CRJ Pipe Freeze Protection Cable

CRJ Pipe Freeze Protection Cable
  • Prevents water from freezing in metal or plastic pipes
  • Avoids the cost and inconvenience of burst pipes
  • Self-regulating technology and recommended thermostat control ensures lowest possible running costs

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
CRJM-11 11W/m self-regulating cable  (supplied by the metre) £7.00/m
CRJM-17 17W/m self-regulating cable  (supplied by the metre) £8.00/m
CRJ-25 25W/m self-regulating cable  (supplied by the metre) £15.00/m
CRJ-T1 Termination kit (one required per circuit) £11.00
CRJ-S Splice kit (one required per splice or T joint) £10.00
PF-L Caution label (10 pack) £5.00
PF-T Fixing tape 33m x 19mm £2.00
AL-50 Aluminium tape 45m x 50mm (for use with plastic pipes) £10.00
FST2-IN Frost Thermostat 20A for indoor use £68.00
FST2-EX Frost Thermostat 20A for outdoor use £129.00

Technical Specification


  • Supplied by the metre
  • Self-regulating technology prevents energy waste and reduces running costs
  • Cable can be double wrapped without creating ‘hotspots’
  • Electrical connections are made at one end only
  • Cable can be cut to length with affecting watts per metre output
  CRJM-11 CRJ-17 CRJ-25
Voltage: 230V 230V 230V
Nominal output at 5°C: 11W/m 17W/m 25W/m
Minimum installation temperature: -40°C -40°C -40°C
Maximum exposure temperature (power on): 65°C 65°C 85°C
Maximum exposure temperature (power off): 85°C 85°C 85°C
Minimum bending radius: 20mm 20mm 35mm
Maximum circuit length: 128m 102m 124m


  • Tin coated copper bus wires
  • Self-regulating polymer
  • Thermoplastic insulation
  • Continuous metal earth braid
  • UV resistant thermoplastic overjacket

Maximum length (m) against breaker size (use type C breaker)


Cable Start-up
6A 10A 16A 20A
CRJM-11 5°C 76m 126m 128m ———-
0°C 70m 118m 128m ———-
-20°C 46m 78m 124m 128m
CRJM-17 5°C 54m 88m 102m ———-
0°C 50m 84m 102m ———
-20°C 34m 56m 88m 102m


Cable Start-up
16A 20A 32A
 CRJ-25 10°C 88m 117m 124m
  -15°C 58m 75m 117m
  -30°C 45m 64m 100m


If you would like the experts at BN Thermic to select a pipe freeze protection system for you, please click below to access our enquiry form.  Simply provide as much information as you have available and we will respond with a detailed proposal.

Enquiry Form

Cable Selection

Use the following tables to select the correct output and length of cable for your application.  Usually a single run of the appropriate output cable will suffice however in some circumstances the cable should be applied in an evenly spaced helix.  Table one also indicates the thickness of insulation which should cover both pipe and heating cable.

Selection Table 1

Based on a minimum ambient temperature of -18°C and rock wool insulation

Outside Pipe
Insulation Thickness (mm)
12 25 50
12 CRJM-11 Straight CRJM-11 Straight CRJM-11 Straight
25 CRJM-17 Straight CRJM-11 Straight CRJM-11 Straight
50 CRJ-17 1.6m cable/1m pipe
CRJ-25 Straight
CRJM-11 Straight CRJM-11 Straight
75 ———————————- CRJM-11 Straight CRJM-11 Straight
100 ———————————- CRJM-17 Straight CRJM-11 Straight
150 ———————————- CRJM-17 1.1m cable/1m pipe
CRJ-25 Straight
CRJM-17 Straight

Table two indicates the additional cable lengths required to offset the increased heat losses associated with flanges, valves and supports.

CRJ Selection Table Two (minimum ambient temperature -20°C)

Pipe Diameter
Additional cable length (m)
Pair of flanges Valve Support
12 0.23 0.10 0.10
25 0.28 0.15 0.10
50 0.30 0.30 0.15
75 0.45 0.40 0.15
100 0.60 0.50 0.20
150 0.80 0.60 0.25

Selection of Ancillary items

Termination kit

One CRJ-T1 termination kit will be required per circuit.  The kit includes the necessary crimps and shrink-on material to prepare one end of the cable for electrical connection and to effectively seal the far end.  The kit also includes a nylon gland suitable for making a moisture tight seal into a suitable terminal enclosure.

Splice kit

One CRJ-S1 slice kit will be required for each splice or T joint.  .  The kit includes the necessary crimps and shrink-on material to join two lengths of cable and to effectively seal the far end.

Fixing Tape

PF-T fixing tape is supplied in 33m rolls and is ideal for fixing heating cable to the pipe.  We recommend securing the cable at 200mm intervals.

Aluminium Tape

When heating a plastic pipe, the pipe should be wrapped in aluminium tape before the heating cable is installed.  AL-50 is supplied in 45m x 50mm rolls.

Warning Labels

PF-L warning labels are supplied as a pack of 10 and should be fixed to the outside of the insulation at regular intervals.


To ensure maximum economy, the use of a frost thermostat is strongly recommended.  Select from the FST2-IN for indoor installations and the FST2-EX for outdoor installation. Both thermostats can switch 20A (230V) directly.