How it works
Hot Water Cylinder Replacement
Swap a bulky hot water cylinder for a compact heat battery — mains-pressure hot water that charges when electricity is cheapest.
Certified & registered
- MCS Certified
- NAPIT Approved
- RECC Registered
- Approved Sunamp Installer
The trouble with an old hot water cylinder
A traditional vented cylinder is large, loses heat steadily through the day and delivers hot water at gravity pressure rather than mains pressure. It takes up most of an airing cupboard and much of what it heats is wasted keeping itself warm.
What a heat battery does differently
A thermal store holds heat in a phase-change material rather than a tank of standing water. It is significantly more compact, holds its charge better, and delivers hot water at mains pressure. It can be set to charge overnight on a cheaper rate, or from solar PV during the day where that is fitted.
How the heat battery makes hot water
The store charges from mains electricity — on an off-peak rate where one exists — or from solar PV, and holds that energy as latent heat in the phase-change material. When a tap opens, a high-powered heat exchanger transfers the stored heat to cold mains water on demand. Hot water arrives at mains pressure, and because no hot water is ever stored, there is no tank of standing water to keep warm or maintain.
Small, insulated, unhurried
High-grade vacuum insulation keeps standing losses low, and the phase-change material stores several times more energy than the same volume of water — which is why the unit is around a quarter of the size of the cylinder it replaces. It also does not care what the rest of the house runs on: the store can be linked to an existing gas boiler as its charge source where that suits.
Suitability
Where it suits — and where it doesn't
Replacing a vented cylinder
The classic case: the airing-cupboard cylinder goes, the compact store takes a fraction of the space, and the shower gains mains pressure.
Solar households
Daytime generation can charge the store instead of being exported — hot water becomes the storage you already needed.
Time-of-use tariffs
The store can charge overnight on the cheap rate and deliver hot water through the day.
Homes staying on gas
The store is not electric-only: it can be linked to a traditional gas boiler as the charge source where that suits the property.
The scope
What's included
- Mains-pressure hot water
- Charges on off-peak rates
- Far smaller than a vented cylinder
- Frees up airing cupboard space
How the job runs
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Free home survey
We visit, measure each room and look at how you actually live in the house. Heat output is sized per room — a guess made over the phone is how people end up cold in the room they use most.
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A written recommendation
You get a clear proposal setting out what we would install, why that specification, and what it costs. No pressure and no obligation to go ahead.
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Removal and disposal
Removal and disposal of old storage heaters, convector heaters, boilers and cylinders is part of the job, and we make good afterwards.
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Installation and handover
We install, test and then show you how to run it. Getting the controls right is most of the saving, so we do not leave until you know how to use them.
Covering Christchurch & the South
We provide hot water cylinder replacement throughout Bournemouth, Poole, Christchurch, Weymouth, Dorchester, Salisbury, Dorset, Hampshire, Wiltshire, Somerset, Devon and the surrounding area — planned at a free home survey, with a written recommendation and no obligation.
Prefer to talk it through? Call 01202 985047.
