Mor Electric Heating Logo

Questions? 1-800-442-2581
8:00am-5:00pm M-F (Eastern Time)

Shopping cartShopping Cart

Our secure online ordering website:
ur other websites: and

Home | Ordering | Contact Us | Heaters | Controls | Accessories | Search

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 Heat Trace Controls
Danfoss Ice Guard Self-Regulating Roof & Gutter Deicing Cable. Pre-Terminated Self-Regulating Cable for roofs.


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.)

Secure Online Credit Card Ordering - SSL Encryption
delivery time: typically ships in 1 working day or less plus allow additional time for your selected UPS or FedEx shipping method.  Price below does not include shipping cost which is calculated using your address before entering your credit card number.

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


Chromalox® is a registered trademark.

Home ] Up ]

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 1999-2019 Mor Electric Heating Assoc., Inc.

5880 Alpine Ave. NW - Comstock Park, MI 49321  USA
Tel 616-784-1121 - 800-442-2581 - Fax 616-784-7775

   follow our blog   Find us on FaceBook   watch our youtube channel   Follow us on Twitter