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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: November 13, 2023. Updated: April 5, 2024

Can a combi boiler go in the loft?

We get asked a lot, can a combi boiler go in the loft? And the answer is, yes.

Installing a combi boiler in loft can be an appealing option when looking to save space and improve the aesthetics of their living areas by removing boilers and pipework. However, there are several considerations and regulations to be aware of.

Pros and cons of a boiler in loft

Pros

  • Space Saving

    Boilers and tanks in the loft free up living space.

  • Improved Aesthetics

    Moving the boiler out of sight can enhance the look of your home.

  • Reduced Noise

    Operational sounds are less likely to be heard from the loft.

Cons

  • Temperature Damage Risk

    Extreme temperatures in the loft can damage the boiler, though roof insulation can mitigate this.

  • Inconvenience

    Regular checks and maintenance may become more cumbersome. This includes adding pressure to the central heating system and if your boiler needs resetting (which can happen). The loft will need to be boarded up to and around the boiler for engineer access.

  • Boiler Performance

    Distance from the boiler to water outlets can delay hot water delivery.

  • Set-up Costs

    Additional pipework and installation of utilities can increase costs.

  • Pressure issues

    The higher the the boiler in a building, the lower the pressure at the boiler. If you have low mains water pressure, it would mean a loft-based combi could cause issues.

  • Flue installation cost

    The higher the boiler the more difficult a flue installation might become. This could push the price of installation up.

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Regulations

  • Plumbing and Electricity

    Proper plumbing and electrical connections are needed, which may vary based on the boiler type.

  • Isolation Points

    Utilities must have isolation points for safety and emergency purposes.

  • Ventilation

    A vent is required to safely expel combustion gases and must be installed on an external wall.

  • Access

    Safe access for maintenance is mandatory, including boarded flooring, a ladder with a handrail, and adequate lighting.

Costs

The cost of moving a boiler to the loft varies based on factors like boiler type, property layout, and pipework changes. It typically ranges between £300 and £600. It’s usually more cost-effective to consider loft installation when replacing an old boiler for a new one, rather than relocating an existing one.

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Summary

In summary, while there are benefits to installing a boiler in the loft, such as saving space and reducing noise, there are also risks and additional costs to consider. Extreme temperature changes in the loft can potentially damage the boiler, and the inconvenience of accessing the loft for checks and maintenance should not be overlooked.

If you’re considering such an installation or relocation, it’s crucial to consult with a Gas Safe registered heating engineer for tailored advice and a specific quote.

Frequently asked questions

When physically moving an existing boiler, we would suggest it’s no worth it. But, if you are looking at replacing your existing boiler, or are looking at swapping your current system for a new setup it could be worth considering putting the boiler in the loft.

Temperature Damage Risk: Extreme temperatures in the loft can damage the boiler, though roof insulation can mitigate this.
Inconvenience: Regular checks and maintenance may become more cumbersome.
Boiler Performance: Distance from the boiler to water outlets can delay hot water delivery.
Set-up Costs: Additional pipework and installation of utilities can increase costs.

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Save up to £590 PER YEAR on your heating bills.
Quote in 30 seconds. No obligation. Next Day installation.
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