Combining Air Source Heat Pumps And Solar Panels: UK Guide

How Air Source Heat Pumps and Solar Panels Work Together

Air source heat pumps and solar panels are becoming more common in UK homes.

Many homeowners now want to know whether combining the two systems is worth it.

Understanding the basics helps explain how they can support each other.

How an air source heat pump heats your home

A heat pump takes heat from the outside air and upgrades it for use in your home.

It uses electricity to do this, but it gives out more heat than the electricity it uses.

It works steadily rather than giving quick blasts of high heat, which is why insulation and correct radiator sizing make a big difference.

How solar panels generate electricity

Solar panels turn daylight into electricity. They produce the most in the middle of the day but still work on cloudy days, just at a lower level.

Why they complement each other

A heat pump uses electricity to run. Solar panels produce electricity.

When both systems are installed:

• Solar panels help power the heat pump during the day.
  

• The home uses less electricity from the grid.
  

• Running costs can fall because more heating energy comes from your own generation.
  

This is why many homes find the combination beneficial.

Benefits of Combining Heat Pumps and Solar Panels

The benefits vary between homes, but several clear advantages apply to most households.

Lower running costs for heating and hot water

Because a heat pump runs on electricity, using solar energy during the day can reduce how much paid electricity you need.

Real examples:

• A family home where someone is at home during the day may notice strong savings.
  

• A two bedroom home with good insulation may see a clear reduction in daytime electricity use.
  

• A household with regular hot water use throughout the day often benefits because the heat pump can run more often while solar is generating.
  

Better efficiency across the year

Heat pumps work steadily. Solar panels work through daylight hours. These patterns often line up well. Even in winter, any solar generation reduces the load on grid electricity.

Reduced reliance on the grid

Using more of your own electricity gives you more control over your energy use, especially during the day.

Predictable long term performance

Both systems work well for many years when installed correctly. They help create a steady, reliable home heating setup.

When a Combined System Works Best

Not all homes benefit in the same way. A combined system works especially well when certain conditions are met.

Homes with good insulation

A heat pump performs best when the home holds onto heat.

Cavity wall insulation, loft insulation and good windows make a noticeable difference.

When heat loss is reduced, the heat pump uses less electricity and solar power goes further.

Homes with daytime electricity use

The more electricity used during the day, the more solar can help. For example:

• Home working households
  

• Families using heating and appliances throughout the day
  

• Homes with consistent hot water use
  

• Homes with electric vehicles charging in daylight hours
  

Homes with enough roof space for panels

A south or southwest facing roof gives the strongest output, but east and west facing roofs can also perform well.

When battery storage may be helpful

Some homes add a battery to store extra solar electricity for later use.

This is not essential for a heat pump but can help if the household uses most electricity in the evenings.

Common Questions About Heat Pumps and Solar Panels

Will solar panels fully power a heat pump

Not all year. Solar can support the heat pump during the day, but most homes still use electricity from the grid.

Solar reduces grid reliance but does not replace it.

How much electricity does a heat pump use

The amount depends on home size, insulation and how warm you prefer the property.

Homes that hold heat well need less electricity to stay warm.

Can a heat pump run at night or on cloudy days

Yes. A heat pump runs whenever needed, using grid electricity if solar output is low.

Do radiators or cylinders need changing

Some homes may need larger radiators to help the heat pump work efficiently.

Hot water cylinders may also need updating if they are not suited to heat pump temperatures.

What Affects Performance When Using Both Systems

Performance varies between homes. Key factors include:

• Home insulation levels
  

• Radiator sizes
  

• Cylinder capacity
  

• Roof space for solar panels
  

• Direction and angle of the roof
  

• Daytime electricity use
  

• Local climate and shade
  

• Heat loss across large rooms
  

These factors help determine how well the two systems work together.

Costs: Average UK Guide Prices

Costs vary depending on home size, system size and any upgrades needed. These figures are broad UK averages.

Cost of an air source heat pump

Most homes fall between £7,000 and £13,000, depending on specification.

Cost of solar panels

A typical home installation ranges from £5,000 to £8,000.

Cost of combining both systems

A combined installation usually sits between £12,000 and £20,000 depending on radiator upgrades, cylinder changes and system size.

Why costs vary

• Larger homes need larger heat pumps
  

• More panels increase system output
  

• Some homes need new radiators for correct heat pump operation
  

• Installation can be simpler or more complex depending on layout
  

This helps explain why two homes of similar size can still have different project costs.

Simple Comparison Table

Safety and Responsible Guidance

To keep your home and heating system safe:

• All electrical work must be completed by qualified installers.
  

• Do not attempt to open or adjust sealed parts of the heat pump.
  

• Do not try to connect solar equipment to heating systems yourself.
  

• Always follow the installer’s advice on maintenance and servicing.
  

This protects both your home and the system.

Is It Worth Combining Heat Pumps and Solar Panels

Many homes find the combination worthwhile.

When installed in the right conditions, a combined system can reduce electricity use, lower heating costs and create a more efficient and stable home setup.

Homes with good insulation, regular daytime use and suitable roof space often see the greatest benefit.

Homes with high heat loss or limited roof space may not see the same return, but a heat pump alone can still work well when sized correctly.

Heat pump and solar combination summary

If you are thinking about a heat pump or want help understanding what suits your home, iHeat installs air source heat pumps from leading brands including Worcester Bosch, Vaillant and Alpha.

You can get a free online quote and simple guidance to help you choose the right system for your home.