Replacing an old outdoor unit like-for-like has a guide price of £6,000–£9,500, installed and including VAT. Where the system needs re-sizing or other upgrades, the written quote sets out each item. Grant funding rarely applies to replacements, because the Boiler Upgrade Scheme in England and Wales cannot usually fund a home already funded for a heat pump, so we check eligibility before quoting.
New outdoor units in Gwent may differ in size from the old one, so the base and position are checked at survey. Across Gwent and Gwent, old units are removed with their refrigerant recovered by an F-gas certified engineer. Every replacement in Gwent starts with a fresh heat loss survey, not just a copy of the old unit's size.
Who it suits
- Heat pumps nearing the end of their typical life with rising repair costs
- Systems that were undersized and struggle in cold weather
- Oversized systems that short cycle and cost more to run than expected
- Units that have failed with a major fault, such as a compressor failure
Grants and rules for heat pumps in Wales
In Wales 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; £2,500 for air-to-air). The MCS-certified installer named in your quote applies to Ofgem for you, and the grant comes off your quote.
Heat pump replacement prices in Gwent
Guide prices for Gwent, including VAT. We agree the visit rate before anyone attends, so there are no surprises on the day.
| Work | Installed guide price |
|---|---|
| Replacing an old outdoor unit like-for-like | £6,000–£9,500 |
| Full system replacement, 2–3 bedroom terrace or semi | £10,500–£13,500 |
| Full system replacement, 3 bedroom semi or small detached | £12,000–£15,500 |
| Full system replacement, 4 bedroom detached | £14,000–£18,000 |
Installed, inc VAT. Grant funding rarely applies to replacing a heat pump, so these prices are shown without any deduction; we check eligibility at survey.
Towns we cover in Gwent
We cover 11 towns in Gwent for heat pump replacement. Each links to local guide prices and the grant position for Wales.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Newport (Gwent) | NP20 | Risca | 7 h 49 min |
| Cwmbran | NP44 | Pontypool | 7 h 48 min |
| Pontypool | NP4 | Cwmbran | 7 h 47 min |
| Ebbw Vale | NP23 | Tredegar | 7 h 47 min |
| Risca | NP11 | Newport (Gwent) | 7 h 48 min |
| Blackwood | NP12 | Bargoed | 7 h 48 min |
| Abergavenny | NP7 | Crickhowell | 7 h 46 min |
| Caldicot | NP26 | Chepstow | 7 h 49 min |
| Chepstow | NP16 | Caldicot | 7 h 48 min |
| Monmouth | NP25 | Chepstow | 7 h 46 min |
| Tredegar | NP22 | Ebbw Vale | 7 h 47 min |
Heat pump replacement questions
How long does an air source heat pump last?
Air source heat pumps typically last 15–20 years, depending on the quality of the original design, how hard the unit has worked, where it is sited and how well it has been serviced. Units that short cycle or run at high flow temperatures for years may wear sooner. Annual servicing helps components last and spots problems early.
Will a new heat pump fit where the old one was?
Sometimes. A new unit may be a different size, weight or shape and may have different clearance requirements, so the existing base and position are checked at survey. The MCS noise assessment is carried out for the new unit, and a different position may be suggested if it improves performance or reduces sound at neighbouring windows.
Can I replace just the outdoor unit?
Often, yes, if the rest of the system is sound and correctly designed. The cylinder, controls and radiators can stay where they are compatible with the new unit. Some older cylinders and controllers do not work with a new heat pump, and the survey checks this. If the original design was the problem, replacing only the unit will not fix it.
What happens to my old heat pump?
The old outdoor unit is removed and disposed of responsibly. Its refrigerant is recovered first, which must be done by an F-gas certified engineer, and metals and components are recycled where facilities allow. If the old cylinder or controls are replaced too, they are removed at the same time, and pipework that is no longer needed is capped or taken out.