How to Cut Your Heating Costs by Switching Fuels in 2026
Switching heating fuels could save hundreds annually. Here's how to compare oil, gas, pellets and electricity to find your cheapest option.
Your heating fuel choice directly impacts your annual bills. With energy prices volatile and technology improving, now is the time to compare what's available to your home.
Compare Your Current Costs
Start by calculating what you're actually paying per kilowatt-hour (kWh). This strips away unit sizes and makes fuels directly comparable:
* Mains gas: 6.04p/kWh (Ofgem cap)
* Electricity: 24.5p/kWh (Ofgem cap)
* Heating oil: 94p/litre ÷ roughly 10.5 kWh per litre = 8.9p/kWh
* Wood pellets: 7.2p/kWh
If you're on electricity, switching to gas, oil, or pellets could cut costs significantly. If you're burning oil at current prices, pellets offer a 7% saving on unit cost alone.
Know Your Home's Fuel Options
Mains gas remains the cheapest if your property is connected. Compare mains gas suppliers to ensure you're on the best rate.
Heating oil suits rural homes without gas access. Prices fluctuate with global markets, so comparing oil suppliers regularly protects you from overpaying. Consider joining a buying group to negotiate better bulk rates.
Wood pellets work only with compatible boilers, but deliver the lowest per-unit cost. Installation requires space for bulk storage. If you have an old wood-burning stove, upgrading to a pellet stove or boiler is now simpler with improved models available.
Electricity is most expensive for heating but improves when paired with heat pumps, which can deliver 3-4x the energy input as heat output. Compare electricity rates if you're considering this technology.
Take Action This Week
1. Check your boiler type. Your current fuel determines what you can realistically switch to. Switching from oil to gas requires mains connection or new infrastructure.
2. Calculate your annual consumption. Find your kWh total on recent bills. Multiply by the per-unit costs above to project annual spend under each fuel.
3. Request quotes from suppliers. Most offer free assessments for conversions. Budget £1,500–£3,000 for boiler upgrades.
4. Check installation timelines. Switching fuels takes weeks to months. Plan work for spring or summer when heating demand is lowest.
Don't Overlook the Details
The cheapest fuel per kWh isn't always the cheapest option overall. Account for:
* Fixed costs: Standing charges and installation fees
* Boiler efficiency: Newer models extract more heat per unit of fuel
* Maintenance: Oil and pellets need more upkeep than gas
* Storage requirements: Rural properties need space for oil tanks or pellet silos
Switching fuels is a long-term commitment worth careful planning. Run the numbers, compare your options, and prioritize reliability alongside price.