Heat pump vs boiler running cost depends mainly on local electricity and fuel prices, system efficiency, and how much heat a home needs. For a typical U.S. home, seasonal heating bills can range from about $600 to $2,400 for either system, though a heat pump often costs less where electricity is moderate and winters are mild.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Heat pump seasonal heating | $600 | $1,200 | $2,400 | Roughly 40-80 million Btu of delivered heat |
| Gas boiler seasonal heating | $550 | $1,250 | $2,300 | Assumes 85%-95% efficiency |
| Heat pump cost per delivered heat | $12 per million Btu | $17 | $30 | Varies with electricity rate and seasonal efficiency |
| Gas boiler cost per delivered heat | $9 per million Btu | $16 | $27 | Varies with gas price and boiler efficiency |
Typical winter bills for heat pumps and boilers
For a fair comparison, annual bills should reflect the same home and amount of heat delivered. A heat pump using 2,000-6,000 kWh for space heating could cost about $320-$1,500 at electricity rates of $0.16-$0.25 per kWh. A gas boiler delivering similar heat may use around 450-900 therms, costing roughly $500-$1,800 at $1.10-$2.00 per therm.
At common U.S. energy prices, neither system is automatically cheaper; local rates and seasonal efficiency determine the result. The ranges assume a reasonably insulated home, ordinary thermostat settings, and no unusually high fuel delivery or utility charges. Cold-climate heat pumps, inefficient boilers, and poorly insulated houses can fall outside them.
Assumptions: Annual heating demand of 40-80 million Btu delivered, standard residential rates, and routine system operation.
Electricity, gas, and service charges in each bill
Operating cost is more than the equipment’s advertised efficiency. A heat pump’s bill includes electricity for the outdoor compressor, indoor fan, and any resistance backup. A boiler uses fuel for the burner and electricity for pumps and controls; oil and propane boilers also carry fuel-delivery costs. Fixed utility fees may remain even if heating use drops.
| Running-cost item | Heat pump estimate | Boiler estimate | What changes it |
|---|---|---|---|
| Primary energy | $0.16-$0.25 per kWh | $1.10-$2.00 per gas therm | Utility and fuel market |
| Seasonal delivered heat | $12-$30 per million Btu | $9-$27 per million Btu | Efficiency and local rates |
| Routine service | $100-$250 yearly | $150-$350 yearly | Inspection, cleaning, and local labor |
| Backup or delivery expense | $0-$600 yearly | $0-$500 yearly | Cold snaps or propane and oil delivery |
Service estimates represent maintenance, not major repairs. A boiler’s annual inspection may include burner cleaning and combustion checks. Heat pump upkeep commonly includes coil inspection, filter changes, and refrigerant-system checks. Comparisons should include fixed fees and maintenance only when they differ between options.
How electricity rates and seasonal COP shift heat costs
A heat pump’s seasonal coefficient of performance (COP) measures delivered heat relative to electricity used. At a $0.18 per kWh rate and seasonal COP of 3, delivered heat costs about $17.60 per million Btu. At COP 2, the same rate produces a cost near $26.40. A 90%-efficient gas boiler at $1.50 per therm costs about $16.70 per million Btu, before fixed fees.
This estimates dollars per million Btu from electricity; for a gas boiler, divide the therm price by boiler efficiency and multiply by 10.02. For example, $1.50 per therm at 90% efficiency is about $16.70 per million Btu delivered.
Small rate or performance changes can reverse which system has the lower operating cost. A heat pump with COP 3 generally beats a $1.50-per-therm boiler on energy cost when electricity is below roughly $0.17 per kWh; the break-even point moves with efficiency and fuel prices.
Cold-climate regions can change the annual comparison
In mild regions, a heat pump may retain high efficiency for much of winter, while homes with low heating demand may see modest savings in dollars. In very cold areas, heat pump costs can rise 10%-40% compared with mild-weather operation if lower temperatures reduce efficiency or trigger electric resistance backup. Actual impact depends on equipment design, sizing, insulation, and temperature settings.
Gas boiler bills also vary by region: colder climates use more fuel, while gas availability and utility rates differ across states. Where natural gas is unavailable, propane or heating oil can cost substantially more per delivered unit of heat; propane boiler fuel may run about $20-$40 per million Btu, and heating oil about $18-$35. Compare local delivered fuel prices, not just national averages.
Resistance backup and boiler fuel type affect peak bills
When outdoor temperatures fall below a heat pump’s efficient operating range, supplemental resistance heat can use electricity at close to a 1:1 heat ratio. At $0.18 per kWh, that is about $53 per million Btu—far above heat pump operation at COP 3. A properly configured cold-climate unit can reduce this exposure, but its performance depends on the model and the home’s heat loss.
Boiler fuel also matters. Natural gas is often the least expensive boiler option, but propane and oil can be much costlier, especially where delivery fees or minimum tank fills apply. Boiler efficiency typically ranges from 80%-95%; older units near the lower end need more fuel for the same indoor temperature. Check the fuel type and backup setting before comparing winter bills.
Three heating scenarios show the cost difference
| Home and assumptions | Heat pump estimate | Boiler estimate | Likely lower bill |
|---|---|---|---|
| Moderate winter, 50 million Btu; electricity $0.16/kWh, COP 3.2; gas $1.40/therm, 90% | About $730 | About $780 | Heat pump by about $50 |
| Cold winter, 70 million Btu; electricity $0.20/kWh, COP 2.3; gas $1.50/therm, 90% | About $1,790 | About $1,170 | Gas boiler by about $620 |
| High gas price, 45 million Btu; electricity $0.15/kWh, COP 3; gas $2.00/therm, 90% | About $650 | About $1,000 | Heat pump by about $350 |
These illustrative energy-only estimates exclude fixed charges, service, and backup-fuel use. They use delivered heat divided by system efficiency, so they are not predictions for every house. A home’s actual heat demand can matter more than a small difference in equipment efficiency.
Lower bills with controls, insulation, and rate checks
Reducing heat loss cuts fuel or electricity use regardless of system. Sealing drafts, insulating accessible attic areas, and correcting duct leaks can reduce heating demand; results depend on the starting condition, and major insulation work may have a separate upfront cost. Avoid large thermostat setbacks if recovery triggers expensive resistance backup on a heat pump.
Compare utility plans and time-of-use rates before changing equipment settings. Heat pump owners can ask whether the system is configured to limit backup heat and whether the thermostat’s balance point suits the local climate. Boiler owners can check operating settings and schedule burner maintenance rather than raising water temperature without a reason.
For a useful quote comparison, request estimated annual energy use, the assumed utility rates, and expected backup operation. Comparing those figures alongside a year of bills is more dependable than comparing equipment efficiency labels alone.