Replacing your boiler with a heat pump

Switching from a gas boiler to a heat pump is a significant upgrade for a more efficient, cost-effective, and environmentally friendly home heating system. This guide will help you understand the technology, assess your home's suitability, navigate costs and grants, and optimise your new system for maximum savings.

Is a heat pump right for your home?

Moving from a traditional boiler to a heat pump means embracing a new heating technology. Heat pumps offer a modern approach to home heating, using ambient energy for significantly improved efficiency.

Understanding heat pump technology

Heat pumps operate differently from conventional boilers. Instead of burning fuel, they extract heat from the outside air (air source heat pumps) or the ground (ground source heat pumps) and transfer it into your home. This process is highly efficient; air source heat pumps typically achieve efficiencies of 300% to 500%, meaning they produce 3 to 5 kWh of heat for every 1 kWh of electricity consumed. This makes them a low-carbon heating solution, substantially reducing your home's carbon footprint compared to fossil fuel boilers.

Benefits of switching from a boiler

The primary advantages of moving to a heat pump include reduced carbon emissions and potentially lower running costs. Heat pumps contribute to a cleaner energy future by reducing reliance on fossil fuels. The Boiler Upgrade Scheme (BUS) also offers substantial grants to help with the upfront cost of installation, making the transition more accessible.

Assessing your home's suitability

Before committing to a heat pump, it is crucial to assess your home's suitability. This includes evaluating your current insulation levels and existing heating system. Heat pumps operate most efficiently in well-insulated homes, as they deliver heat at lower flow temperatures than traditional boilers. This might mean your home requires upgrades to insulation or larger radiators to maintain optimal comfort. Misconceptions about heat pump effectiveness in colder UK climates are common, but modern systems are designed to perform well even in low temperatures.

Heat pump versus gas boiler: key differences

Efficiency and environmental impact

Heat pumps are considerably more efficient than gas boilers because they move existing heat rather than generating it. Air source heat pumps typically achieve efficiencies of 300% to 500%. In contrast, even the most efficient gas boilers rarely exceed 90% efficiency. This difference translates directly into a significant reduction in your home's carbon emissions.

Running costs and energy consumption

While electricity is generally more expensive per unit than gas, the high efficiency of heat pumps can lead to lower overall running costs. The average UK home uses around 2,500 kWh of electricity and 9,500 kWh of gas per year. With a heat pump, a substantial portion of your heating demand is met by ambient heat, not directly by electricity generation. Fuse Energy's commitment to delivering the cheapest, cleanest energy possible, combined with smart tariffs and an intuitive app, can help homeowners optimise their heat pump's energy consumption, potentially leading to further savings.

Comfort and heat delivery

Heat pumps typically operate at lower flow temperatures (e.g., 35-45°C) compared to gas boilers (e.g., 70°C). This means they provide a consistent, gentle warmth rather than intense bursts of heat. For optimal comfort, this often requires good home insulation and potentially larger radiators or underfloor heating to effectively distribute the heat. Addressing these factors during the planning stage ensures your home remains warm and comfortable.

Heat pump installation: costs and grants

Typical installation costs

The upfront cost of installing an air source heat pump in the UK typically ranges from £7,000 to £15,000 before any grants are applied. This cost can vary depending on factors such as the size of your home, the complexity of the installation, and any necessary upgrades to your existing heating system.

The Boiler Upgrade Scheme (BUS)

The BUS is a government initiative in England and Wales designed to encourage homeowners to install low-carbon heating systems. The scheme provides a grant of £7,500 for air source and ground source heat pumps1. For households moving off heating oil or LPG, an increased grant of £9,000 is available until March 2027. The BUS is administered by Ofgem.

Other potential costs

Beyond the heat pump unit and its installation, you might incur other costs. These could include upgrading your home's insulation, replacing existing radiators with larger ones, or installing underfloor heating to ensure the heat pump operates effectively. Any necessary changes to pipework or your hot water cylinder would also add to the overall expense.

The heat pump installation process

Finding an MCS-certified installer

To be eligible for the BUS grant, your heat pump installation must be carried out by an MCS-certified installer. MCS certification ensures that the installer meets stringent quality standards for both the products used and the installation process. It is essential to obtain multiple quotes from MCS-certified professionals to find the best fit for your home and budget. Fuse Energy does not install heat pumps.

What to expect during installation

The installation process typically involves removing your old boiler, installing the outdoor heat pump unit, connecting it to your indoor heating system, and potentially upgrading radiators or pipework. The installer will also set up the controls and ensure the system is commissioned correctly. Installation usually takes around two to five days.

Post-installation checks and setup

After installation, your installer will conduct thorough checks to ensure the system is operating efficiently and safely. They will also guide you through how to use your new heat pump system and its controls. Understanding how to optimise your settings is key to maximising its performance and energy savings.

Maximising your heat pump's efficiency and savings

Optimising your home's insulation

The performance of your heat pump is heavily dependent on your home's thermal efficiency. Investing in good insulation for walls, loft, and floors will significantly reduce heat loss, allowing your heat pump to work less to maintain a comfortable temperature. This directly translates to lower electricity consumption and reduced running costs.

Smart controls and energy tariffs

Smart controls allow you to manage your heat pump's operation more effectively, often learning your heating preferences and adjusting schedules automatically. Pairing these controls with smart energy tariffs can further enhance savings. Fuse Energy's app and smart tariffs can help you optimise your heat pump's energy consumption by encouraging usage during periods of abundant, clean, and cheaper energy. This approach aligns with Fuse's vision of providing "power to play with," giving you greater control over your energy use and bills.

Long-term maintenance and performance

Regular maintenance is crucial for ensuring your heat pump operates at peak efficiency throughout its lifespan. This typically involves annual servicing by a qualified technician. Proper maintenance helps prevent issues, maintains efficiency, and can extend the life of your system, protecting your investment and ensuring consistent home comfort.

Making the switch to a heat pump is a big decision, but with the right information and support, it can lead to a warmer, more efficient home and lower energy bills. Fuse Energy is here to support your journey towards a smarter, more sustainable home by providing clear energy pricing, real-time usage data, and 24/7 human customer support. We believe in making energy abundant and accessible, empowering you to take control of your home's consumption.