Heat pump vs boiler is the choice we are now all making when it comes to installing a new heating system for our home. All of us are aware that in the long term we will have to make the switch to sustainable systems such as air source heat pumps. However, in the here and now, finding the right heating solution means achieving a balance between upfront costs, long-term savings, and sustainability.
Here at Lewingtons we’re pioneers in green energy systems, having set up our Lewington Renewable division back in 2000. As a result, we’re the trusted local experts in this ever-growing sector. However, we continue to install a great many new boilers, and as such we are perfectly placed to advise on the best option for those choosing between air source heat pumps or modern gas or oil boilers.
You can call us on 0116 433 333 or fill in our contact form to speak to one of our experts. In the meantime, read on to get help with making an informed decision with our support.
What is an air source heat pump?
Air source heat pumps are renewable heating systems that extract heat from the outside air to provide heating and hot water for your home. Even in the depths of winter, these systems can operate efficiently, making them a key player in eco-friendly heating solutions.
What is a boiler?
We have all grown up with the traditional gas boiler which burns fuel; typically gas but sometimes oil, to generate heat. Boilers have been the go-to option for decades, and while it’s true that older ones can be inefficient, it’s important to remember that far from being dinosaurs that should be consigned to the past, the modern gas boilers we install feature comparatively impressive energy-efficient capabilities to their older counterparts.
What do they cost?
Upfront costs
There is no denying that the installation cost of an air source heat pump system is higher than that for a gas boiler, with the amount typically ranging from £8,000 to £14,000 in March 2025. However, the government’s Boiler Upgrade Scheme can significantly reduce this investment for those who choose to act now with installing a sustainable system. You can find the latest information on the grants available on our funding page. Taken into account alongside the environmental and longer-term potential cost savings, there has never been a better time to invest in an air source heat pump from a financial point of view.
The initial cost of a new boiler is much lower, averaging between £2,500 and £5,500. However, in the long term your system may cost more to run and opting for a traditional system now may mean you miss an opportunity to take advantage of the Boiler Upgrade Scheme. However, we all have unique needs, and we may advise that a modern gas or oil boiler is the best choice for you.
Have a look at our handy decision tree to get a quick idea of which option may be best for your needs.
Running costs
Lower running costs are one the greatest strengths of air source heat pumps, thanks to their ability to deliver three to four times the energy they consume.
While modern boilers are far more efficient than older models, they are by their nature less efficient than sustainable alternatives, and their reliance on fossil fuels means their running costs will fluctuate with gas prices.
Efficiency and insulation
Generally speaking, air source heat pumps are extremely efficient, particularly in homes with underfloor heating or larger radiators. However, their performance can drop in properties with poor insulation, and they work to their optimum level in houses with an EPC energy rating of C or above. If you think your insulation may not be at the standard required for a heat pump, it may be worth exploring improving your insulation to meet the required standard and to enhance your home’s energy efficiency more generally.
Modern boilers also achieve high levels of efficiency, and if you replace an old and ailing boiler, you will certainly notice an instant and marked improvement in your boiler’s performance.
What works best with my existing heating system?
Air source heat pumps work brilliantly in conjunction with underfloor heating, which is why many people install both at the same time when replacing old heating systems or building a new home. However, your new air source heat pump can also work well in conjunction with your existing radiators, provided they are big enough. In this scenario, we can visit you to assess whether your radiators are big enough and advise on any necessary replacements.
When it comes to modern boilers, these can work in conjunction with both underfloor heating and traditional radiators.
The sustainability factor
If sustainability is a priority for you, clearly air source heat pumps are the winner. By using renewable energy, they significantly reduce your home’s carbon footprint. Switching to a heat pump could cut your household emissions by up to 50%, helping you to do your bit to tackle climate change.
Modern boilers contribute to greenhouse gas emissions. However, as we have seen, in recent years the technology has improved to make them far more efficient than before. This means they are still very much an option for many people for whom sustainability is one of many considerations when making their choice.
How much space is required?
Air source heat pumps require an outdoor space of around 1 x 08m to install the unit, so this is obviously a factor to consider if garden or patio space is limited. Gas boilers take up less space, making them suitable for homes with limited outdoor space.
When it comes to indoor space, an air source heat pump requires a hot water cylinder, which is typically stored in an airing cupboard. Where indoor space is scarce, a compact combi boiler is a great solution as it doesn’t require a separate water cylinder.
Maintenance and longevity
Both air source heat pumps and modern boilers are built to efficiently serve you for many years to come and these days both will do so with no noticeable background noise.
Generally speaking, an air source heat pump should require less maintenance than a boiler, but you can expect hassle-free longevity from your boiler too. For both types of systems, we recommend an annual service to keep your heating ticking over efficiently.
So, which is best, heat pump or boiler?
As we have seen there is no cut and dried answer to this as your choice comes down to your priorities, your budget and your home’s location.
If you’re focused on long-term energy efficiency and helping the environment, and have the space, an air source heat pump is ideal, particularly with government incentives softening the upfront cost.
If you need a budget-friendly solution for immediate installation, a modern boiler remains an excellent choice for many homes.
Contact us today to find the right solution for you
Choosing between an air source heat pump and a new boiler is a significant decision, but understanding the pros and cons of each solution is the first step. We are here to help you get this right and to offer our expertise, from initial planning through to installation and maintenance. Call us on 01858 433 333 or fill in our contact form to get the process started.
