16 March 2026
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Advertorial
DiversiTech International (formally known as Pump House) has been working in the UK heat pump sector for over 18 years. Paul Greengrass, Product Development Director, provides air source heat pump installation solutions focusing on insulation.
Insulation
When you consider that the heat being generated by the heat pump is flowing through the pipework, if the pipe being routed is outside, it is critical that all pipework and connections are covered by an external grade weather and UV-stable insulation.
The normal grey coloured polyethylene insulation used inside a house is not UV-stable and breaks down very quickly when exposed to the external environment. Air conditioning systems would normally have black Class O insulation - which has a high fire and smoke rating, but this is also not ideal in an external UV environment and can break down within a few years. When this break down occurs the insulation properties are affected, and again the heat pump compressor must work harder and therefore consume more electricity.
DiversiTech has undertaken site assessments and using thermal imaging cameras have shown the impact of heat loss when pipework and fittings are not adequately insulated. To combat this, all of our hose sets come with Class O insulation with a coating that is UVstable and rodent and bird proof.
Bridging the gap
The pipework from the unit needs to pass through an external wall of the property and to avoid heat loss via the brickwork due to cold bridging, the pipes need to be insulated all the way through to the inside of the house.
Our 19mm PVC external grade coated insulation (weather and waterproof) range helps installations comply in both boiler condensate and ASHP installations. Available in 2-metre
lengths. Our insulation is also available in a pre-slit and seal version, which is a time-saving alternative with the same insulating properties.
Our Through The Wall Kit is specifically designed to insulate the pipes running through the wall from the exterior to interior. The thermal imagery shows just how much heat is lost when the pipes are not properly insulated.
To learn more, visit our website https://diversitech.global/ or contact our sales team on [email protected]
