Heat pump vs gas boiler: Which is right for you?

If you’re looking for a new heating system for your home, you may be wondering whether a heat pump or a gas boiler is the best option.

While gas boilers have been the most common heating option in UK homes for decades, the Government’s Net Zero Strategy, which aims to eliminate the country’s net carbon emissions by 2050, seeks to change this by gradually moving UK households away from gas boilers. As a result, environmentally friendly heat pumps are being touted as the answer to low-carbon household heating.

So, should you choose a heat pump over a traditional gas boiler? In this guide, our experts have compiled all the important information you need to make an informed decision. Our guide to heat pumps can also help you better understand this increasingly popular appliance.

Read our full gas boilers guide for expert advice on choosing your heating system.

How do heat pumps work differently from gas boilers?

Gas boilers generate heat by burning gas to heat water that flows through the central heating system. While this is effective, it relies on burning fossil fuels, which produce carbon emissions that can harm the environment. Our gas boiler guide gives more in-depth coverage of how this works if you’re looking to learn more.

Heat pumps extract energy from the air using refrigerants with very low boiling points. As air passes through the heat pump, energy is transferred to the refrigerant, causing it to boil and become a gas. It’s then compressed to increase its energy and temperature even further, and this energy is transferred to the water that flows through the heating system.

It is worth noting that modern gas systems have also advanced; high-efficiency condensing boilers now recycle their own exhaust gases, maximising fuel use and significantly reducing emissions compared to older models.

Heat pump vs gas boilers: benefits and drawbacks

The table below provides an at-a-glance view of how heat pumps fare in terms of cost, installation, efficiency, running costs, and maintenance. Our sections below cover these in more detail, including further considerations and factors to bear in mind with each.

Gas boilers 

Here is the same table on gas boilers for comparison. These numbers are affected by variable factors that we cover in the sections below.

Heat pump vs gas boiler expenses

A significant factor when choosing between gas boilers and heat pumps is the upfront cost. The purchase and installation costs of heat pumps can range from £7,000 to £13,000, considerably more than the £1,000 to £4,000 average for gas boilers.

However, it is important to note that many UK homeowners installing a heat pump are eligible for a grant of up to £7,500, significantly reducing the upfront cost. While some homeowners may not have previously been eligible for this grant, the Energy Performance Certificate (EPC) requirements have been relaxed, and you no longer need loft or cavity wall insulation to apply. To see what other financial assistance options exist for home improvements, check out what boiler grants are available to homeowners.

Heat pump vs gas boiler running costs

The running costs of your heating system depend on the price of its fuel. A heat pump is powered by electricity, whilst a gas boiler is, you guessed it, gas-powered.

Electrical energy is typically more expensive than gas. However, from 1st October 2026, the UK government will be cutting the 5% VAT on electricity, saving users £45 a year on average. This is just in time for the winter months, reducing the running costs of your heat pump when you need it most. Unfortunately, VAT is not being cut for gas at this time. 

Certain energy companies also offer tariffs specifically for heat pumps to reduce the costs, such as: 

• Cosy Octopus, which offers 3 periods of low energy costs per day

• OVO Weekend Warmer, which allows you to run your heat pump for free on Saturday and Sunday

• EDF Energy’s twice-daily discount

If you stay with gas, you can learn how to make your boiler as energy efficient as possible to keep monthly bills under control.

Heat pump vs gas boiler installation timelines

As gas boilers are so common, there are plenty of Gas Safe installers who are qualified to fit them. Plus, this installation is fairly fast, often taking less than a day and sometimes as quickly as four hours.

See our guide on how long it takes to fit a boiler for a more accurate estimate of the time it will take in your home.

On the other hand, fewer engineers are familiar with fitting heat pumps. That’s why we created our Logic Air heat pump, specially designed for boiler installers, with a compact monobloc system, low clearances and a single communication cable.

Heat pump vs gas boiler efficiency

Gas boilers are fairly efficient, usually offering around 90-94% efficiency - meaning the heat energy emitted is 90-94% of the energy used in gas. This is because a small amount of heat energy is lost through your boiler’s flue.

On the other hand, one of the most significant heat pump benefits is that they are 300-400% efficient, meaning the heat energy output is three to four times more than the electricity input. With Ideal heat pumps, this can often be even more, with the Logic Air capable of reaching 500% efficiency in lab-tested conditions. Although this efficiency may be slightly lower in practice, it remains impressively high.

Heat pump vs gas boiler servicing requirements

Both heat pumps and gas boilers require annual servicing to ensure they are running properly, including inspection of components and cleaning.

As boilers are so popular, all Gas Safe engineers will be confident in servicing them, while some may be unfamiliar with heat pump servicing. This is changing rapidly, though, as heat pumps become more common. Our guide on what to expect from heat pump servicing can offer more advice.

Property suitability and practical considerations

One of the biggest factors in determining whether a heat pump or gas boiler is right for you is knowing which is right for your property.

Heat pumps are most effective in homes with modern radiators or underfloor heating, whilst older radiators are often more compatible with gas boilers. This is because heat pumps are more effective at providing low levels of heat consistently than at delivering large, quick bursts like a boiler. Modern radiators and underfloor heating are both more effective at spreading lower levels of heat around the home.

Heat pumps are also best suited to homes with some outdoor space, as they have both an outdoor and an indoor unit. This unit may require some garden space or just a large outdoor wall space with clearance from doors and windows, depending on the size of the outdoor unit.

On top of this, there are certain Government rules regarding eligibility for a heat pump grant, with new builds and social housing excluded. See our guide, ‘Should I Install a Heat Pump in My Home,’ for more guidance on which homes are suitable for heat pumps.

Are heat pumps quieter than gas boilers?

Air heat pumps and gas boilers emit a similar level of sound - around 40 - 60 decibels. However, if you’re worried about sound, our Logic Air heat pump is Quiet Mark certified.

The heat pump is also located outside the home, further limiting any potential disturbance to you.

Cold climates: heat pump or gas boiler?

An analysis by Oxford University and the Regulatory Assistance Project (RAP) found that heat pumps are more than twice as efficient as gas boilers in low-temperature environments. Heat pumps are incredibly popular in cold-climate countries such as Norway, with one heat pump for every 3.4 people as of April 2023.

Will heat pumps replace gas boilers?

Ultimately, the UK Government aims for heat pumps to become more prevalent and replace gas boilers. The target is that by 2035, there will be an 80% ‘phase out’ or reduction in gas boilers, although no existing, functional gas boiler will be forcibly removed.

Is a heat pump better than a gas boiler?

Both heat pumps and gas boilers offer significant benefits, and choosing the right one for you depends on numerous factors, from your budget to the type of home you live in. At Ideal Heating, we offer both gas boilers and heat pumps so you can choose the heating system that’s right for you.

Over on our blog, you can learn more about both heating types to make the right decision; see our guides to gas boilers and heat pumps for further information on each.