Oil Boiler Replacement Calculator.

A product experiment from Like So

Current Oil Heating

2,000 L
UK average home: 1,500–2,500 litres/year. Check your delivery records.
Between 28 Feb and 6 Mar 2026 oil prices to UK households increased dramatically.
133p/L
Current UK domestic kerosene price ~133p/litre (March 2026).
82%
Older conventional boiler: 70–85%. Newer condensing: 88–92%.

Air Source Heat Pump

£14,000
Typical UK supply & install: £10,000–£20,000 depending on home size.
2.8
Typical well-installed UK ASHP: 2.5–3.5. Higher with underfloor heating.
24p/kWh
UK price cap ~24–28p/kWh. EV/heat pump tariffs can be lower.
Boiler Upgrade Scheme grant (£7,500)
—
Current oil cost / yr
—
ASHP running cost / yr
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Annual saving
—
Net install cost (after grant)
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Simple payback
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CO₂ saved / yr

Annual Running Cost Comparison

Oil boiler (today)
£—
ASHP (running cost)
£—

Payback Summary

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10-Year Cumulative Cost

Year Oil boiler total (£) ASHP total (£) ASHP saves (£)

This is a product experiment from the team at Like So. We build products and services that create value for clients and accelerate the energy transition. Get in touch — hello@likeso.studio

Assumptions & notes: Oil calorific value: 10.35 kWh/litre (kerosene). Oil CO₂ factor: 2.54 kg/litre. Electricity CO₂ factor: 0.207 kg/kWh (UK grid 2024 average). Boiler Upgrade Scheme: £7,500 grant for ASHP installations in England & Wales — check gov.uk for eligibility. ASHP running costs assume consistent COP throughout the year (actual performance varies seasonally). Maintenance costs for both systems are not included. Prices and grants may change. This calculator is for illustrative purposes — always get quotes from MCS-certified installers.