Types of Air Source Heat Pump
The different types of air source heat pump explained in plain English, and how to choose the right one for your home.
- Last reviewed: July 2026
- Reading time: 5 minutes
Key takeaway
Air-to-water heat pumps suit most UK homes with radiators, while air-to-air systems warm and cool with air; we match the right type to your home.
Air-to-water heat pumps
An air-to-water heat pump is the most common choice for UK homes. It takes warmth from the outside air and uses it to heat water for your radiators, underfloor heating and hot water cylinder. It works with a wet central heating system, much like a boiler, so it fits neatly into how most homes are already set up.
Air-to-air heat pumps
An air-to-air heat pump warms your home by blowing warm air through indoor units, rather than heating water. It can also cool your home in summer. It does not provide hot water on its own, so it suits some homes better than others. Our team will explain whether it is right for you.
Choosing the right type
- Air-to-water suits most homes with radiators
- Air-to-air can also cool your home in summer
- We match the type to your home and needs
Which is right for your home?
The best type depends on how your home is heated now, how you use hot water, and what you want to achieve. During your free survey we look at your property and your heating, then recommend the option that will keep you comfortable and keep running costs down.
- Assessed for your home
- Expert recommendation
- Efficient & low-carbon
Frequently asked questions
What is the difference between air-to-water and air-to-air?
An air-to-water heat pump heats water for your radiators and hot water, so it works like a boiler replacement. An air-to-air heat pump warms your home with warm air and can also cool it, but does not heat your hot water. We recommend the right type after assessing your home.
Which type is most common in the UK?
Air-to-water heat pumps are the most common choice for UK homes because they work with the wet radiator and hot water systems most properties already have.
Can a heat pump cool my home too?
An air-to-air heat pump can provide cooling in summer as well as heating in winter. Air-to-water systems are focused on heating and hot water. We will explain which suits your needs during your free assessment.
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Last reviewed: July 2026 · Reviewed by: Warmr Heating Team