Why oil-heated homes are the best candidates for solar panels

Published 19 February 2026

Around 1.5 million homes in England and Wales use heating oil. Most are rural, most are detached or semi-detached, and most have large roofs that face roughly south. They are, by almost every measure, ideal for solar panels.

But that is not the main reason. The real advantage is what comes next.

The two-step opportunity

Solar panels generate electricity, not heat. So on day one, they do not replace your oil boiler. They reduce your electricity bill: lighting, appliances, hot water (if you add a solar immersion diverter for around £200-£300). A typical 4kWp system saves £700 to £900 a year through self-consumption and export income.

That alone pays back in 8 to 10 years. Good, but not exceptional.

The exceptional part happens when you replace your oil boiler with a heat pump. Suddenly, your heating runs on electricity. And you already have panels on your roof generating it for free.

Oil to heat pump is the single most impactful switch a UK homeowner can make. And solar panels make it dramatically cheaper to run.

Why oil homes specifically

Five things set oil-heated homes apart from the rest of the housing stock.

1. Oil is expensive and volatile

Heating oil (kerosene) currently costs around 58p per litre. A litre of kerosene contains about 10 kWh of energy, so the effective rate is roughly 5.8p/kWh. That sounds cheaper than gas (5.74p/kWh), but oil boilers are typically less efficient (80-85% vs 90%+ for modern gas boilers), and you lose more heat in the distribution system. The real cost per usable kWh is closer to 7p.

More importantly, oil prices are unpredictable. In early 2022, heating oil hit 99p per litre. People who had just filled their tank at 40p watched their neighbours pay more than double. There is no price cap, no regulator, and no protection. You are exposed to global crude oil markets every time you order.

2. Oil homes are usually detached with large roofs

Oil-heated properties tend to be in rural areas where the gas grid does not reach. Rural means detached houses with bigger plots and bigger roofs. More roof area means more panels, more generation, and a faster payback. A terraced house in a city might fit 8 panels. A detached farmhouse could fit 16.

3. Oil homes qualify for the £7,500 BUS grant

The Boiler Upgrade Scheme gives you £7,500 towards an air source heat pump if you are replacing a fossil fuel heating system. Oil counts. Gas counts too, but oil homes have a stronger financial case because oil running costs are higher and the tank takes up garden space you get back.

Over 100,000 BUS applications have been submitted since the scheme launched. 97% are for air source heat pumps. The grant is applied at the point of installation, so you never pay the full price.

4. No insulation requirement since January 2026

Previously, you had to complete all EPC-recommended insulation measures before applying for a heat pump grant. As of January 2026, that requirement has been removed. You still need a valid EPC, but you no longer have to insulate first. This removes one of the biggest barriers that stopped oil-heated homeowners from switching.

5. Interest-free loans are coming for solar

The Warm Homes Plan, announced in January 2026, includes government-backed interest-free or low-interest loans for solar panels, batteries, and heat pumps. These are available to all households, not just low-income. You can use them alongside the BUS grant. The details are still being finalised, but the direction is clear: the government wants oil-heated homes off oil.

The numbers: oil vs solar + heat pump

Take a typical oil-heated detached house in Devon. 3 bedrooms, 100m², EPC rating D. Using around 20,000 kWh of oil per year for heating and hot water.

Based on 20,000 kWh heating demand, 2,700 kWh non-heating electricity, oil at 58p/litre (effective ~7p/kWh usable), electricity at 24.67p/kWh (Ofgem Q2 2026), heat pump COP 3.0-3.5, 4kWp south-facing solar system generating ~4,000 kWh/yr, 50% self-consumption. These are estimates. Your property, location, and usage will differ.

That is a saving of £1,200 to £1,600 per year. With the BUS grant covering £7,500 of the heat pump cost, your out-of-pocket for both solar and a heat pump is roughly £8,000 to £12,000. At those savings, the combined payback is 6 to 8 years.

The practical order: solar first, heat pump second

You do not have to do both at once. In fact, doing them in stages is often easier.

Stage 1: Solar panels. Cost: £6,000 to £8,000 installed. No changes to your existing oil boiler. Starts saving immediately on electricity bills. Payback: 8 to 10 years. If you add a solar immersion diverter (~£250), surplus electricity heats your hot water tank during the day, reducing oil use in summer.

Stage 2: Heat pump (when your boiler needs replacing). Cost: £12,000 to £15,000 minus £7,500 BUS grant = £4,500 to £7,500 out of pocket. Your solar panels now power your heating too. Running costs drop dramatically.

This staged approach means you never face a single large bill. And if your oil boiler has a few years of life left, you get the solar savings in the meantime.

When this does not work

Solar panels are not right for every oil-heated home. The numbers fall apart if:

• Your roof faces north or is heavily shaded by trees
• You are planning to move within the next 3 to 4 years
• Your home is a listed building where planning permission for panels may be refused
• Your roof needs replacing soon (do the roof first, then add panels)

For heat pumps specifically, very old, poorly insulated stone houses may need significant fabric upgrades before a heat pump can maintain comfortable temperatures. This is worth getting assessed properly. An MCS-certified installer will do a heat loss calculation as part of the quote.

Where oil homes are in England and Wales

We analysed EPC data across multiple local authorities. Oil heating is most common in rural areas where the gas grid does not reach.

Based on our analysis of EPC data from the MHCLG EPC Open Data Register. Off-gas total includes electric, oil, and LPG-heated properties. Sample: 5,000 properties per area.

East Devon stands out: 18% of properties use oil, and another 20% use electric heating. Combined with south coast solar irradiance, this is one of the best areas in England for the solar-then-heat-pump pathway.

The price volatility argument

If you have oil heating, you already know what price volatility feels like. In January 2020, heating oil was 35p per litre. By June 2022, it was 99p. It has since come back down to around 58p, but nobody knows where it will be next winter.

Solar panels and a heat pump replace that uncertainty with a fixed cost. Once installed, your electricity comes from your roof (free) and the grid (price-capped by Ofgem). You are no longer exposed to OPEC production decisions, Middle East tensions, or winter demand spikes.

That predictability has a value beyond the numbers. It means you can budget for energy like any other household bill, instead of watching oil prices and trying to time your next delivery.

What to do next

If you have oil heating, start by checking what the data says about your property. We pull your EPC rating, heating system, and solar potential from government data and calculate property-specific savings.

Already know your property? Read our full solar guide for more on installation, MCS certification, and choosing an installer. Or see our full breakdown of whether solar panels are worth it.