Boiler vs air source heat pump: a factual comparison
A boiler burns fuel to produce high-temperature water quickly; a heat pump extracts heat from outside air and works most efficiently delivering water at a lower, steadier temperature. That single difference drives most of the practical comparison.
Boilers and air source heat pumps explained in plain terms
Heat pumps generally need larger radiators or underfloor heating to deliver the same room temperature at a lower flow temperature, and perform best in a well-insulated property. Boilers respond quickly to demand and are largely unaffected by external air temperature. A proper heat loss survey is the only reliable way to judge whether a given property and radiator set-up suits a heat pump without extensive changes.
Practical notes on boilers and air source heat pumps
- Heat pumps work most efficiently at lower flow temperatures
- Existing radiators are often undersized for heat pump operation
- Boilers reach high flow temperatures quickly regardless of outside air
- Insulation standard strongly affects heat pump suitability
- A heat loss survey should precede any switch decision
Where we deal with this
Relevant registrations
- Gas Safe registered for domestic gas boiler work
- OFTEC registered for oil boiler work
- Worcester Bosch Accredited Installer
Straight answers on boilers and air source heat pumps
Our advice: The comparison hinges on your property's insulation and radiator sizing, not on the technology alone.
Jamie Crawford Heating is based at 24 Bristol Road, Radstock, BA3 3EE.
Related help pages
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- Pipework comparisonPlastic vs copper pipework for heating and hot water
- Radiator layout comparisonOne large radiator vs two smaller radiators in the same room
- Installation comparisonLike-for-like boiler swap vs a full system upgrade
- Gas safetyGas tightness testing: how a suspected leak is actually checked
- Property typeHeating Georgian townhouses: tall rooms, long runs, old routes
Services that cover this
Questions we get asked
- Will my existing radiators work with a heat pump?
- Some will, but many need enlarging or supplementing — a heat loss survey confirms this room by room.
- Is a heat pump always more efficient?
- It depends on the property's insulation and the flow temperature the system needs to run at.
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