How much does a heat pump cost to run?

Heat pumps are highly efficient heating systems, but many homeowners in the UK are concerned about their ongoing running costs. While the initial investment can be significant, understanding how these systems work and how to optimise their operation can lead to substantial long-term savings. The actual cost to run a heat pump varies considerably based on several factors, but smart energy management plays a crucial role in keeping bills down.

Understanding heat pump running costs

How a heat pump works

A heat pump is a heating and cooling device that moves heat from one place to another, rather than generating it by burning fuel. In winter, it extracts heat from the outside air (or ground or water) and transfers it into your home. In summer, some models can reverse the process to provide cooling. They use electricity to power this heat transfer, making them a low-carbon alternative to traditional boilers.

Measuring heat pump efficiency (COP and SCOP)

Heat pump efficiency is measured by its Coefficient of Performance (COP) or, more accurately, its Seasonal Coefficient of Performance (SCOP). This figure indicates how many units of heat the pump produces for every unit of electricity it consumes. Air source heat pumps can achieve efficiencies of 300% or more, meaning they produce at least 3 kWh of heat for every 1 kWh of electricity used. This high efficiency is possible because heat pumps transfer existing heat rather than generating it from scratch.

Key factors influencing running costs

Several factors combine to determine how much a heat pump costs to run in a typical UK home. Understanding these can help you manage your energy expenditure.

Property insulation and size

The better insulated your home, the less heat will escape, and the less your heat pump will need to work to maintain a comfortable temperature. A well-insulated, smaller property will naturally have lower running costs than a large, poorly insulated one, as the heat pump's workload is directly proportional to the heat loss.

External temperature and climate

Heat pumps extract heat from the outside air, even in cold conditions. However, their efficiency can decrease as external temperatures drop significantly. In colder climates or during prolonged cold snaps, a heat pump may need to work harder, potentially using more electricity to achieve the desired indoor temperature.

System type and efficiency

The specific type of heat pump (air source, ground source, or water source) and its individual efficiency rating (COP/SCOP) play a major role. Newer, more advanced models often boast higher efficiencies, translating to lower electricity consumption for the same heat output.

Electricity prices and tariffs

As heat pumps run on electricity, the price you pay per kilowatt-hour (kWh) directly impacts your running costs. Standard variable tariffs can fluctuate, while fixed tariffs offer price certainty. Smart tariffs, particularly time-of-use tariffs, can offer cheaper rates during off-peak hours, allowing you to run your heat pump more cost-effectively.

User behaviour and settings

How you use your heat pump also affects its running costs. Constantly adjusting the thermostat, setting very high temperatures, or leaving windows open can increase energy consumption. Consistent, moderate temperature settings and effective use of controls can help maintain efficiency.

Heat pump vs gas Boiler: a running cost comparison

Comparing heat pump running costs with traditional gas boilers involves looking beyond just fuel prices, considering the fundamental differences in how they operate and their respective efficiencies.

Efficiency differences

Modern condensing gas boilers typically operate at efficiencies of around 90-95%, meaning for every unit of gas energy consumed, they convert 0.9 to 0.95 units into heat. Heat pumps, however, achieve efficiencies of 300% or more, producing at least 3 kWh of heat for every 1 kWh of electricity used. This means heat pumps deliver significantly more heat energy per unit of input energy.

Fuel costs and carbon emissions

While electricity prices per kWh are generally higher than gas prices, the heat pump's superior efficiency can offset this difference. Furthermore, heat pumps produce no direct carbon emissions at the point of use, contributing to a lower carbon footprint compared to gas boilers.

Long-term financial outlook

The long-term financial outlook for heat pumps is positive. As the UK grid decarbonises and more renewable energy sources come online, the carbon intensity of electricity decreases. Coupled with potential future shifts in energy pricing structures that favour electricity over fossil fuels, heat pumps are positioned to become an increasingly cost-effective and environmentally friendly heating solution.

Optimising your heat pump's efficiency and costs

Taking an active approach to managing your heat pump can significantly reduce its running costs.

Maximising insulation and draught-proofing

The most effective way to reduce your heat pump's workload is to minimise heat loss from your home. This means ensuring your property is well-insulated, including lofts, walls, and floors, and that all draughts are sealed. Investing in insulation improvements can lead to substantial savings on your heating bills.

Leveraging smart controls and scheduling

Modern heat pumps come with advanced controls that allow for precise scheduling and temperature management. Utilise these features to set your heating to come on only when needed and to maintain a consistent, comfortable temperature rather than constantly adjusting it. Smart thermostats and energy management apps can provide even greater control, especially when paired with a smart meter installation.

Regular maintenance and servicing

Just like any other heating system, regular professional maintenance is crucial for a heat pump to operate at peak efficiency. Annual servicing can identify and address any potential issues early, ensuring your system continues to perform optimally and preventing costly breakdowns.

The power of smart tariffs for heat pump owners

Smart tariffs are a game-changer for heat pump owners, offering a direct path to lower running costs and greater control over energy expenditure.

Time-of-use tariffs explained

Time-of-use (ToU) tariffs offer different electricity prices depending on the time of day. Typically, electricity is cheaper during off-peak hours (e.g., overnight) when demand on the grid is lower, and more expensive during peak times.

How smart tariffs reduce costs

By shifting a significant portion of your heat pump's operation to these cheaper off-peak periods, you can drastically reduce your running costs. For example, you could pre-heat your home during the night when electricity is cheaper, allowing the heat pump to run less during more expensive daytime hours.

Gaining control with energy management apps

Energy management apps, such as the Fuse app, provide insights into your home's overall energy consumption. This helps you manage costs effectively by scheduling operation during the most cost-effective periods, monitoring usage, and making informed adjustments to optimise your energy expenditure.

Financial support for heat pump installation

While this article focuses on running costs, it's worth noting the significant support available for the initial installation of a heat pump.

The Boiler Upgrade Scheme (BUS)

The Boiler Upgrade Scheme (BUS) offers grants to help homeowners in England and Wales install low-carbon heating systems like heat pumps1. The scheme provides grants of £7,500 for air source and ground source heat pumps. For households currently using heating oil, an uplifted grant of £9,000 is available to help them transition to a heat pump. The application process is managed by an MCS-certified installer on your behalf, with the grant value deducted directly from your installation quote.

Other potential grants and incentives

Beyond the BUS, other local or regional grants and incentives may be available to support the installation of heat pumps. It's always worth checking with your local authority or energy advice services for any additional schemes that could further reduce upfront costs.

Making the switch to a heat pump

Switching to a heat pump represents a significant step towards a more sustainable and potentially more cost-effective home heating solution. By understanding the factors that influence running costs and actively managing your system with smart tools and tariffs, you can gain control over your energy usage and maximise the financial and environmental benefits of your heat pump.

Ready to take control of your home's energy? Fuse Energy offers clear pricing, real-time usage data through our app, and 24/7 human customer support to help you manage your energy effectively. Our smart tariffs are designed to help heat pump owners reduce their running costs. Switching is quick and easy.