltage selection, Two-pole contactor switches up to 30 AMP heater loads, Alarm relay with isolated contact, Integral 30 mA GFEP , C-UL-US listed, Simple to install and operate, Minimum energy costs
MODEL GIT-4 Automatic Gutter Ice Melting Control.  Remote monitor and control included, operates ice melting heaters only while required.  Gutter-mounted computerized sensor and a control enclosure connected by a 12' 6" (3.8 meter) cable. Heaters operate at temperatures below 38º F (3.3º C)  120, 208/240 or 277 volt supply
LCD-7 Aerial Snow Controller Automatic Control For Snow Melting. Snow Switch. Energy saving alternative to thermostat, manual or timer controls. 120 volt direct heater control for small applications such as wheelchair ramps and stairways or may operate external contactors in larger installations.
ETI MODEL GIT-3A Automatic gutter ice melting control.  Control operates ice melting heaters only while required Gutter-mounted sensor and a control enclosure connected by a 12' 6" cable. Senses both moisture and temperature conditions in the gutter or down spout.  Ice melting heaters operate at temperatures at or below 38º F (3.3º C).  120, 208/240 or 277 volt supply

Chromalox SRF-RG Installation Instructions

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Item Id Catalog No. Description

Click "Select" below to see our price and actual real-time quantity in stock

CHROM386329 SRF5-1RG 120V Cable with braid and weatherproof jacket (Price per foot)


CHROM386337 SRF5-2RG 208 - 277V Cable with braid and weatherproof jacket (Price per foot)


CHROM386206 RG-PK-1 Power & End Seal & Warning Labels


CHROM386214 RG-SK-1 Splice Kit


CHROM340179 RCK-1 Roof Clips


CHROM340160 RDK-1 Downspout Hanger


CHROM383355 AT-1 Aluminum tape roll


ETI19556 GIT-4

Gutter Ice Melting Control


ETI19554 GIT-3A

Gutter Ice Melting Control


MORSNOW10001 SB-1800 Everflex Bondoprene Select
ETI10006 LCD-7UL ETI Snow Switch® (Automatic Control For Snow Melting) Select
ETI22744 SST-2 ETI Freeze Protection Thermostat Select
CHROM329762 4003-40610 Chromalox 4003 DIN-Rail Mount Power Controller (A replacement for Mercury Relays). 40AMP 3PH 600V, 100 to 240Vac Input Select
CHROM329789 4003-60610 Chromalox 4003 DIN-Rail Mount Power Controller (A replacement for Mercury Relays). 60AMP 3PH 600V, 100 to 240Vac Input Select
CRYDOM10002 3RHP6050F Crydom RHP Series Hybrid Solid State Contactor, 100-130 VAC Control, Contactor 50 Amp 600 VAC Select

Chromalox® is a registered trademark.

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We are a Distributor of Industrial, Commercial and Residential Heaters and Controls. Always consult manufacturers installation instructions for proper installation of the products or systems shown on this website. © Copyright 1999-2015 Mor Electric Heating Assoc., Inc.

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