Wood & Williams
New white Ideal heat interface unit fitted in a utility cupboard, with insulated pipework above it, a wooden shelf unit to the left and a ventilation unit to the right

Replacing an ageing heat interface unit in Poole

Poole|October 2026
Unvented Cylinder Installation

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Before
Before: The old HIU, and the new Ideal Pod 405 fitted in its place
After
After: The old HIU, and the new Ideal Pod 405 fitted in its place

The old HIU, and the new Ideal Pod 405 fitted in its place

Project Gallery

Location
Poole
Services
Unvented Cylinder Installation

The heat interface units (HIUs) here were 7 to 8 years old and had become unreliable. An HIU does the job a boiler would do in a home on a shared heat network: it takes heat from the central system and turns it into heating and hot water for that home. These units had a history of leaks, and the replacement parts needed to keep them running were expensive.

For this home in Poole, we replaced the old HIU with a new Ideal Pod 405. The old unit shared a utility cupboard with the home's ventilation unit, so it had to be removed with care. The new Pod 405 then went in to work with the existing system, with new valves, fittings and copper pipework connecting it underneath to the existing pipes.

We also fitted Aquabion scale protection. It helps stop limescale building up inside the system, which protects the new unit and helps it stay reliable for longer.

Once everything was connected, we fully commissioned and tested the new HIU, setting it up and checking it works as it should.

The Ideal Pod 405 is a premium upgrade on the old unit. It's cleverly designed, gives better control over the hot water temperature and delivers reliable heating output. It also comes with a 2-year manufacturer's warranty.

If your HIU or hot water is giving you trouble, find out more about our hot water work.

A Job We've Completed

Cupboard in a doctors' surgery with a new white unvented hot water cylinder, an expansion vessel and two manifolds feeding white pipes, each labelled with the room it serves

Unvented Cylinder Installation

New hot water system for a doctors' surgery in Poole

Poole5 October 2026

See this job

Is your HIU letting you down?

If your heat interface unit is leaking, unreliable or hard to find parts for, tell us about it. We’ll talk you through the options for replacing it.

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