Homeowners Professionals

Air source heat pump installation guide

Viessmann's air source heat pump installation guide is essential reading for anyone upgrading their existing heating system. Still stuck? Contact us for advice.

Why install an air source heat pump?

Air source heat pumps can make an eco-friendly alternative to conventional heating solutions. Working in a similar way to a refrigerator but in reverse, they allow you to generate heat energy from the surrounding air.

These heat pumps absorb warmth from the air and transfer it to a heat exchanger. This causes a refrigerant to evaporate, and the refrigerant steam is then compressed and transferred to the hot water and heating circuits in your home. Because they are so efficient, these systems can generate heat even when the outside temperature drops as low as -15°C. Unlike gas and oil boilers, air source heat pumps are designed to deliver heat at lower temperatures over long periods of time.

There are many benefits associated with air source heat pumps. And with the Boiler Upgrade Scheme voucher you can receive £5,000 off the quoted price for a heat pump. This is an installer-led scheme where the fitter claims the money back once they have installed your heat pump. To find out more about this visit “What is the Boiler Upgrade Scheme”.

The systems also help you to reduce your carbon footprint, and they can eliminate the need for fuel deliveries and storage. Air source heat pumps have a long lifespan too, and they require minimal maintenance. They are also easy to install and, when located outside your property, they can save space.


Are air source heat pumps noisy?

As a result of years of intensive research and development work, Viessmann air source heat pumps operate very quietly and are hardly audible while in use. They benefit from Advanced Acoustic Design, meaning that all the components of the pumps are designed to keep noise to a minimum. In particular, low-frequency sounds that are often perceived as especially disturbing have been minimised.

What size air source heat pump do I need?

If you decide to go ahead with air source heat pump installation, it’s essential that you choose the right size system to meet your heating and hot water needs. Pump sizes range from 6kW to 15kW. Unsurprisingly, larger homes tend to require more powerful heat pumps. The level of insulation and draught proofing in your home will also be a factor. The better your property is at retaining heat, the less warmth you’ll need to generate.

Your heat distribution system will have an impact too. Air source heat pumps typically perform best when connected to low temperature heat emitters, such as underfloor heating systems. If this isn’t an option for you and you will be relying on radiators instead, they will need to be larger radiators than you would use with a gas or oil boiler.

Opting for a pump that’s too big will mean you end up paying more than you need to. On the other hand, if your system is too small, it won’t provide sufficient heat for your home.

An air source heat pump installer will be able to advise you on the right size system for your property.


Do I need planning permission to install an air source heat pump?

Most air source heat pump installations don’t require planning permission, but it’s a good idea to check before you start the process. It’s important to be aware that planning permission is required for listed buildings and homes located in conservation areas and World Heritage Sites


How much does air source heat pump installation cost?

The cost of air source heat pump installation will depend on a number of factors, including the model you go for and its size. The complexity of the installation will also have an impact. For example, if you want to install a new underfloor heating system or change your radiators, the cost of installation will rise.

As a very rough guide, installing a typical system tends to cost between £7,000 and £9,000. Bear in mind that combining the installation with other building work can lower the cost.

When considering the numbers, it’s important to factor in the savings you could make as a result of an air source heat pump thanks to lower energy bills and the potential to earn money through the Renewable Heat Incentive. To optimise your savings, ensure your property is well insulated and you have a suitable heat distribution system.

Also, make sure you have a clear understanding of the controls. This will help ensure you operate the system as efficiently as possible.


Who should I get to install an air source heat pump?

Unlike with certain other heating systems, there is no legal requirement for installers to have particular certification in order to fit one of these systems. However, in order to be eligible for the government grant scheme like the  Boiler Upgrade Scheme, you will need to use an installer who is certified under the Microgeneration Certification Scheme. You should also look for installers who are members of one of the following consumer codes: the Home Insulation & Energy Systems Contractors Scheme or the Renewable Energy Consumer Code.

Always make sure installers provide detailed quotes in writing, and it’s advisable to get a few different quotes before you commit to using one company. You may also benefit from checking customer reviews of previous installations for added peace of mind.


How will the installation process work?

Air source heat pumps are usually easier to install than other types of heat pump. For example, unlike ground source heat pumps, they don’t require any digging in the garden. The process can often be completed within two days, but this will vary depending on the size of the system and how complicated the installation is. Your installer will be able to provide you with a detailed schedule before they begin work.

A good installer will turn up with all the equipment necessary to complete the job efficiently and they will clean up after themselves once the work is complete.

After they have finished the job and tested the new system, your installer will explain to you how it works. It’s important to pay attention to this information. This will help you to get the most from your new heat pump.

We hope this air source heat pump installation guide has been useful. If you would like further information or advice, please contact our friendly and helpful team.

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