With the government pushing for Net Zero, heat pumps are the hot topic. But are they actually ready to replace your trusty gas combi boiler? The answer depends largely on your home.
How They Work
Gas Boilers burn fuel to create heat instantly at high temperatures
(70-80°C).
Heat Pumps extract warmth from the outside air (even when it's cold!) and
compress it. They run at lower temperatures (35-50°C).
The Main Difference: "Low Flow"
Because heat pumps run cooler, they need much larger radiators or underfloor heating to warm a room effectively. If you just swap a boiler for a heat pump without upgrading your radiators, your house will likely feel cold.
Comparison at a Glance
| Feature | Gas Boiler | Heat Pump |
|---|---|---|
| Installation Cost | Low (£2k-£4k) | High (£10k-£15k) |
| Running Costs | Moderate | Low (if efficient) |
| Insulation Needed | Standard | High / Excellent |
Which is Right for You?
If you live in a modern, well-insulated home (EPC C or above) or are doing a major renovation with underfloor heating, a heat pump is a fantastic, future-proof choice.
However, for most older UK homes with standard insulation, a modern, hydrogen-blend ready condensing gas boiler is often still the most cost-effective and practical solution for now.