The Harmoni 25m Pre-Made Frost Protection Trace Heating Kit is a complete, self-regulating trace heating system designed to stop exposed or vulnerable pipework from freezing throughout the winter months. Supplied pre-terminated with a built-in thermostat and 2m cold lead, the kit is ready to install straight out of the box — ideal for protecting long pipe runs in lofts, outbuildings, plant rooms and exposed external pipework.
At the heart of the system is a 12W/m self-regulating heating cable that uses a variable resistive compound to automatically adjust its output to the surrounding temperature. This means the cable delivers more heat where pipework is coldest and less where it isn't, eliminating the risk of overheating even where cable runs cross or overlap.
300W
Total Output (@10°C)
12W/m
Self-Regulating Power
-30°C
Min. Switch-On Temp
Independently Certified
This kit is certified by SGS Fimko to IEC 60800, the international standard governing self-regulating trace heating cables, giving installers and specifiers a verified independent safety benchmark.
Fuse Rating — Please Check Before Installing
The manufacturer's installation manual specifies a minimum fuse rating of 10A (Type C) for this product line. Always confirm the correct protective device rating against the installation manual supplied with the kit before connecting to the supply.
Self-Regulating Cable
The cable contains a variable resistive heating compound that automatically increases power output as temperatures fall and reduces it as they rise, so it cannot overheat even where cable runs overlap.
Built-In Thermostat
An integrated thermostat switches the system on only when protection is needed and keeps it dormant through the warmer months, so the kit runs unattended year after year.
Pre-Terminated & Ready to Fit
The cable arrives pre-terminated with a factory-fitted cold lead, thermostat and 13A 3-pin plug, so there's no cutting, stripping or electrical termination required on site.
Wide Operating Range
Rated to switch on at -30°C and to withstand exposure temperatures up to 65°C, giving reliable protection through the harshest UK winters.
Weatherproof IP67 Rating
An IP67 ingress protection rating means the cable is fully protected against dust and can withstand temporary immersion, suiting exposed outdoor pipework as well as indoor voids.
Independently Certified
Certified by SGS Fimko to IEC 60800, the international standard for self-regulating heating cables, giving installers a verified safety benchmark.
Installation Requirements
The manufacturer recommends this kit is installed by a qualified electrician and fitted in accordance with current local and international wiring regulations. The presence of trace heating cable must be indicated by on-site warning notices (for example, at the fuse box) and recorded in the property's electrical documentation. Pipe temperature must never exceed 60°C during normal operation, and the cable's minimum bend radius of 25mm must not be exceeded.
Once fitted, the cable must be covered with a minimum of 20mm of pipe lagging (Armaflex, PU foam or mineral wool) to retain heat efficiently. On plastic pipes and plastic components, the cable should first be wrapped in aluminium adhesive tape to protect the surface and improve heat transfer.
Electrical Specification
Power Output (@+10°C)
12 W/m
Total Rated Wattage (25m)
300W
Minimum Fuse Rating (Type C)
10A (see manufacturer note below)
Physical & Cable Construction
Outer Jacket
Modified Polyolefin
Metal Sheathing
Copper drain wire with aluminium mylar tape
Maximum Pipe Diameter
54mm
Thermal Performance
Minimum Installation Temperature
-30°C
Minimum Switch-On Temperature
-30°C
Maximum Exposure Temp (Energised)
65°C
Maximum Exposure Temp (De-energised)
65°C
Maximum Pipe Operating Temperature
60°C (must not be exceeded)
Approvals & Kit Contents
Approval
Certified by SGS Fimko to IEC 60800
Kit Contents
Trace heating cable, built-in thermostat, 2m cold lead, warning labels, cable ties, 13A 3-pin plug
Frequently Asked Questions
How much pipe will the 25m kit protect?
The 25m cable can be run along a single 25m length of pipe, or split across multiple shorter runs (single, double or triple pass) provided the total cable used does not exceed 25m. Coverage also depends on pipe diameter and insulation thickness — see the spec tables above.
Do I need an electrician to install this kit?
The kit is designed for straightforward DIY installation since it arrives pre-terminated with no wiring to complete. However, the manufacturer recommends installation by a qualified electrician and requires the work to comply with current local and international wiring regulations.
Does the thermostat need to be set manually?
No. The built-in thermostat automatically activates the cable only when protection is required and remains dormant during warmer weather, so there is nothing to programme or monitor.
Can this be used on plastic pipework?
Yes, but the manufacturer requires the cable to be wrapped in aluminium adhesive tape first when fitted to plastic pipes or plastic components, to protect the pipe surface and aid heat transfer.
What pipe insulation should I use alongside the cable?
After fitting the cable, the pipe must be insulated with a minimum of 20mm of lagging (Armaflex, PU foam, or mineral wool). Thicker insulation reduces heat loss and improves the cable's effectiveness in extreme cold.
Is this kit suitable for outdoor, exposed pipework?
Yes. With an IP67 rating and a minimum switch-on temperature of -30°C, the kit is built for exposed external pipework as well as unheated voids, outbuildings and lofts.
