Comparison
Heat pump vs boiler
One heats water and sends it through pipes. The other moves heat from outside air or the ground.
Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking
The short answer
A boiler heats water and circulates it to radiators, baseboards or floor loops. A heat pump moves heat from outdoor air or the ground into the house, usually as warm air, and also cools in summer.
Switching from a boiler to a heat pump is rarely a straight swap: the house may need ducts or ductless heads, or an air-to-water heat pump that can feed the existing pipes at lower temperatures.
How does each one heat the house?
A boiler burns gas or oil, or uses electric elements, to heat water. A pump circulates the hot water through radiators, baseboard or in-floor tubing. The heat is quiet and even, and there is no ductwork. Boiler efficiency is rated as AFUE.
An air-source heat pump uses a refrigerant cycle to gather heat outside and release it indoors. Most US models deliver warm air through ducts or ductless indoor heads. Air-to-water heat pumps also exist and can feed a hydronic system, but they deliver water at lower temperatures than a typical boiler.
Heat pump vs boiler at a glance
| Heat pump | Boiler | |
|---|---|---|
| Heat delivery | Warm air (or low-temperature water) | Hot water or steam through pipes |
| Cooling | Yes | No; needs separate AC |
| Fuel | Electricity | Gas, oil or electricity |
| Efficiency rating | HSPF2 (heating), SEER2 (cooling) | AFUE |
| Ducts | Ducted or ductless | None |
| Combustion safety | None from the unit | Fuel-fired boilers need venting and CO alarms |
What changes if you replace a boiler with a heat pump?
Three things decide whether it works. First, delivery: radiators sized for hot boiler water may not heat the room with cooler water from an air-to-water heat pump, so some rooms may need larger emitters.
Second, cold-weather output: the heat pump must hold enough capacity at your design temperature, or have backup. Third, cooling: if you add ductless heads you gain air conditioning, which a boiler never gave you.
Many owners keep the boiler and add ductless heat pumps for cooling and shoulder-season heat. The boiler then covers the coldest days.
What drives the cost is the delivery system you choose, the number of zones and whether the electrical panel can take the load. We publish no prices here: we do not yet hold enough sourced, dated quotes to state one honestly. Use the cost hub and the HVAC cost calculator with your own quotes.
Where each one wins
A boiler wins when
The hydronic system is in good shape and you like radiant heat.
Winters are very cold and fuel prices are favorable.
You do not need cooling or already have it.
A heat pump wins when
You want cooling and heating from one system.
Your boiler burns oil or propane, which is often expensive per unit of heat.
You want to remove combustion from the house.
What about running both together?
A hybrid arrangement is common in older homes with good boilers. Ductless heat pump heads handle cooling in summer and most heating in spring and autumn, when outdoor temperatures are mild and a heat pump works at its best.
The boiler stays in place and takes over on the coldest days, when heat pump output falls. This avoids replacing a working hydronic system while still adding air conditioning and cutting fuel use in the milder months.
The controls need care so the two systems do not fight each other; ask the installer how the thermostats will be set up and which system runs first.
Before you decide, ask
A Manual J calculation shows whether a heat pump can cover each room.
This decides whether an air-to-water heat pump can reuse them.
Fuel-fired boilers need regular combustion and vent checks by a licensed pro.
Questions
Can a heat pump replace a boiler?
Can I keep my radiators with a heat pump?
Is a boiler more comfortable than a heat pump?
Which costs less to run?
Do I need AC with a boiler?
Written and audited by
HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.
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