Air source heat pumps are designed to provide heating by transferring heat from the outside air into a property. They use electricity to operate, but unlike a traditional boiler, they do not generate heat by burning fuel.
One of the key points to understand when considering a heat pump is efficiency. But what does heat pump efficiency actually mean, and what can affect how efficiently a system operates?
How Does an Air Source Heat Pump Work?
An air source heat pump extracts available heat from outdoor air and transfers it into the heating system inside the property.
Electricity is used to operate components such as the compressor, fans and pumps. The system then delivers heat to the home through the selected heating system and, where supported, can also provide domestic hot water.
Because the heat pump transfers heat rather than producing all of it directly from electricity, its operation is different from conventional electric heating.
What Does Heat Pump Efficiency Mean?
Heat pump efficiency is often discussed using Coefficient of Performance (COP).
COP compares the heat output of a heat pump with the electricity it uses under particular operating conditions.
For example, a COP of 4 means that under the specified conditions, the system produces four units of heat for every unit of electricity used.
However, this does not mean a heat pump will always operate at a COP of 4. Actual performance changes according to factors such as outdoor temperature, heating water temperature and system design.
What Affects Air Source Heat Pump Efficiency?
Outdoor Temperature
Air source heat pumps use heat from outdoor air. When temperatures fall, the available heat and the property's heating demand can change.
The system may therefore operate differently during colder weather compared with milder conditions.
Flow Temperature
The temperature required by the heating system can have an important effect on heat pump performance.
A system designed around suitable lower flow temperatures can operate differently from one that requires higher water temperatures. The required temperature depends on the property, heating system and heat emitters.
Home Insulation
Insulation helps reduce heat loss from a property.
A home that loses less heat may require less energy to maintain a comfortable indoor temperature. This is why insulation and heating system design are important considerations when planning an air source heat pump.
Heat Pump Size
The heat pump should be suitable for the heating requirements of the property.
Choosing a system based on the building's actual heat demand helps create a heating system that is appropriately matched to the home.
System Design
Efficiency is not only about the outdoor unit. The complete heating system matters, including controls, pipework, hot water requirements and heat emitters.
A properly designed system should work together as a complete heating solution.
Seasonal Efficiency Matters
A heat pump does not operate under one fixed set of conditions throughout the year. Outdoor temperatures, heating demand and operating temperatures change from season to season.
For this reason, looking only at a single laboratory performance figure does not provide the complete picture of how a system may perform in a real home.
Homeowners should consider the expected operating conditions and the complete system when comparing heat pump options.
Can Heat Pumps Be Used for Hot Water?
Many air source heat pump systems can also provide domestic hot water through a compatible cylinder.
Hot water production forms part of the overall energy demand of a property. The system configuration, cylinder and hot water requirements can therefore influence how the heat pump operates.
Infinity Solar UK supplies Daikin air source heat pumps, hot water cylinders and complete heat pump kits for UK customers.
How Can You Support Efficient Heat Pump Operation?
There are several practical points to consider:
- Make sure the heat pump is correctly sized.
- Consider the property's heat loss and insulation.
- Use suitable heating controls.
- Keep the heating system properly maintained.
- Follow the manufacturer's operating guidance.
- Consider the required flow temperature.
- Select compatible system components.
- Make sure the heating system is designed around the property's requirements.
Efficiency should be considered as part of the complete heating system rather than focusing on the heat pump alone.
Daikin Air Source Heat Pumps from Infinity Solar UK
Infinity Solar UK supplies a range of Daikin Altherma air source heat pumps, including different systems designed for different heating applications.
The range includes low-temperature, mid-temperature and high-temperature options, along with hot water cylinders, accessories and complete heat pump kits.
The appropriate system depends on factors such as the property, heating requirements, hot water demand and existing heating setup.
Frequently Asked Questions
Are air source heat pumps efficient?
Air source heat pumps can provide multiple units of heat for each unit of electricity used under suitable operating conditions. Actual performance depends on the system and how it operates.
What is COP in a heat pump?
COP stands for Coefficient of Performance. It compares heat output with electrical energy input under specified conditions.
Does cold weather affect heat pump efficiency?
Outdoor temperature can affect heat pump operation and efficiency. Heating demand can also increase during colder periods.
Does insulation affect heat pump performance?
Yes. A property's heat loss influences its heating demand, so insulation can be an important part of planning an efficient heating system.
Are all air source heat pumps equally efficient?
No. Different models have different specifications and operating characteristics. System design and operating conditions also influence actual performance.