How long does an HIU service take?

A standard single-unit service typically takes under an hour, depending on access and unit condition.

What’s the difference between a service and a repair?

A service is a scheduled health check that prevents faults; a repair fixes a fault that’s already happened. See our [HIU Repair London] page if your unit already has a problem.

Can you service a whole block in one visit?

Yes — we schedule multi-unit and whole-block servicing efficiently to minimise disruption. See [HIU Maintenance for Property Managers].

Do you service all HIU brands?

Yes, including Danfoss, Caleffi, Evinox and other major brands — see [HIU Brands We Repair & Service].

HIU SERVICING | HIU Experts

LONDON'S HIU SPECIAL

HIU Servicing London — Annual Heat Interface Unit Service

Regular servicing is the difference between an HIU that quietly runs for years and one that fails in the middle of winter. HIU Experts provides annual HIU servicing across London — for individual flats, whole blocks and multi-site portfolios.

Most HIU manufacturers, including Danfoss, Caleffi and Evinox, recommend annual servicing to maintain performance and protect the warranty. HIU Experts is a Gas Safe registered HIU specialist covering all of London, with servicing available for single flats and full-block contracts.

KEEP YOUR HIU RUNNING RELIABLY

Regular HIU servicing helps identify faults early, maintain heating and hot water performance, and reduce the risk of unexpected breakdowns. Our specialist engineers service Heat Interface Units across London, checking key components, controls, temperatures and overall system performance.

BOOK A SERVICE

Heat exchanger check and descaling

Flow and return temperature verification

Heat meter and replacement reading check

PICV and control valve testing

Flow and return temperature verification

Service report preparation and submission

What's Included in Our HIU Service

Our engineers follow a manufacturer-aligned service routine for every brand — we don't just tick boxes, we measure performance and report exactly what we found.

HIU REPAIR

Why HIUs Need Annual Servicing

Heat Interface Units handle high temperatures, scale-prone water and constant duty cycles. Without servicing, plate heat exchangers fur up, strainers clog, actuators stick and efficiency drops over time — driving up bills and risking failure at the worst possible moment.

PROPERTY MANAGEMENT SUPPORT

Limescale build-up on plate heat exchangers

Sticking control valves and PICVs

Reduced flow rate and efficiency loss

Clogged strainers restricting flow

Drifting temperature sensors and actuators

Worn seals and isolation valves