With energy prices rising and the push for eco-friendly heating solutions increasing, more homeowners are considering air-source heat pumps as an alternative to traditional gas boilers. But before making the switch, a common concern is: How much space does an air source heat pump need? Whether you live in a house with a garden or a compact urban home, understanding the space requirements will help determine if this heating system is right for you. Prisma Boiler Grants specializes in assisting homeowners in accessing government-backed funding for heat pumps, making it easier to transition to a greener and more cost-effective heating solution.
Understanding Air Source Heat Pumps
An air source heat pump (ASHP) is a heating system that extracts heat from the outside air and transfers it inside your home. Unlike traditional gas or oil boilers that burn fuel, ASHPs use electricity to move heat, making them energy-efficient and environmentally friendly. They come in two main types:
- Air-to-water heat pumps – provide heating and hot water by transferring heat to your home’s radiators or underfloor heating system.
- Air-to-air heat pumps – Heat your home by blowing warm air inside but do not provide hot water.
How Much Outdoor Space is Required?
The outdoor unit of an air source heat pump is the most critical part regarding space requirements. It is usually installed on the ground or mounted on an external wall. Here’s what you need to consider:
- Size of the outdoor unit: Most standard heat pump units are around 1.5 meters high, 1 meter wide, and 0.5 meters deep, roughly the size of two washing machines placed side by side.
- Space for airflow: To work efficiently, the unit must have at least 1.5 meters of clear space in front to allow proper airflow and prevent overheating.
- Distance from walls and boundaries: The unit should be at least 1 meter away from any walls, fences, or vegetation to avoid obstructions that could reduce efficiency.
- Mounting options: If there is limited ground space, the heat pump can be mounted on an external wall or placed on a flat roof, provided there is easy access for maintenance.
Best Locations for an Outdoor Unit
Finding the right place for your heat pump’s outdoor unit is crucial for optimal performance. Here are some recommended locations:
- Side or back of the house – This is the most common placement, ensuring easy access and minimal disruption.
- Garden – If placed in the garden, ensure it’s at least 1 meter away from trees or plants to prevent restricted airflow.
- Flat roof – Some homes install heat pumps on the roof to save space, but this can make maintenance more challenging.
- Garage or outhouse wall – If space is limited near your home, an external garage wall can be an alternative.
Indoor Space Requirements
Apart from the outdoor unit, air source heat pumps require indoor space for components such as the hot water cylinder. Here’s what you need to consider:
- Hot water cylinder: If your heat pump provides hot water, you will need a hot water cylinder, which typically requires a space of around 1.3 meters in height and 0.5 meters in diameter (for a standard 180-liter tank).
- Internal unit: Some ASHPs have an indoor control unit about the size of a small boiler, typically wall-mounted inside a utility room or airing cupboard.
- Piping and connections: The heat pump system includes insulated pipes between outdoor and indoor units. These pipes must be adequately planned to minimize heat loss and improve efficiency.
Installation Considerations
When planning for an air source heat pump installation, keep the following factors in mind:
- Noise levels – While ASHPs are much quieter than traditional boilers, the outdoor unit does produce a low humming sound. Placing it away from bedrooms or neighbors’ windows is advisable.
- Permissions and regulations – In most cases, air source heat pumps do not require planning permission. However, if you live in a listed building or conservation area, you may need approval from your local council.
- Weather exposure – The unit should be placed in a well-ventilated area but not in a spot where snow or leaves can easily accumulate.
Cost and Grants for Heat Pumps
The cost of installing an air source heat pump varies depending on your home’s size, the installation’s complexity, and the type of system you choose. On average, installation costs range between £8,400 and £12,000. However, government grants are available to help reduce the upfront costs.
Is an Air Source Heat Pump Right for You?
Before making the switch, ask yourself:
- Do I have enough outdoor space (at least 1.5m in front of the unit)?
- Can I accommodate a hot water cylinder indoors?
- Am I eligible for government grants to reduce installation costs?
- Do I want to lower my energy bills and carbon footprint?
If the answer to these questions is yes, then an air-source heat pump is an excellent investment for your home.
Conclusion
An air source heat pump is a highly efficient and eco-friendly alternative to traditional heating systems, but it does require proper planning in terms of space. The outdoor unit needs at least 1.5 meters of clearance in front, while an indoor hot water cylinder is necessary for systems that provide hot water. By choosing the right location and taking advantage of government grants, such as those available through Prisma Boiler Grants, you can make the transition to a more affordable and hassle-free sustainable heating system. If you’re considering installing a heat pump, contact Prisma Boiler Grants today to find out how much funding you can receive and take the first step toward a greener home.