GP Self-regulating Cable for Gutters and Downpipes

CRJ Pipe Freeze Protection Cable
  • Stops the accumulation of ice in gutters and downpipes
  • Ensures that rain and melt-water can drain away normally and not cause damage to properties
  • Reduces risks from collapsing gutters and falling icicles.

Range & Prices

The prices shown are list prices and perfectly safe to use for budget purposes. Contact your electrical wholesaler for final prices.

Model Description List Price
GP-18 Self regulating cable GP-18 Self-regulating cable  (supplied by the metre) £13.00
GC-P Gel filled end seal GC-E Gel filled end seal £14.00
GP-S Spacer kit GP-S Spacer kit (5 stainless steel spacers and 10 cable ties) £20.00
FST2-EX Frost Thermostat for external use FST2-EX Weatherproof Frost Thermostat £129.00

Technical Specification

GP-18 cable

Voltage: 230V
Nominal output at 0°C in ice water: 36W/m
Nominal output at 0°C in air: 18W/m
Minimum installation temperature: -40°C
Maximum exposure temperature (power on): 60°C
Maximum exposure temperature (power off): 85°C
Minimum bending radius: 35mm
Maximum circuit length: 90m



  • Tin coated copper bus wires
  • Self-regulating polymer with bonded jacket
  • Thermoplastic insulation
  • Tin coated copper earth braid
  • UV resistant thermoplastic overjacket


Breaker size for GP-18 cable

Breaker (Type C) Cable Length (m)
10A 1 to 60
16A 60 to 65



If you would like the experts at BN Thermic to select a gutter protection system for you, please send an email to  with details of your application and we will respond with detailed proposal.

GP_gutters diag 1

Cable selection for gutters

A single run of GP-18 self-regulating heating cable will protect gutters with widths up to 120mm.  For wider gutters add an additional run for every 120mm increase in width.  For example a 350mm wide gutter will require 3 runs of cable.

Cable selection for downpipes

For downpipes at the end of a gutter a single run of GP18 self-regulating cable will be required.  The cable should extend approximately 500mm below ground level.

For downpipes which interrupt a gutter, a loop of cable should be installed with the end of the loop extending approximately 500mm below ground level.




GC-E gel filled end seal will be required to seal the end of the cable.

We suggest that a suitable gel-filled connector is used to connect heating cable to power lead
(typically 2.5mm² twin and earth)

Spacer Kits

A GP-S spacer kit consists of five stainless steel spacers and 10 UV resistant cable ties.  The spacers are used to protect the heating cable as it passes over a sharp edge and to maintain the correct spacing when multiple cable runs are installed in a gutter.

GP_spacer kits


Control by means of FST2-EX (20A 230V) IP65 thermostat is recommended for economy.