A common question that we get is “How much is a new boiler?”. Depending on the type, a new boiler’s cost and installation can widely vary in price.

The average cost of a new boiler can range from £625-750 for a small domestic boiler, to £2,500 for premium domestic models, all the way up to £7.5k or 8.75k for a large commercial unit. New combi or system boilers are, as a rule, cheaper than conventional heat-only boilers.

The cost of getting a new boiler fitted can depend to some extent on the boiler you’re getting, as well as the installation location. A straight replacement in the same spot, for example, will cost far less to install than a completely new, different boiler in a different location. This is because new pipework will need to be fitted on top of any necessary modifications to the location itself.

Types of Boilers & Their Prices

Below, you will find some typical prices for various boiler replacement scenarios, do keep in mind this is a ball park figure and they can change depending on the current climate and inflation standards. Nonetheless, these example costs include boiler, labour, parts and VAT – and we’ve included a power flush as standard.

Conventional (heat only) boiler

Regular boilers are heat-only devices. The boiler provides the heating and a cylinder provides hot water. The scenarios below show costs for replacing a regular boiler in its existing location, and for installing a new regular boiler in a new location.

The cost of moving the boiler will depend on whether it will be in the same room or moved to another room. Both of these prices assume that the cylinder and other equipment not directly related to the boiler remain in the same place.

• Replacing a heat-only boiler in the same location: £2,937 (2 days)
• Replacing a heat-only boiler in a new location: £3437 (2.5 days)

Assumed mid-range boiler cost of £1000.

Combi Boiler

Combination boilers provide both heating and hot water via the boiler, with no need for a cylinder to perform this function. Usually, a combi boiler installation will consist of either replacing an existing combi boiler or replacing a conventional boiler and hot water cylinder together.

Replacing an existing combi boiler

Here, we show approximate costs for a new combi boiler in situ, and in a new location.

• Replacing a combi boiler, same location: £2,937 (2 days)
• Replacing a combi boiler, new location: £3,687 (2.5 days)
• Replacing a regular boiler & hot water cylinder with combi boiler: £4,250 (3 days)

This kind of replacement might need extensive additional work to remove the cylinder and redirect pipes to the new boiler location.

• Replacing a conventional boiler & tank with combi boiler: £4,062 (3 days)

Assumed mid-range boiler cost of £1125.

Side Note: Any combi boiler replacement needs to be Boiler Plus compliant. Boiler Plus, which came into effect in April 2018, sets out revised energy efficiency and technical requirements for any new or replacement gas boilers being fitted in England.

The scheme stipulates that timing and temperature controls are required in new or replacement combi boilers An additional energy efficiency measure is required, such as weather compensation, load compensation, Flue Gas Heat Recovery, or smart heating controls. Each compliance method can be tailor-made for the customer’s requirements.

System Boiler

System boilers use an unvented tank to provide hot water and provide heating. System boilers offer excellent performance and are suitable for buildings with multiple bathrooms in use.

Typical scenarios involve replacing an old system boiler in the same location, replacing a conventional boiler & vented cylinder with a system boiler & unvented hot water tank, and replacing a combi with a system boiler/unvented hot water tank (standard for property extensions).

• Replacing a system boiler, retaining the unvented hot water tank: £2,875 (2 days)
• Replacing a conventional boiler/hot water tank with system boiler/unvented hot water tank: £5,562 (3-4 days)
• Replacing a combi boiler with system boiler/unvented hot water tank: £5812 (3-4 days)

Assumed mid-range boiler cost of £1062.

Back Boiler

Back boilers are no longer installed, so the costs we will go through here are for replacing a back boiler with a newer boiler. A conventional boiler can be installed, retaining the hot water tank, or a combi boiler can be installed without the tank.

• Replacing a back boiler with a new heat-only boiler, retaining the hot water tank: £3,937 (3 days)
• Replacing a back boiler and hot water tank with a new combi boiler: £4,312 (3 days)

Assumed mid-range boiler cost of £1062.

Frequently Asked Questions

Can I Install A Boiler Myself

It is strongly advised to hire a commercial boiler installation team to install your boiler. The installation of a boiler typically requires professional expertise and certification. This is because it is an incredibly complex process that involves not only the fitting of the boiler itself but also the connection to water, gas and electrical systems.

It is also critical to comply with building regulations and safety standards as there are significant safety risks including gas leaks, carbon monoxide poisoning, and potential damage to property.

Is It Worth Getting A New Boiler or Should I Stick To Repairs?

In the UK getting a new boiler is often ‘worth it’ for several reasons as new boilers are energy efficient this leads to lower bills and reduced emissions. They are also more reliable, requiring fewer repairs and maintenance saving you money in the long term.

Upgrading improves heating performance and can increase property value. The investment in a new commercial boiler installation can lead to more comfort, savings and higher resale value for homeowners.

How Often Should I Replace My Boiler

The typical lifespan of a boiler is around 10 to 15 years but the actual lifespan can vary depending on factors such as the type of boiler, its usage and how well it has been maintained. M&E maintenance can extend the lifespan of your systems significantly, look out for signs of wear and tear, increased noise, reduced heating performance and higher energy bills as it may be time to replace it. Regular commercial boiler servicing by a qualified engineer can help assess the condition of your boiler and determine if replacement is necessary.

Before You Go…

The cost of each boiler installation depends on the individual building, the existing setup and the new boiler’s specific requirements. Additional factors such as construction costs and individual access requirements can also further drive up expenses.

Expect to pay upwards of £1,250 in any circumstance, plus the cost of the boiler itself, and block out 2 or 3 days for the installation. For more information on how Kiasu Workforce can help you with commercial boiler installations, get in touch with us today.