If you have a combi, there is no cylinder at the moment, so the first question is where one can go. If you have a system or regular boiler, you already have a cylinder, but it is unlikely to suit a heat pump, which needs a larger internal coil to heat water at lower temperatures. Regular boilers also have tanks in the loft that can usually be taken out, freeing space.
Households across Clwyd moving off gas can have a survey in Clwyd that compares running costs on realistic assumptions. Semi-detached and terraced houses in Clwyd often have an airing cupboard that can be reused for a heat pump cylinder. Rear gardens and side returns in Clwyd usually offer a sensible spot for the outdoor unit, checked for airflow and neighbours.
Who it suits
- System or regular boiler homes with an existing airing cupboard
- Boilers that are old, unreliable or due for replacement
- Combi owners who can find space for a hot water cylinder
- Homes in England and Wales eligible for the Boiler Upgrade Scheme
Grants and rules for heat pumps in Wales
Homes in Clwyd can use the Boiler Upgrade Scheme, which applies in Wales as well as England: £7,500 towards an air source heat pump, or £9,000 when it replaces oil or LPG heating for installations from 21 July 2026 to 31 March 2027. The MCS-certified installer named in your quote applies and deducts the grant.
There is no VAT on installing a heat pump anywhere in the UK, Wales included, until 31 March 2027. Planning rules for heat pumps in Wales are set by the Welsh Government and differ from England's, so the surveyor checks the unit position against them.
Gas boiler to heat pump prices in Clwyd
The ranges below are typical installed prices for homes in Clwyd, including VAT. A survey sets the exact figure, because two similar-looking houses in Clwyd can need quite different radiators and pipework.
| Home | Typical size | Installed guide price | After £7,500 grant |
|---|---|---|---|
| 1–2 bedroom flat or small terrace | 4–5 kW | £9,500–£12,500 | £2,000–£5,000 |
| 2–3 bedroom terrace or semi | 5–7 kW | £10,500–£13,500 | £3,000–£6,000 |
| 3 bedroom semi or small detached | 6–9 kW | £12,000–£15,500 | £4,500–£8,000 |
| 4 bedroom detached | 8–12 kW | £14,000–£18,000 | £6,500–£10,500 |
| 5+ bedroom or larger older house | 11–16 kW | £16,500–£22,500 | £9,000–£15,000 |
Installed, inc VAT: unit, cylinder, controls, minor pipework and commissioning.
Towns we cover in Clwyd
We cover 16 towns in Clwyd for replacing a gas boiler with a heat pump. Each links to local guide prices and the grant position for Wales.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Wrexham | LL13 | Rhosllannerchrugog | 7 h 33 min |
| Buckley | CH7 | Mold | 7 h 32 min |
| Deeside | CH5 | Connah's Quay | 7 h 31 min |
| Colwyn Bay | LL29 | Conwy | 7 h 30 min |
| Flint | CH6 | Connah's Quay | 7 h 31 min |
| Rhyl | LL18 | Prestatyn | 7 h 30 min |
| Rhosllannerchrugog | LL14 | Wrexham | 7 h 33 min |
| Prestatyn | LL19 | Rhyl | 7 h 30 min |
| Llandudno | LL30 | Conwy | 7 h 30 min |
| Abergele | LL22 | Rhyl | 7 h 30 min |
| Connah's Quay | CH5 | Deeside | 7 h 31 min |
| Conwy | LL31 | Llandudno | 7 h 30 min |
| Denbigh | LL16 | Ruthin | 7 h 32 min |
| Llangollen | LL20 | Rhosllannerchrugog | 7 h 34 min |
| Mold | CH7 | Buckley | 7 h 32 min |
| Ruthin | LL15 | Denbigh | 7 h 32 min |
Replacing a gas boiler with a heat pump questions
Do I need to replace the cylinder I already have?
Usually, yes. Older cylinders have a small internal coil designed for water from a boiler at around 60–70°C, and they cannot take in heat quickly enough at the lower temperatures a heat pump runs at. A heat pump cylinder has a larger coil. On its own, a cylinder supplied and fitted has a guide price of £1,200–£2,200, installed and including VAT, though it is normally part of the full system price.
Is there a grant to replace a gas boiler with a heat pump?
In England and Wales, the Boiler Upgrade Scheme gives £7,500 towards an air-to-water heat pump that replaces a gas boiler, for eligible owners of existing homes. The MCS-certified installer applies to Ofgem and deducts the grant from your quote, and Ofgem contacts you to confirm. Scotland has separate Home Energy Scotland funding, and Northern Ireland has no dedicated homeowner grant at present.
What if my gas boiler is fairly new?
A newer boiler can still be replaced, but the timing is worth weighing. Some owners switch when the boiler needs a major repair; others prefer to plan the change for a convenient time. Across the UK, heat pump installation is zero-rated for VAT until 31 March 2027. A hybrid system, which keeps the boiler alongside a heat pump, is another option, though it is not eligible for the Boiler Upgrade Scheme in England and Wales.
Will my hot water run out with a heat pump?
Not if the cylinder is sized properly for your household. The survey asks how many people live in the home, how many bathrooms you have and whether you prefer baths or showers, then sizes the cylinder to suit. The heat pump reheats the cylinder on a schedule, often overnight and again during the day, and an immersion heater acts as a backup.