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Heat pump running cost in Plymouth
What does an air-source heat pump actually cost to run in Plymouth, what does it save vs keeping a gas boiler, and when does it break even? This page uses the same assumptions as our full heat pump calculator — a typical UK 3-bed semi with average insulation, SCOP 3.3, current Ofgem-cap tariff — scaled by the regional heat demand in South West England.
What makes Plymouth different
Plymouth's Atlantic-moderated climate gives it one of the shortest heating seasons in the UK — a heat pump pays for itself faster here than almost anywhere else.
The figures above use a 3-bed semi-detached home with average insulation (SCOP 3.3), 12220 kWh of heat demand per year, and the current Ofgem default-tariff price cap (27.03p/kWh electricity, 6.04p/kWh gas). If your home is bigger, smaller, better or worse insulated, switch to the full heat pump calculator and pick your own archetype — the numbers can swing £200–£600/yr either way.
Don't forget the £7,500 BUS grant
The UK government's Boiler Upgrade Scheme covers up to £7,500 of a heat pump install for owner-occupiers and small landlords in England and Wales. Scotland has its own (more generous) Home Energy Scotland Grant and Loan. Either way, the grant is deducted from the installer's quote — you never handle the money. Check your eligibility in our BUS grant calculator .
Other cities in South West England
Regional heat demand varies more than most people expect — coastal cities often beat inland ones by 5–10%.
| City | Multiplier | HP £/yr | Gas £/yr | Payback | 15-yr net |
|---|---|---|---|---|---|
| Bristol | 0.98 | £1266 | £1020 | 19.5 yrs | £-1806 |
| Bournemouth | 0.92 | £1202 | £965 | 19.4 yrs | £-1723 |
| Plymouth (this page) | 0.94 | £1223 | £983 | 19.4 yrs | £-1750 |
| Exeter | 0.95 | £1234 | £992 | 19.4 yrs | £-1764 |
| Bath | 0.98 | £1266 | £1020 | 19.5 yrs | £-1806 |
| Gloucester | 1.00 | £1287 | £1038 | 19.6 yrs | £-1834 |
Compare other cities
Pick any UK city to see its heat pump running cost side-by-side with Plymouth.
Before you commit in Plymouth
Three local factors decide your real running cost: your home's insulation level (a D-rated home runs 20% higher than C-rated), your radiator sizing (undersized rads drop SCOP fast), and installer pricing (the range within a single city can be £3k–£5k on the same job). Get at least three MCS-certified quotes before committing.
Insulate first, size second. Drop heat demand by 20–30% with a good cavity wall / loft insulation package and you'll buy a smaller heat pump for less up front — our heat loss calculator shows the size difference insulation makes. If you're also modelling solar, check the solar panel savings calculator — a heat pump running on cheap solar is one of the best UK home-energy combinations.