Boiler Installation Kings Lynn: Back Boiler to Combi

Our boiler installation Kings Lynn team completed a full heating system upgrade this week, removing a traditional back boiler and fire from a property undergoing renovation and installing a modern Baxi 830 combination boiler with a 10-year guarantee. We stripped out the old pipework, fitted a new central heating system throughout with thermostatic radiator valves, and ran a fresh gas supply from the meter to the new boiler location.

Back boiler removal and boiler installation Kings Lynn

Rob, Rhys and Gary worked on a property in King’s Lynn that’s currently being fully renovated by its new owner. The original heating came from a back boiler — one of those robust, long-lasting units built into the chimney breast behind a gas fire. While it’s always a shame to see such well-made equipment go, the homeowner needed a modern, efficient system that would free up living space and deliver hot water on demand.

We began by safely isolating and removing the back boiler, the gas fire surround, and all the old heating pipework throughout the property. This gave the renovation a clean slate and opened up space in the room where the fire once stood.

New central heating system installation

With the old system out, we installed a complete new central heating system from the ground up. The work included:

• New pipework run throughout the property to serve every room
• Radiators installed in each zone with thermostatic radiator valves for independent temperature control
• Removal of a kitchen cupboard to create space for the new boiler
• Installation of the Baxi 830 combination boiler, which provides both central heating and instant hot water without the need for a separate cylinder
• New gas supply run from the meter to the boiler location, ensuring safe, compliant gas delivery

The Baxi 830 is a reliable, compact combination boiler ideal for homes without room for a hot water cylinder. It comes with a 10-year manufacturer guarantee when installed and registered by a Gas Safe engineer, giving the homeowner long-term peace of mind.

Why upgrade from a back boiler to a combi?

Back boilers were built to last and many are still running decades after installation. However, they’re far less efficient than modern condensing boilers, and they take up valuable space in the chimney breast and airing cupboard. A combination boiler delivers heating and instant hot water in a wall-hung package, often freeing up an entire cupboard and improving energy efficiency by 25% or more.

For homes undergoing renovation, a boiler replacement is the perfect opportunity to reconfigure the heating layout, add modern controls, and future-proof the system. All our gas work is carried out by Gas Safe registered engineers, and we test and commission every installation to current Building Regulations.

Frequently asked questions

Can you remove a back boiler and install a combi in one day?

Most back boiler removals and combi installations take two to three days, depending on the extent of pipework changes and whether we’re relocating radiators or running new gas supplies. We’ll give you a clear timeline after the survey.

Do I need to replace all my radiators when upgrading from a back boiler?

Not necessarily. If your existing radiators are in good condition and sized correctly, we can often reuse them. We’ll assess each radiator during the survey and recommend replacements only where needed for efficiency or aesthetics.

What size combi boiler do I need for a three-bedroom house?

A typical three-bedroom home with one bathroom suits a 28–30 kW combi boiler. Larger properties or homes with multiple bathrooms may need a 35–40 kW model. We’ll calculate the correct output based on your radiator count, hot water demand and property size.

How long does a Baxi boiler guarantee last?

Baxi offers up to 10 years’ parts and labour warranty when the boiler is installed by an approved Gas Safe engineer and registered within 30 days. We handle the registration for every boiler we fit.

Boiler installations across King’s Lynn and Norfolk

This King’s Lynn system is now ready for winter, delivering efficient heating and instant hot water whenever the new owner needs it. If you’re renovating, replacing an old back boiler or upgrading your heating system anywhere in King’s Lynn, Norwich, Thetford or across Norfolk, our Gas Safe registered team is ready to help. Visit our boiler installations page for more information or get in touch to arrange a free, no-obligation survey and quote.