Reviewed by the CCS Heating & Renewables Technical Team
MCS-certified Cornwall installer · 200+ installs
Last updated June 2026
Renewable heating systems in Cornwall: the honest overview
Cornwall is one of the best places in the UK to go renewable. It is the sunniest county in the country, a large share of homes are off the gas grid and still burning expensive oil or LPG, and the mild coastal climate means heat pumps run efficiently for most of the year. That combination is exactly why renewable heating systems in Cornwall often pay back faster here than in colder, gas-connected parts of the country.
There are four technologies that do the heavy lifting, and the best results almost always come from combining them rather than treating them as either/or:
- Air source heat pumps — the default low-carbon heating choice for most Cornish homes, eligible for the £7,500 Boiler Upgrade Scheme grant. See our air source heat pump installation page.
- Ground source heat pumps — the most efficient option where there is garden space for a ground loop or budget for a borehole. Explore ground source heat pumps.
- Solar PV — generates your own electricity at 0% VAT and earns money back through the Smart Export Guarantee. See solar panel installation.
- Battery storage — stores solar (or cheap off-peak) electricity so more of it powers your home and heating. Compare battery storage in Cornwall.
For a deeper look at the heat-pump side specifically — air versus ground, cost and suitability across the county — see our heat pumps Cornwall hub. Below, we put all four systems in one table so you can see indicative cost, the relevant grant, typical annual saving and payback at a glance.
Renewable heating systems compared
The figures below are indicative ranges for a typical Cornish home — your exact numbers depend on property size, heat loss, current fuel and the equipment specified at survey. Heat-pump savings are shown against oil/LPG, which is what most off-gas Cornish homes are replacing.
| System | Indicative Cornwall cost | Grant / incentive | Typical annual saving | Payback |
|---|---|---|---|---|
| Air source heat pump | £9,000–£14,000 (≈£2,500–£7,000 after grant) | £7,500 BUS | £300–£900 vs oil/LPG | 7–12 yrs |
| Ground source heat pump | £18,000–£35,000 (less £7,500 grant) | £7,500 BUS | £600–£1,300 vs oil/LPG | 10–20 yrs |
| Solar PV (4–5 kWp) | £5,000–£9,000 | 0% VAT + SEG | £400–£700 + SEG income | 6–10 yrs |
| Battery storage (5–10 kWh) | £3,500–£8,000 fitted | 0% VAT | £300–£600 (self-use) | 8–12 yrs |
The headline: a heat pump delivers the largest carbon and bill saving for off-gas homes, while solar and a battery shorten payback on the electricity a heat pump consumes. That is why the fastest-paying setups we install in Cornwall pair a heat pump with solar and storage — each technology covers the other's weakness.
Air source heat pumps
An air source heat pump (ASHP) extracts low-grade heat from outside air and upgrades it to heat your radiators, underfloor heating and hot water. For around three to four units of heat per unit of electricity, it is far more efficient than direct electric, oil or LPG. For the typical Cornish home it is the single most cost-effective route to renewable heating, and it qualifies for the full £7,500 Boiler Upgrade Scheme grant.
Modern R290 (propane) units reach flow temperatures of up to 70–75°C, which means they suit the granite, cob and solid-wall properties common across Cornwall — provided the system is correctly sized after a proper heat-loss survey. We fit supplier-neutral, so we specify the right unit (Vaillant aroTHERM Plus, Mitsubishi Ecodan, Daikin Altherma and others) for your home rather than pushing one brand. Full detail is on our air source heat pump installation page.
Ground source heat pumps
A ground source heat pump (GSHP) draws heat from the ground via buried pipework — either a horizontal loop in a field or garden, or a vertical borehole where space is tight. Because ground temperature is stable year-round, a GSHP is the most efficient heating technology available and gives the lowest running costs of any system here. It carries the same £7,500 BUS grant as an air source unit.
The trade-off is higher upfront cost and the need for land (for a loop) or drilling access (for a borehole), so it suits larger or rural Cornish properties with the space and budget. If you are weighing the two, our ground source heat pumps page covers loop-versus-borehole, cost and suitability in detail.
Solar PV and battery storage
Heat pumps run on electricity, so the cheapest way to run one is to generate that electricity yourself. Solar PV panels produce power whenever there is daylight — and Cornwall's high irradiance means a well-sited array generates strongly from spring through autumn. Domestic solar carries 0% VAT until 31 March 2027, and surplus generation earns money back through the Smart Export Guarantee (SEG).
Add a battery and the picture improves again: instead of exporting cheap daytime solar and buying it back expensively in the evening, you store it and use it when your heat pump and household need it. Batteries also let you charge from cheap off-peak tariffs. See solar panel installation and our Cornwall battery storage guide for sizing, brands and fitted prices.
Grants and the Boiler Upgrade Scheme in 2026
Grants and incentives differ by technology, and getting this right materially changes payback. Heat pumps use the Boiler Upgrade Scheme; solar and batteries use 0% VAT and SEG instead. Here is how the 2026 picture breaks down:
| Technology | Grant value (BUS) | Notes / who qualifies |
|---|---|---|
| Air source heat pump | £7,500 | England — homeowners & small landlords; replacing fossil-fuel heating |
| Ground source heat pump | £7,500 | England — same scheme, same grant value as air source |
| Solar PV panels | Not BUS-eligible | 0% VAT to 31 Mar 2027 + Smart Export Guarantee income |
| Battery storage | Not BUS-eligible | 0% VAT to 31 Mar 2027 (standalone or with solar) |
Crucially, the £7,500 BUS grant applies to both air source and ground source heat pumps — there is no difference in grant value between the two. Lower-income and certain off-gas households may also access ECO4, GBIS or the Warm Homes: Local Grant. We check every available scheme during your survey and handle the BUS paperwork end to end.
Renewable energy installers in Cornwall
Choosing the right renewable energy installers in Cornwall matters as much as choosing the technology. A poorly sized heat pump or a badly sited solar array underperforms for its whole life — and the BUS grant can only be claimed through an MCS-certified installer, so accreditation is non-negotiable. As a genuinely local firm, we survey in person, design for Cornish housing stock and coastal conditions, and stay close for servicing afterwards.
For homeowners researching renewable energy in Cornwall more broadly, the practical sequence is: book a heat-loss survey, get a system designed for your specific property, confirm grant eligibility, then install. CCS Heating & Renewables is based at Unit 4, Pool Business Park, Pool, Redruth TR15 3QW, MCS-certified, and we serve the whole of Cornwall — from Penzance and the far west through Truro and Falmouth across to St Austell, Bodmin and the east.
We cover all the core towns: Redruth, Camborne, Truro, Falmouth, St Austell, Newquay, Penzance and Bodmin, plus everywhere in between. Whether you want a single technology or a combined solar-plus-heat-pump-plus-battery system, we design and install it as one coordinated whole.