Heat pump or gas boiler? The biggest home purchase decision most people rarely think about, until the old system fails. This guide compares them on cost, emissions, reliability, and long term economics to help you decide in 2026.
Quick answer
Head to head
| Attribute | Modern heat pump | Gas boiler |
|---|---|---|
| Upfront cost (typical) | USD 12,000 to 25,000 installed | USD 4,000 to 8,000 installed |
| Operating cost per BTU | Lower in most markets | Higher in most markets |
| Emissions per BTU | 25 to 60% lower (grid dependent) | Baseline high |
| Efficiency | COP 2.5 to 5 | 90 to 98% AFUE |
| Provides cooling | Yes | No (need separate AC) |
| Lifetime | 15 to 20 years | 15 to 25 years |
| Maintenance | Low; annual service | Low; annual service |
How heat pumps work
A heat pump moves heat rather than creating it. Refrigerant loop with outdoor unit (evaporator) and indoor unit (condenser). In winter, extracts heat from outdoor air (or ground) and delivers indoors. In summer, reverses to provide cooling. Uses electricity to run compressor, but delivers 2.5 to 5 units of heat per unit electricity.
Types of heat pumps
| Type | Notes |
|---|---|
| Air source (ASHP) | Most common. Uses outdoor air. |
| Cold climate ASHP | Optimised for climates below minus 15 C. |
| Ground source (GSHP) | Uses ground temperature. Higher CAPEX, higher efficiency. |
| Mini split (ductless) | Individual room heat pumps. No ducts needed. |
| Ducted central | Uses existing air ducts. |
| Hybrid dual fuel | Heat pump plus gas backup for extreme cold. |
Operating cost comparison
| Fuel | USD per million BTU delivered |
|---|---|
| Heat pump (COP 3, USD 0.12/kWh) | ~USD 12 |
| Heat pump (COP 3, USD 0.30/kWh California) | ~USD 29 |
| Gas boiler (95% AFUE, USD 15/MMBtu) | ~USD 16 |
| Gas boiler (95% AFUE, USD 8/MMBtu Texas) | ~USD 8 |
| Electric resistance (USD 0.12/kWh) | ~USD 35 |
| Fuel oil boiler | ~USD 30 |
Lifecycle emissions
Emissions comparison depends on local grid mix. Regions with clean electricity grids favour heat pumps decisively; regions with coal heavy grids narrower advantage. Grid gets cleaner every year, improving heat pump case over time.
| Region | Emissions advantage of heat pump |
|---|---|
| Pacific Northwest, Norway | Massive (80 to 95%) |
| California, France, UK | Substantial (60 to 80%) |
| Northeast US, Germany | Meaningful (30 to 50%) |
| Coal heavy grids (parts of Australia, India) | Small or none currently |
Cold climate performance
Incentives
| Programme | Value |
|---|---|
| US IRA 25C tax credit | Up to USD 2,000 for qualifying heat pumps |
| US IRA HEEHRA rebate | Up to USD 8,000 for low income households |
| State rebate programmes | USD 500 to 5,000 typical |
| Utility rebates | Varies USD 300 to 2,000 |
| UK Boiler Upgrade Scheme | Up to GBP 7,500 |
| EU heat pump support programmes | Varies by member state |
When heat pump wins
- You need cooling anyway.
- Grid is relatively clean or moving that way.
- Electricity rates reasonable.
- Well insulated home.
- Available incentives.
- Cool moderate climate.
- Older gas boiler failing.
- Want to future proof.
When gas boiler still wins
- Very cold climate (below minus 25 C common).
- Existing gas connection with cheap gas.
- Electricity very expensive.
- Home very poorly insulated.
- Limited budget for upfront.
- Radiator based heating system.
- No cooling needed.
The hybrid option
Dual fuel system uses heat pump for most heating with gas backup for extreme cold. Best of both worlds but higher CAPEX. Common in cold climates as transition strategy.
Ductwork considerations
Existing forced air ducts work with ducted heat pump. Radiator or baseboard system needs mini splits or new distribution. Adds cost and complexity. Boiler more compatible with existing hydronic systems.
Choosing an installer
If you need cooling too
Comparison changes significantly if you need cooling. Heat pump provides both heating and cooling in one system. Gas boiler requires separate AC. Combined cost of gas boiler plus new AC often equals or exceeds heat pump total.
Water heating heat pumps
Separate heat pump water heaters achieve COP 2.5 to 3.5. Increasingly cost effective replacement for electric or gas water heaters. Consider alongside space heating decision.
Where heating is going
- Continued heat pump improvement.
- Growing incentive programmes.
- Gas connection restrictions in some jurisdictions.
- Renewables continued grid integration.
- Building code updates favouring heat pumps.
- Hydrogen heating research (limited scale currently).
Frequently asked questions
Do heat pumps work in cold climates?
Modern cold climate heat pumps work to minus 25 C or lower.
Are heat pumps more expensive?
Higher upfront. Often lower lifetime total cost.
Do heat pumps use a lot of electricity?
Depends on climate. COP 3 means 1 unit electricity delivers 3 units heat.
Can I keep my existing ducts?
Usually yes for ducted heat pump.
Do I need three phase power?
Some larger heat pumps yes. Residential typically single phase.
Are heat pumps noisy?
Outdoor unit produces some noise. Location matters.
What about maintenance?
Annual service similar to boiler.
Should I convert from oil?
Very often yes. Oil boilers most expensive to run.
What about hybrid?
Good option in cold climates or where electricity expensive.
Where can I read more?
Local heat pump installer, ACEEE, national heat pump association.
Summary
Modern heat pumps beat gas boilers on emissions and often on total cost in most climates. Higher upfront cost offset by lower operating cost and available incentives. Cold climate performance is now good but verify specifications. Ductless mini splits provide flexibility for homes without central ducts. Hybrid dual fuel systems bridge extreme cold. Consider grid mix, electricity rates, gas rates, existing infrastructure, and cooling needs before deciding.
Next reading
- Geothermal heating for buildings
- District heating
- How to read your electric bill
- Rooftop solar complete guide
See the assets in this article
Explore 177,000+ utility infrastructure sites
Locations, capacity, operators, and permits across 24 sectors: the same records our writers pull from.
Start browsingOperations guides from the UtilityRadar team.