How much does a heat pump cost to run?

Understanding the running costs of a heat pump is crucial for homeowners considering an upgrade to their heating system. Heat pumps are highly efficient, converting one unit of electricity into multiple units of heat, making them a compelling alternative to traditional boilers. However, the primary running cost comes from electricity consumption, which is influenced by the unit price of electricity, as well as factors like property insulation, size, and external temperatures.

Fuse Energy empowers homeowners to take active control over their heat pump running costs by providing smart tariffs and an intuitive app for optimisation.

Understanding heat pump running costs

Heat pumps offer an efficient way to heat your home, but their operational expenses are a key consideration. Unlike gas boilers that burn fuel, heat pumps move existing heat, primarily using electricity. This fundamental difference means their running costs are tied directly to electricity prices and how efficiently they can transfer heat.

What is a heat pump and how does it work?

A heat pump is an electrical device that extracts heat from one place and transfers it to another. Air source heat pumps, the most common type in the UK, absorb heat from the outside air, even on cold days, and use it to warm your home and hot water. This process does not create heat by burning fuel; instead, it moves it, making it significantly more efficient than conventional heating systems.

Why running costs are a key consideration for homeowners

For many homeowners, the upfront cost of installing a heat pump is a significant hurdle, but the long-term running costs are equally important. These ongoing expenses determine the true affordability and potential savings over the system's lifespan. Understanding these costs allows homeowners to make informed decisions and budget effectively, moving away from the anxiety of unpredictable energy bills.

Factors influencing heat pump efficiency and running costs

Several factors dictate how much electricity your heat pump will use and, consequently, how much it costs to run.

Coefficient of performance (COP) explained

The efficiency of a heat pump is measured by its Coefficient of Performance (COP). This figure indicates how many units of heat the pump produces for every unit of electricity it consumes. For instance, a heat pump with a COP of 3 delivers three units of heat for every one unit of electricity used. Air source heat pumps typically achieve efficiencies of 300% or more, meaning a COP of at least 3. A higher COP means greater efficiency and lower running costs.

Impact of property insulation and size

The better your home's insulation, the less heat will escape, and the less your heat pump will need to work to maintain a comfortable temperature. Properties with poor insulation will see higher running costs as the heat pump continuously tries to compensate for heat loss. Similarly, larger properties naturally require more energy to heat, so the size of your home directly influences consumption.

External temperature and climate considerations

Heat pumps extract heat from the ambient air, so their efficiency can be affected by external temperatures. While modern heat pumps are designed to operate effectively even in cold UK winters, their COP may decrease slightly in very low temperatures. The overall climate of your region will therefore play a role in seasonal running costs.

System design, installation, and maintenance

Proper system design and professional installation are paramount for optimal efficiency. An undersized or oversized heat pump, or one that is poorly installed, will operate less efficiently and cost more to run. Regular maintenance, including checking refrigerant levels and cleaning components, also ensures the system runs at its best.

Estimating your heat pump's energy use

Calculating your heat pump's energy use helps you budget and understand its impact on your electricity bill.

Calculating daily and monthly electricity consumption

To estimate your heat pump's electricity consumption, you need its heat output, its COP, and the number of hours it operates. For example, if your home requires a certain amount of heat annually and your heat pump has a COP of 3, it would consume approximately one-third of that amount in electricity per year. You can then divide this by 12 for a monthly estimate or 365 for a daily figure.

Average annual running costs for air source heat pumps

The average UK home uses around 2,500 kWh of electricity per year1. A heat pump will add to this. If we consider the example above, with an annual electricity consumption for heating, plus the average household electricity use, the total could be a combined figure.

The role of electricity unit rates (pence/kWh)

The unit price of electricity directly impacts your running costs. For the period of 1 October to 31 December 2026, the electricity unit rate for Direct Debit customers under the Ofgem Price Cap is 26.32p per kWh. Furthermore, VAT on domestic electricity in Great Britain is temporarily reduced to 0% from 1 October 2026 to 31 March 2027. This means that for every kWh your heat pump uses, you pay the prevailing unit rate.

Heat pump vs gas boiler: a running cost comparison

Comparing heat pumps to gas boilers involves more than just looking at unit fuel prices; efficiency plays a critical role.

Comparing efficiency and fuel prices

Gas boilers typically operate at efficiencies of 80-90%, meaning they convert 80-90% of the gas they burn into heat. In contrast, heat pumps, with their COP of 3 or more, deliver significantly more heat energy per unit of electricity consumed. While electricity unit rates are generally higher than gas unit rates, the superior efficiency of heat pumps can often lead to comparable or lower overall running costs, especially when replacing an older, less efficient boiler. The average UK home uses around 9,500 kWh of gas per year.

Long-term savings and environmental benefits

Over the long term, heat pumps can offer substantial savings, particularly as electricity grids decarbonise and the price of fossil fuels remains volatile. Beyond financial savings, heat pumps significantly reduce carbon emissions, contributing to a greener home and supporting the UK's net-zero targets. You can learn more about how to choose an energy supplier that aligns with your values here.

Considerations for different property types

The suitability and cost-effectiveness of a heat pump can vary by property type. Well-insulated, modern homes are often ideal candidates. Older properties may require insulation upgrades before a heat pump can operate at its peak efficiency, which can add to the initial investment but yield greater long-term savings. Understanding your energy bill can help you identify areas for improvement here.

Optimising your heat pump's running costs

Taking proactive steps can significantly reduce your heat pump's operational expenses.

Improving home insulation and draught-proofing

This is arguably the most impactful step. Improving loft, wall, and floor insulation, along with effective draught-proofing, minimises heat loss. This allows your heat pump to work less, consuming less electricity and lowering your bills.

Using smart controls and thermostats effectively

Smart thermostats and controls allow you to program your heating more precisely, ensuring your heat pump only runs when needed. Features like zone control, where different areas of your home are heated to different temperatures, can further enhance efficiency.

Regular maintenance and servicing

Just like any heating system, regular servicing keeps your heat pump running smoothly and efficiently. An annual check-up by a qualified engineer can identify and address minor issues before they escalate, maintaining optimal performance and preventing costly breakdowns.

Leveraging smart electricity tariffs

Smart tariffs are designed to offer cheaper electricity during off-peak hours. By programming your heat pump to run more during these periods, you can significantly reduce its running costs. This is particularly effective for heating hot water or pre-heating your home when electricity is cheaper.

How Fuse Energy supports heat pump homes

Fuse Energy is committed to empowering homeowners with the tools and tariffs needed to make the most of their heat pump investment.

Smart tariffs for cheaper off-peak electricity

Fuse's smart tariffs are specifically designed to align with the operational patterns of heat pumps. By offering cheaper electricity during off-peak hours, Fuse enables heat pump owners to run their systems more economically, reducing overall running costs. This approach transforms energy from a source of anxiety into a tool for comfort and savings.

Monitoring and managing usage with the Fuse app

The Fuse app provides homeowners with detailed insights into their heat pump's electricity consumption. This transparency allows you to monitor usage in real-time, understand energy patterns, and identify opportunities for optimisation. With this level of detail, you can actively manage your energy use, ensuring your heat pump operates as efficiently as possible.

Empowering control over your energy consumption

Fuse empowers homeowners to actively optimise their heat pump usage, challenging the notion of rationing heat due to high costs. Through smart tariffs and the intuitive app, you gain control over your energy consumption, allowing you to enjoy a warm, comfortable home without constantly worrying about the bill. This focus on control and abundance means you have the power to play with your energy, making informed choices that benefit both your wallet and the environment.