Free tool
Boiler & Heating Cost Calculator
Estimate your annual and monthly heating costs based on your home, system and tariffs.
Instant estimate
Your home
Your system
Electric assumes near 100% point-of-use efficiency.
Typical: 80–92% (modern condensing often 88–92%).
Scales the heating demand up/down.
Tariffs & assumptions
Auto-set from household size (you can override).
Approximate; varies over time.
Estimates only. Real costs vary with insulation, controls, weather and tariff changes.
Your estimate
Annual cost
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Monthly cost
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Annual energy
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CO₂ (annual)
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Tip: Improving insulation and controls often saves more than upgrading the boiler alone.
Want a more accurate figure?
We can sanity-check your system and show you practical ways to reduce bills — often without “just fitting a bigger boiler”.
- Efficiency tweaks: controls upgrades, smart thermostats, TRVs, zoning & scheduling.
- System improvements: balancing, radiator sizing advice, circulation checks, hot water optimisation.
- Boiler guidance: repair vs upgrade, right-sizing, condensing performance, realistic running costs.
- Comfort fixes: cold spots, slow warm-up, noisy radiators, inconsistent hot water.
Good to know: we’ll include your calculator summary so our engineer already has the basics.