2. How Effective are Air Source Heat Pumps?
There’s no straightforward answer here, as there are several factors that can impact a heat pump's performance. System capacity, manufacturer, and seasonal efficiency rating all play a part, as do the design and fabric of the building in which they’re installed.
We also need to account for the way these systems work. They run at a lower heat supply, so you’ll need large heat emitting surfaces like underfloor heating for maximum effectiveness. When considering installation of an air source heat pump, it’s best to seek professional guidance to ensure you get the most effective results possible.
3. Do Air Source Heat Pumps Work With Radiators?
Air to water heat pumps (which work in conjunction with wet central heating systems) do work with radiators - but as we’ve just discussed, they require large heat emitting surfaces. This means your existing radiators might not be up to the job. They also require higher flow than traditional systems, so it’s likely that your pipework would need replacing for a larger diameter too.
You’ll need to reference the flow temperature of the heat pump and size your radiators and pipework accordingly.
4. How Many Years Should a Heat Pump Last?
Thanks to technological advancements, modern heat pumps can last for anything between 20 and 25 years - so although their initial cost may be higher than a standard boiler, their longevity (and efficiency) often makes up for this in the long run.
However, this expected lifespan will only be achieved with appropriate maintenance. An annual service by a qualified technician will be required to ensure your system lasts as long as it should.
5. Can You Install a Heat Pump in an Existing Home?
ASHPs can indeed be retrofitted, and in many cases with little disruption. However, you will need to consider how suitable they are for your property, and any additional work that may be required.
They’re best suited to well insulated homes so you may need to make some upgrades here, as well as potentially installing new radiators or underfloor heating. In older properties with particularly poor insulation, an ASHP simply won’t be able to meet your heating needs.
6. Do Air Source Heat Pumps Work in Cold Weather?
ASHPs draw in heat from the outside air and pull it through a heat exchanger, where it’s absorbed by a refrigerant. The refrigerant then evaporates into a gas, which is compressed - increasing its temperature above that of the heat initially absorbed.
This is how they continue to work in colder weather - anything down to around -15℃. However, below zero and their efficiency does begin to fall.