Air-source versus ground-source heat pump
We look at the main differences between ground-source and air-to-water heat pumps to help you decide which is best for you
So you’ve decided to invest in a heat pump. After looking at all the options, you’ve narrowed it down to two choices: air-to-water or ground-source. In this article, we look at the pros and cons of each option to help you reach that final decision.
The main difference between ground-source and air-to-water heat pumps is simply where they get their energy from.
An air-to-water heat pump absorbs heat from the air, while a ground-source heat pump draws energy from the ground.
Efficiency and sustainability
If you’ve decided to switch to a heat pump, you’ll be aware of the cost, efficiency and sustainability benefits of this form of renewable energy.
This is true of both air-to-water and ground-source heat pumps. Both offer a sustainable alternative to fossil fuel heating systems. Both operate around 70-80 % on renewable energy, while the remaining power input comes from electricity.
While they work similarly in that respect, ground-source heat pumps are more often used in places with longer, more severe winters, while air-to-water heat pumps are popular in all climate zones and geographies across Europe.
Air-to-water and ground-source heat pump installation
Another difference between the two types of heat pump is their installation. An air-to-water heat pump comprises an indoor and an outdoor unit. A ground-source heat pump has an indoor unit and an outdoor heat exchanger, installed in the ground.
The latter requires plenty of outdoor space with the right ground conditions. They’re generally better suited to new build homes or when you’re upgrading an existing ground-source heat pump.
Air-to-water heat pumps are more straightforward to install and come in low-, mid- and high-temperature varieties, making them ideal for any type of home, from a new build to an older property.
They’re also a great replacement solution in homes that use fossil fuel systems.
What they have in common, where installation is concerned, is the emitters they connect to. Installing new or replacement emitters, such as radiators or underfloor heating, involves a similar process for both air-to-water and ground-source heat pumps.
Installation costs
The cost of a heat pump varies by type. Because of the additional logistics, a ground-source heat pump is more expensive to install than an air-to-water heat pump. There’s also the cost of any new or replacement emitters that need to be bought and installed.
As well as reducing your energy bills, a heat pump is easier to service and maintain than traditional heating solutions. Having a renewable energy system also increases the value of your home.
In conclusion
Both air-to-water and ground-source heat pumps offer you lots of benefits in terms of environmental impact, efficiency and long-term savings.
Which choice is right for you will depend on several factors: like the type of property you live in, your budget and your needs.
Talking through the options with a qualified installer will help you reach a decision on the best solution for you.
