Heat pump power consumption: costs and savings

You might be thinking of switching to a heat pump because of its environmental or financial benefits. Is a heat pump truly energy efficient? Let’s take a closer look at heat pump power consumption and see how you can enjoy improved efficiency and lower costs with a heat pump in your home.

Heat pump power consumption

Heat pumps are a sustainable climate control system. They extract heat from the air, water or ground outside and use it to provide heating, cooling or hot water for your home.

Unless you’re using a heat pump as part of a hybrid system - where you combine a heat pump with a gas boiler - you’re not relying on fossil fuels and won’t be paying for any gas at all.

Heat pumps draw up to 75 % of their energy needs from nature for free, with the remainder powered by electricity to drive the compressor and heat exchanger. But that doesn’t necessarily mean a high electricity bill.

Several factors determine how much electricity a heat pump uses. These include the climate, the size of your home and how well insulated it is, and whether the heat pump is providing hot water or cooling.

Generally, efficient consumption depends on having the right heat pump, installed correctly and used properly.

Heat pump efficiency

Heat pump electricity consumption is based on what’s known as the seasonal coefficient of performance (CoP), which allows for variation in performance across a year. A pump has to work harder in the winter than in the summer.

The CoP is calculated by measuring the energy put in (electricity) and the energy (heat) put out. A heat pump typically produces 4 kWh of heat from 1 kWh of electrical energy, which can be cheaper than your gas bills over a year. And there are ways you can boost efficiency further.

Insulation affects the efficiency of any heating system. Ensure all your walls, loft cavities and windows are properly insulated to lessen a heat pump’s workload, and therefore its consumption.

You can also minimise consumption by:

• making sure the heat pump is properly set up and adjusted for your heating system;
• keeping the temperature relatively constant rather than turning it right down at night;
• restricting the flow temperature of the heating water to a comfortable level;
• regularly maintaining your system.

To really maximise efficiency and cut electricity use, consider combining a heat pump with other systems such as underfloor heating and solar panels.

Heat pump and solar panels

When you combine a heat pump with solar panels, the efficiency of both systems can significantly increase. During winter when the sun shines less, a heat pump can provide heating because it draws heat from the air or ground. In summer, solar panels can power the heat pump without relying on the electrical grid.

A solar panel and heat pump combination can take the CoP to four or more units of heat provided for every unit of energy consumed.

Pairing a heat pump with solar panels supercharges its efficiency, resulting in less electricity being drawn from the grid and reduced costs. It enables homeowners to become more energy independent - generating their own power without relying on utility companies.

Considerations for cold climates

Heat pumps must work harder in cold weather, which can reduce their efficiency (lower SCOP) and increase electricity use. However, modern systems can operate efficiently down to -28°C, making them suitable even for extremely cold regions.

In very cold climates or poorly insulated homes, it may be sensible to combine a heat pump with a supplemental or hybrid system, for instance a resistive backup heater, to ensure reliability and comfort. Whilst not always necessary, this hybrid approach can mitigate performance dips during extreme cold.

How to monitor and improve energy usage

To stay on top of energy use, consider energy monitoring tools or smart meters to track real-time kWh consumption of the heat pump. This enables you to spot inefficiencies or anomalies, for example unusually high use when the house is empty, or inefficient hot water cycles.

By setting benchmarks (for example, a target of 4 heat kWh output per 1 kWh electricity), actual performance can be compared against expected CoP and issues can be flagged to an installer or technician.

Regularly reviewing performance, particularly after seasonal changes, insulation upgrades or usage changes, helps keep the system efficient and savings consistent.

Energy-saving upgrades to complement your heat pump

A heat pump delivers best results when the building itself is energy efficient.

Complementary upgrades include:

• Improved insulation (walls, roof, loft), double or triple glazing, draught sealing and underfloor insulation to reduce heat loss and lower electricity use
• Mechanical ventilation with heat recovery (MVHR) to minimise heat loss through ventilation while maintaining indoor air quality
• Solar thermal systems to support efficient domestic hot water production
• Battery storage, when paired with solar PV, to store excess energy and reduce reliance on the grid

These measures reduce demand and improve overall system efficiency.

Optimising radiators and underfloor heating

Heat pumps work best with low-temperature systems, such as underfloor heating or low-temperature radiators, because these systems allow the flow water temperature to stay lower whilst still providing adequate comfort.

Underfloor heating is often ideal because it provides uniform, gentle heat at lower water temperatures, reducing the workload on the heat pump and improving SCOP. If homeowners retain traditional radiators, it may be necessary to upgrade them (larger radiators, lower flow temperature) to maintain comfort without pushing the heat pump to high operating temperatures, which would eat into efficiency and savings.

Grants and government support

In England and Wales, the Boiler Upgrade Scheme (BUS) is a UK Government incentive that has been extended to 2030 and helps homeowners switch to low-carbon heating.

The scheme currently supports air-to-water heat pumps for space heating, with grants of £7,500 available subject to eligibility and scheme criteria. Air-to-air heat pumps are now included, with grants of up to £2,500 available when installed for space heating, subject to eligibility. 

A temporary increase to £9,000 is expected from July 2026 for homes currently heated by oil or LPG, subject to final Government confirmation and eligibility criteria. As the higher grant is expected to be introduced for a limited period, homeowners considering a switch may benefit from starting the process early. 

To qualify, the installation must replace an existing fossil fuel heating system, such as a gas or oil boiler.

Homeowners in Scotland can apply for a standalone grant of £7,500 from the Home Energy Scotland Scheme to install heat pumps. Previously, applicants were required to sign up for a loan before they qualified for this funding, but they can now access the money directly. The enhanced measures will also include an extra £1,500 for homeowners in rural areas. A standalone grant of £7,500 for energy efficiency improvements to homes is also available.

Heat pump power consumption: what you need to know

Heat pumps offer a compelling combination of high energy efficiency, lower CO₂ emissions, and tangible cost savings when installed and used correctly. Their performance depends on proper sizing, professional installation, good insulation, smart controls, and thoughtful operation. When these conditions are met - and ideally when paired with renewable electricity, like solar panels, and suitable tariffs - heat pumps become a powerful tool for reducing energy bills while minimizing environmental impact.

Key takeaways

• Heat pumps typically produce 4 kWh of heat per 1 kWh of electricity
• Running costs depend on electricity price and home efficiency
• Smart controls and insulation reduce consumption
• Solar panels further improve savings
• Modern systems perform even in cold climates

Ready to reduce your energy consumption and improve efficiency?