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Why You Should Get a New Gas Boiler

Gas Boiler Replacement

A new gas boiler is likely to be the most efficient and affordable heating system for your home. If your property is connected to the gas network then a gas boiler replacement will make your heating system more efficient, kinder on the environment and will simply make your home more comfortable.

What is a gas boiler?

The gas boiler is the most popular boiler type in the UK. And if your property is connected to the gas network, you can have one installed.

Gas boilers heat water in the same way as any other boiler type, the key difference being that it is powered by natural gas. Alternative boiler types to gas include LPG, oil, electricity and biomass, all of which have their own set of benefits but are largely installed in off-grid properties.

A gas boiler burns natural gas to heat water that's either used to provide central heating or hot water. Depending on which is needed at the time. This natural gas is delivered to your property, via the gas network, as and when needed by an energy supplier.

All boilers installed in the UK must now be condensing. This means they capture more heat than a non-condensing boiler. In fact, a condensing boiler can deliver as much as 30% more heat using the same amount of fuel. Making the modern gas boiler far more efficient than ever before.

Why get a new gas boiler?

A new boiler will be nothing but beneficial for your home. Gas boiler technology has come a long way in recent years to make them highly efficient.

"Compared to an older gas boiler – which may well be heating your home right now – modern gas boilers produce more heat using less fuel, are far more reliable and release fewer emissions into the atmosphere."

A new gas boiler could also be future-proof. For the UK to achieve net-zero carbon emissions by 2050, the way we heat our homes must change rather dramatically. Burning fossil fuels, such as gas and oil, releases carbon into the atmosphere. And more than 80% of UK homes are heated using a gas boiler.
Blink: Hydrogen
Now, there's a lot of talk about renewable heating systems – heat pumps, in particular – being the solution here. However, it would be expensive and impractical to fit them into all of those existing homes being heated by a gas boiler.

So, what's the solution? Well, it could be hydrogen.

Hydrogen doesn't emit carbon into the atmosphere when burned and it could be delivered to your property via the existing gas network. Rather than an immediate switch to a 100% hydrogen network, if it was to get the green light, the transition would be gradual. At first, a hydrogen blend made up of natural gas and hydrogen would be delivered to properties.

This makes a modern gas boiler replacement well worthwhile ahead of hydrogen becoming a big part of the future of home heating.




Which type of gas boiler do I need?

There are three types of boiler, including combi, system and regular (conventional) boilers. One is far more likely to be better suited to your home than another.

Combi gas boiler

Combi boilers are the most popular heating system in the UK. They're compact, cost-effective and don't need to be installed alongside any bulky tanks or cylinders. This focus on space-saving design makes them ideal for smaller properties with limited room.

Everything a combi boiler needs to deliver heating and hot water is wrapped up into the boiler itself. This makes it possible for the combi to deliver near-instant heating and hot water on demand.

System gas boiler

In terms of how they work to heat the home, system boilers sit somewhere between combi and regular boilers.

Like a combi, they're directly connected to the mains – that means no tanks in the loft – but, unlike a combi, they store hot water in a cylinder. While this does mean more space needs to be dedicated to the heating system, it allows them to meet higher demands for domestic hot water.

So, if you live in a property with 2 or more bathrooms, then a system gas boiler is likely to be your best option.

Regular or conventional gas boiler

Regular boilers are the oldest type of heating system and go under many names. You may have also heard of regular boilers being referred to as conventional, heat-only, open-vent or traditional boilers too.

While they may be the oldest boiler type, the technology has advanced greatly in recent years to make regular boilers more efficient and reliable than ever.

In addition to the boiler itself, a regular boiler needs to be installed alongside feed and expansion tanks as well as a hot water cylinder. Cold water fills in a tank in the loft which is then fed down to the boiler which heats the water before sending it to hot water outlets or a hot water cylinder.

A new regular boiler should only be considered if your property already has one installed. This is because they're complex to install and need extensive pipework.

Which are the best gas boiler brands?

Blaze: Best Gas Boilers
Gas boilers are by far and away the heating system of choice for homeowners in the UK. As a result, there's no shortage of boiler brands to choose between.

Leading boiler manufacturers include ATAG, Baxi, Ideal, Vaillant, Viessmann and Worcester Bosch. Each of these manufactures a range of combi, system and regular boilers that are widely recommended and covered by extensive warranties.

Boiler Manufacturer ATAG Baxi Ideal Vaillant Viessmann Worcester Bosch
Combi Boilers
System Boilers
Regular Boilers
Longest Available Warranty 14 Years 10 Years 12 Years 10 Years 10 Years 12 Years




How much does a new gas boiler cost?

A new gas boiler, including installation, costs between £1,000 and £3,750. Remember that this is an average and prices could stretch to £4,000 and beyond.

This is because there are many potential variables at play:

  • Type of boiler being installed
  • Boiler manufacturer and model
  • Whether it's a like-for-like boiler replacement (combi replacing a combi, for example)
  • If the boiler is being moved to a new location
  • Rates charged by the installer (we highly recommend comparing quotes to find the most competitive price)
Type of Boiler Average Boiler Cost Average Gas Boiler Installation Cost Potential New Boiler Cost (Fully Installed)
Combi £500 - £2,000 £500 - £1,000 £1,000 - £3,000
System £500 - £2,500 £500 - £1,000 £1,000 - £3,500
Conventional £500 - £2,750 £500 - £1,000 £1,000 - £3,750

Our article on New Boiler Prices & Replacement Costs breaks these costs down even further.

A complete central heating system replacement, including replacement radiators, pipes and possibly a cylinder will add to the cost of the gas boiler replacement. Find out more about this in Costs to Install Central Heating.

How much would a new gas boiler save you?

A new gas boiler could save you up to £315 a year on your heating bills. You read right, £315. That's in addition to the carbon footprint of your property shrinking too.

You will see the biggest savings if your current boiler is G-rated for efficiency. Modern condensing boilers are all A-rated (potentially even higher with relevant controls).

New Gas Boiler Savings

Source: The Energy Saving Trust
To maximise your savings, you'll need to think about the wider heating system, not just how efficient the boiler is:

Get free quotes for a new gas boiler

Blink and Blaze
If the time has come for you to install a new boiler then you'll need to hire a Gas Safe registered engineer. Gas Safe registered engineers are the only people certified to install gas boilers in the UK.

Here at Boiler Guide, we have a network of Gas Safe installers right across the UK. You can connect with those in your area for free by completing our simple online form.

Up to 3 heating engineers will be in touch with you to provide a free no-obligation quote. You'll then be in a position to compare these quotes and be confident you're getting a competitive price from the right person for the job.

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Boiler Guide Team

About the author

Boiler Guide Team

Boiler Guide has been home to a host of heating experts who have helped millions of UK homeowners searching for advice and guidance. If you've got heating questions, we'll have the answers.

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