A heat pump hot water cylinder is an insulated tank that stores hot water heated by the heat pump, with a much larger internal coil than a cylinder designed for a boiler. Heat pumps heat water to a lower temperature than boilers, typically around 45–55°C, so a bigger coil is needed to pass heat into the stored water quickly. A standard boiler cylinder would heat slowly and make the heat pump work harder than it should.
Many homes in Surrey with combi boilers have no airing cupboard, so the survey looks for the most practical cylinder space. Cylinder sizes for Surrey homes are based on the people living there and the bathrooms in daily use. We check mains water pressure and flow at each Surrey property before choosing a cylinder.
Who it suits
- Every air-to-water heat pump installation, whatever the existing boiler
- Households with older vented cylinders and loft tanks who want mains-pressure showers
- Homes replacing a combi boiler that need space found for a cylinder
- Larger families or homes with two or more bathrooms
Grants and rules for heat pumps in England
In England the Boiler Upgrade Scheme gives £7,500 towards an air source heat pump (£9,000 if it replaces oil or LPG, from 21 July 2026 to 31 March 2027), and since 28 April 2026 a valid EPC is no longer needed. The grant is applied for by the MCS-certified installer and shown as a deduction on your quote.
There is no VAT on installing a heat pump anywhere in the UK until 31 March 2027. In England most houses can have an air source heat pump under permitted development, provided the unit meets the MCS noise and siting standards; the old 1 m boundary limit was removed on 29 May 2025. We flag listed buildings, flats and sensitive conservation-area positions at survey.
Heat pump hot water cylinders prices in Surrey
Here are typical prices for heat pump hot water cylinders in Surrey, installed and including VAT. Use the guide price tool for a figure based on your home, then a survey confirms it in writing.
| Work | Guide price |
|---|---|
| Heat pump hot water cylinder (supplied and fitted) | £1,300–£2,350 |
Supplied and fitted, inc VAT. Included in every full system price.
Towns we cover in Surrey
We cover 14 towns in Surrey for heat pump hot water cylinders. Each links to local guide prices and the grant position for England.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Woking | GU22 | Guildford | 7 h 51 min |
| Guildford | GU1 | Godalming | 7 h 52 min |
| Redhill | RH1 | Reigate | 7 h 52 min |
| Farnham | GU9 | Aldershot | 7 h 52 min |
| Camberley | GU15 | Sandhurst | 7 h 51 min |
| Egham | TW20 | Woking | 7 h 50 min |
| Godalming | GU7 | Guildford | 7 h 53 min |
| Reigate | RH2 | Redhill | 7 h 52 min |
| Horley | RH6 | Redhill | 7 h 53 min |
| Dorking | RH4 | Reigate | 7 h 52 min |
| Haslemere | GU27 | Godalming | 7 h 54 min |
| Cobham | KT11 | Woking | 7 h 51 min |
| Cranleigh | GU6 | Godalming | 7 h 53 min |
| Oxted | RH8 | Westerham | 7 h 52 min |
Heat pump hot water cylinders questions
How much does a heat pump cylinder cost?
A heat pump hot water cylinder has a guide price of £1,200–£2,200, installed and including VAT. In a full heat pump installation the cylinder is already included in the system guide price, so this figure mainly applies where a cylinder is replaced on its own. Capacity, coil design and the pipework needed affect where your price sits.
I have a combi boiler. Where will the cylinder go?
Moving from a combi to a heat pump means finding space for a cylinder, usually somewhere around 600 mm square and up to about 2 m tall. Common choices are a bedroom or landing cupboard, a utility room, under the stairs or an integral garage. The surveyor looks at your layout and suggests options, including slimline models where space is tight.
Can I keep my existing hot water cylinder with a heat pump?
Usually not. Cylinders designed for boilers have a small coil that cannot transfer heat quickly at heat pump temperatures, so the water would reheat slowly and efficiency would suffer. A heat pump cylinder has a much larger coil. The new cylinder can often go in the same cupboard, though, if there is enough height and floor space.
Will I run out of hot water with a heat pump?
Not if the cylinder is sized to how your household uses hot water. Unlike a combi, hot water is stored, so very heavy use, such as several long showers back to back, can use up the stored volume before it reheats. Sizing for your busiest period, and timing reheats sensibly, avoids this for most homes.