# Heat Pump vs Gas Boiler: Which Heating System Is Best?

> Compare heat pumps and gas boilers on cost, running costs, lifespan, CO2 emissions, and more. Find out which heating system suits your home.

Canonical: https://renoquant.com/heat-pump-vs-gas-boiler
Prices updated: 2026-03

## Heat Pump vs Gas Boiler: A Detailed Comparison

The decision between a heat pump and a gas boiler affects your heating bills, carbon footprint, and home value for the next 15-20 years. This guide compares both systems on every metric that matters so you can make an informed choice.

### How They Work

A **gas boiler** burns natural gas to heat water, which is circulated through radiators or underfloor heating. Modern condensing boilers recover heat from exhaust gases, achieving 90-95% efficiency. For every kWh of gas burned, you get 0.90-0.95 kWh of heat.

A **heat pump** extracts heat from outdoor air (or the ground) and concentrates it to heat water. It uses electricity to drive a compressor, but delivers 2.5-4 times more heat energy than the electrical energy it consumes. For every kWh of electricity used, you get 2.5-4 kWh of heat.

### Cost Comparison Over 15 Years

| Cost Item | Heat Pump | Gas Boiler |
|-----------|-----------|------------|
| Installation | EUR 11,000 | EUR 3,000 |
| Grant deduction | -EUR 5,000 | EUR 0 |
| Net installation cost | EUR 6,000 | EUR 3,000 |
| Annual running cost | EUR 1,225 | EUR 1,010 |
| Annual maintenance | EUR 150 | EUR 100 |
| Replacement at year 12-15 | EUR 0 | EUR 3,000 |
| **15-year total** | **EUR 26,625** | **EUR 19,650** |

*Based on 100 sqm home, 14,000 kWh annual heating demand. Gas boiler needs replacement at year 12.*

With current energy prices and grants, a gas boiler is still cheaper over 15 years for homes already connected to the gas grid. However, if gas prices rise by 5% annually (as many forecasts predict), the heat pump becomes cheaper from year 10 onwards. Use our [heat pump calculator](/heat-pump-calculator) to see the comparison for your specific home.

### Environmental Comparison

| Metric | Heat Pump | Gas Boiler |
|--------|-----------|------------|
| CO2 per kWh of heat | 0.070-0.095 kg | 0.215-0.240 kg |
| Annual CO2 (14,000 kWh demand) | 1,300-1,700 kg | 3,350-3,750 kg |
| CO2 reduction vs gas | 55-65% | Baseline |
| Lifetime CO2 (20 years) | 26-34 tonnes | 67-75 tonnes |

A heat pump cuts CO2 emissions by over half compared to a gas boiler. As electricity grids become greener (more wind and solar), the heat pump's carbon footprint will decrease further. Gas emissions remain constant. Countries like France (80% nuclear electricity) see even larger CO2 reductions from heat pumps.

### Which Homes Suit Each System?

**Heat pump is ideal for**: Well-insulated homes (post-2000 or retrofitted), homes with underfloor heating, properties replacing oil or LPG (biggest savings), new builds, and homes with solar panels. Check your [insulation level](/insulation-calculator) before deciding.

**Gas boiler is better for**: Homes needing urgent replacement on a tight budget, very poorly insulated homes where heat pump sizing becomes impractical, homes without space for an outdoor unit, and properties in conservation areas where planning permission may be difficult.

### The Hybrid Option

A hybrid system combines a heat pump with a gas boiler backup. The heat pump runs most of the time (handling 80-90% of heating hours), and the gas boiler kicks in only during the coldest days. This approach reduces the required heat pump size, lowers installation cost, and still cuts CO2 by 50-60%. Hybrids are a practical stepping stone for homes that are not yet ready for a full heat pump installation.

## Frequently Asked Questions

### Is a heat pump better than a gas boiler?

Heat pumps are better for the environment, have lower long-term running costs, and last longer. Gas boilers are cheaper to install and work well with existing radiator systems. The best choice depends on your home's insulation, budget, and how long you plan to stay in the property.

### Can a heat pump heat a home as well as a gas boiler?

Yes. A correctly sized heat pump heats a home just as effectively as a gas boiler. The difference is that heat pumps produce lower-temperature water (35-55C vs 60-80C), so they work best with underfloor heating or larger radiators that emit the same heat at lower temperatures.

### Are heat pumps noisy?

Modern air source heat pumps produce 40-55 dB at 1 metre distance, similar to a quiet conversation or a refrigerator. They are installed outdoors, so indoor noise is minimal. Ground source heat pumps are virtually silent. Planning rules require placement at least 1 metre from a boundary.

### What happens to a heat pump during a power cut?

Heat pumps stop during a power cut, just like a gas boiler (which also needs electricity for the pump and controls). A battery backup or generator can keep a heat pump running during outages. Some hybrid systems include a backup gas or electric element for extreme situations.

### Will a heat pump increase my home's value?

Yes. Research shows homes with heat pumps sell for 3-5% more than comparable properties with gas heating. As gas boiler sales are banned in new builds across Europe, heat pumps are increasingly seen as a modern, desirable feature by homebuyers.

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Interactive version with calculator: https://renoquant.com/heat-pump-vs-gas-boiler. Figures are estimates; final quotes vary by site conditions, materials, and region.