Video courtesy of Home Energy Scotland
What can Air Source Heat Pumps do?
Air source heat pumps absorb heat from the outside air. This heat can then be used to heat radiators, underfloor heating systems, or warm air convectors and hot water in your home.
An air source heat pump extracts heat from the outside air in the same way that a fridge extracts heat from its inside. It can get heat from the air even when the temperature is as low as -15° C. Heat pumps have some impact on the environment as they need electricity to run, but the heat they extract from the ground, air, or water is constantly being renewed naturally.
The benefits of air source heat pumps
- Lower fuel bills, especially if you are replacing conventional electric heating
- potential income through the UK government’s Renewable Heat Incentive (RHI)
- lower home carbon emissions, depending on which fuel you are replacing
- no fuel deliveries needed
- can heat your home as well as your water
- minimal maintenance required
- can be easier to install than a ground source heat pump.
Unlike gas and oil boilers, heat pumps deliver heat at lower temperatures over much longer periods. During the winter they may need to be on constantly to heat your home efficiently. You will also notice that radiators won’t feel as hot to the touch as they might do when you are using a gas or oil boiler.
How do air source heat pumps work?
Heat from the air is absorbed at low temperature into a fluid. This fluid then passes through a compressor where its temperature is increased, and transfers its higher temperature heat to the heating and hot water circuits of the house. There are two main types of air source heat pump systems.
An air-to-water system distributes heat via your wet central heating system. Heat pumps work much more efficiently at a lower temperature than a standard boiler system would. This makes them more suitable for underfloor heating systems or larger radiators, which give out heat at lower temperatures over longer periods of time.
An air-to-air system produces warm air which is circulated by fans to heat your home. They are unlikely to provide you with hot water as well.
Is an air source heat pump suitable for me?
To tell if an air source heat pump is right for you, there are a few key questions to consider:
- Do you have somewhere to put it? You’ll need a place outside your home where a unit can be fitted to a wall or placed on the ground. It will need plenty of space around it to get a good flow of air. A sunny wall is ideal.
- Is your home well insulated? Since air source heat pumps work best when producing heat at a lower temperature than traditional boilers, it’s essential that your home is insulated and draught-proofed well for the heating system to be effective.
- What fuel will you be replacing? The system will pay for itself much more quickly if it’s replacing an electricity or coal heating system. Heat pumps may not be the best option for homes using mains gas.
- What type of heating system will you use? Air source heat pumps can perform better with underfloor heating systems or warm air heating than with radiator-based systems because of the lower water temperatures required.
- Is the system intended for a new development? Combining the installation with other building work can reduce the cost of installing the system.
You may also want to consider ground source heat pumps, which use pipes buried in the garden to extract heat from the ground.
How much you can save will depend on what system you use now, as well as what you are replacing it with. Your savings will be affected by:
- Your heat distribution system. If you have the opportunity, underfloor heating can be more efficient than radiators because the water doesn’t need to be so hot. If underfloor heating isn’t possible, use the largest radiators you can. Your installer should be able to advise on this.
- Your fuel costs. You will still have to pay fuel bills with a heat pump because it is powered by electricity, but you will save on the fuel you are replacing.
- Your old heating system. If your old heating system was inefficient, you are more likely to see lower running costs with a new heat pump.
- Water heating. If the heat pump is providing hot water then this could limit the overall efficiency. You might want to consider solar water heating to provide hot water in the summer and help keep your heat pump efficiency up.
- Using controls. Learn how to control the system so you can get the most out of it. You will probably need to set the heating to come on for longer hours, but you might be able to set the thermostat lower and still feel comfortable. Your installer should explain to you how to control the system so you can use it most effectively.
These are the savings you might make every year when replacing an existing heating system in an average four-bedroom detached home with an average air source heat pump installation.
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With low installation costs (compared to other systems e.g. ground source), and high efficiency, in the long term the financial benefits are clear. Plus, it’s a modern and green solution.
Find out more
You can find out more about ground source heat pumps on the Energy Savings Trust website by clicking on the following link – www.energysavingtrust.org.uk
You will be advised on the expected installation time in your free estimate and can take 5 days or more.
To make sure you get the best air source heating system for your circumstances we will provide design options using equipment from the following manufacturer.
*Only by using MCS Accredited Installers & equipment will you qualify for RHI & FiT.
For further information on how we can install this on your property give us call us on the number below.