Boiler vs Heat Pump Calculator
Compare running costs of a traditional gas boiler versus a heat pump. See the long-term financial impact.
Boiler vs Heat Pump Calculator
Affects heat pump efficiency (COP)
Your current annual bill
Annual Saving
£1078.13
with heat pump
Carbon Reduction
8873
kg CO2 per year
Payback Year
3
approximate
Gas Boiler
Installation Cost
£2500.00
Annual Costs
Key Specs
- Efficiency: 90%
- Lifespan: 15 years
- Emissions: 9000 kg CO2/year
- Maintenance: Annual service required
Air Source Heat Pump
Installation Cost
£13000.00
£5500.00 net
Annual Costs
Key Specs
- COP (efficiency): 3.2
- Lifespan: 25 years
- Emissions: 127 kg CO2/year
- Maintenance: Minimal (annual check-up)
10-Year Total Cost Comparison
Heat pump saves £8281 over 10 years
Gas Boiler Pros & Cons
Pros
- Lower upfront cost
- Proven, familiar technology
- No disruption to install
- Works with existing radiators
- Fast heat-up, instant hot water
Cons
- Rising gas prices (5-15% per year)
- High carbon emissions
- Needs annual maintenance
- Boiler replacement needed every 15 years
- Vulnerable to future fuel taxes/bans
Heat Pump Pros & Cons
Pros
- Lower running costs (30-50% cheaper)
- Minimal maintenance required
- 25-year lifespan (longer than boiler)
- Low carbon emissions (grid-dependent)
- Works with solar for zero-cost heat
- Future-proofs against fuel bans
- Eligibility for BUS grant (£7,500)
Cons
- Higher upfront cost (£10-13k)
- Needs outdoor unit space
- Slightly lower comfort in very cold weather
- Requires quality insulation for best results
- Slightly longer heat-up time
Which Should You Choose?
Choose Gas Boiler if:
- You need the lowest upfront cost
- You plan to move in 5-7 years
- Your property is poorly insulated
- Space is very limited for outdoor unit
Choose Heat Pump if:
- You plan to stay 10+ years
- Your property is well insulated (or you'll improve it)
- You want lower running costs and carbon emissions
- You have space for outdoor unit
- You're eligible for BUS grant
- You already have or plan solar panels
💡 Best Approach
- Improve insulation first: Better insulation increases heat pump efficiency and reduces costs
- Check BUS grant eligibility: You may qualify for £7,500 towards heat pump
- Get multiple quotes: Prices vary significantly between installers
- Consider timing: Older boilers (10+ years) are good replacement candidates
- Combine with solar: Heat pump plus solar panels = near-zero heating costs
- Plan for the long term: Gas will likely be phased out by 2035
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