We are half way through 2025 and more UK households are still asking which is best – heat pump vs boiler:
Should I stick with a gas boiler, or switch to a heat pump?
With energy prices fluctuating, new government targets, and increasing awareness of climate impact, understanding the pros and cons of each heating system has never been more important.
In this heat pump vs boiler guide, I’ll break down the real-world pros, cons, and costs — not just the marketing fluff — to help you decide what’s right for your home.
Heat Pump vs Boiler: How Do They Work?
- Boilers burn gas or oil to heat water, which is pumped through your radiators and taps.
- Heat pumps extract energy from the air or ground and transfer it indoors, even when it’s cold outside.
Both systems heat your home and water – but how they do it? (and what it costs you long-term) is where the differences lie.
Running Costs: Heat Pump vs Boiler
| Feature | Heat Pump | Gas Boiler |
|---|---|---|
| Efficiency | 300-400% (COP 3–4) | ~90% (best case) |
| Average yearly cost (3-bed home) | ~£600–£1,200 | ~£900–£1,500 |
| Maintenance | Annual service (~£150) | Annual service (~£100) |
| Lifespan | 15–20 years | 10–15 years |
While a boiler might cost less upfront, heat pumps often win over time – especially if paired with solar panels or off-peak electricity tariffs.
Carbon Emissions & Environmental Impact
Boilers burn fossil fuels, so even the most efficient models produce CO₂.
Heat pumps, on the other hand, don’t generate heat—they move it, meaning they can slash your home’s emissions by up to 65%, especially if powered by renewable electricity.
If you’re planning to go greener in 2025, a heat pump is the obvious winner here.
Installation & Home Compatibility
| Factor | Heat Pump | Boiler |
|---|---|---|
| Install time | 2–5 days | 1–2 days |
| Radiator compatibility | May need upgrading | Works with current |
| Outdoor space | Required (for air/ground unit) | Not required |
| Insulation requirement | Well-insulated homes perform better | Works in most homes |
If you live in a well-insulated, modern home, a heat pump is ideal. Older homes can still work, but may need radiator or insulation upgrades.
Upfront Costs & Government Help (2025)
- Heat Pump Installation: £7,000 – £13,000
- Gas Boiler Replacement: £2,000 – £4,000
Remember the Boiler Upgrade Scheme Government Grant
The Boiler Upgrade Scheme offers up to £7,500 off air source heat pump installations (check eligibility: Ofgem Boiler Upgrade Scheme)
So, Which Should You Choose? Heat Pump vs Boiler
Go for a Heat Pump if:
- You want lower long-term bills
- You’re planning to stay in your home for years
- Your home is well insulated or you’re open to upgrades
- You want to reduce your carbon footprint
Stick with a Boiler if:
- Budget is very limited upfront
- You’re in a poorly insulated or listed building
- You’re not planning to stay in your home long-term
Final Thoughts
There’s no one-size-fits-all answer, but in 2025, the tide is turning toward heat pumps – especially for forward-thinking homeowners looking to futureproof their property, reduce bills, and cut carbon.
Before making a decision, always speak to a qualified installer who can carry out a proper heat loss survey and discuss the best option for your specific needs.
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