--- title: "Boiler Conversion | Northstar Plumbing" description: "Convert your boiler type safely, from conventional or system to combi where suitable. Assessment, installation, commissioning and Building Regs sign-off." canonical: "https://www.northstarplumbing.co.uk/services/boiler-conversion" --- ![Technician adjusts copper pipes beneath a white wall-mounted boiler](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Ftechnician-adjusts-copper-pipes-boiler.jpg%3Fv%3D1768575128662&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ) Boiler Installation & Replacement # Boiler Conversion [Contact Us](https://www.northstarplumbing.co.uk/redirect) A boiler conversion changes the type of boiler and hot water setup in your property, for example converting from a conventional or system boiler to a combi where suitable. It is ideal when you want better hot water performance, free up space, or replace ageing equipment with a modern, compliant system that is correctly sized and commissioned. ## What a boiler conversion covers A boiler conversion is more than a like for like swap. It updates how your heating and hot water are produced and controlled, with safety and compliance built in. - Suitability survey of your current heating and hot water system - Checks on mains water pressure and flow (especially for combi conversions) - Removal of redundant equipment, such as hot water cylinders and loft tanks where applicable - Installation of the new boiler and any required system components - Pipework alterations needed to connect and balance the system correctly - Installation or upgrade of controls (thermostat, timers, TRVs where required) - System clean and inhibitor dosing, plus filters if recommended - Commissioning, testing and setting the boiler up to manufacturer specifications - Gas Safe and Building Regulations compliance paperwork ### When a boiler conversion is the right choice This service suits you if your current setup no longer matches how you live or manage the property. Typical reasons include improving shower performance, reducing waiting time for hot water, releasing cupboard space, or replacing a boiler that has become unreliable. It is also a practical option for landlords and small commercial premises where dependable heating, clear documentation, and predictable maintenance are priorities. ### How the conversion is delivered The work starts with a survey to confirm the best boiler type and size, and whether any upgrades are needed to pipework, flue position, ventilation, or controls. You will then receive a clear scope of works so you know what is included before installation day. On the day, the old equipment is isolated and removed safely. The new boiler is installed, connected to the heating and hot water system, and the system is flushed or cleaned as required. Finally, the boiler is commissioned and tested, and you are shown how to use the controls. ### After installation: performance, documentation and next steps Once commissioned, the system is checked for correct operation and balanced where needed so radiators heat evenly. You will receive the relevant compliance certification and guidance on servicing intervals to protect efficiency and reliability. If you want to optimise running costs, you can also request advice on control settings and simple upgrades that improve comfort without overcomplicating the system. [Contact Us](https://www.northstarplumbing.co.uk/redirect) ## Frequently Asked Questions Can any property be converted to a combi boiler? Not always. A combi conversion depends mainly on mains water pressure and flow, plus whether your heating circuit and pipework are suitable. A survey confirms what will work best and what changes, if any, are needed. How long does a boiler conversion take? Many conversions are completed within 1 to 2 days, but more complex jobs can take longer. Timescales depend on pipework changes, flue routing, and whether cylinders or tanks need removing. Will you need to remove my hot water cylinder or loft tanks? If you are converting to a combi boiler, the cylinder and any cold water storage tanks are usually removed as they are no longer required. For system boiler conversions, the cylinder typically stays in place. Do radiators or pipework need upgrading during a conversion? Sometimes. If pipework is undersized, the system is sludged, or radiators are poorly matched, upgrades may be recommended to protect the new boiler and improve heat output. This is confirmed during the initial assessment. What certificates and paperwork will I receive? You should receive Gas Safe and Building Regulations compliance documentation for the installation, along with the boiler commissioning record. These documents are important for warranties, home sales, and landlord compliance. [Contact Us](https://www.northstarplumbing.co.uk/redirect) ## Related Services Complete your experience with these services - System Boiler Installation [View](/services/system-boiler-installation) - Replacement Boiler with Powerflush [View](/services/replacement-boiler-with-powerflush) - Oil Boiler Installation [View](/services/oil-boiler-installation) - LPG Boiler Installation [View](/services/lpg-boiler-installation) Show more services - Conventional Boiler Installation [View](/services/conventional-boiler-installation) - Combi Boiler Installation [View](/services/combi-boiler-installation) - Boiler Upgrade [View](/services/boiler-upgrade) - Boiler Replacement [View](/services/boiler-replacement) - Boiler Relocation [View](/services/boiler-relocation) - Boiler Installation with Controls Upgrade [View](/services/boiler-installation-with-controls-upgrade) - Boiler Installation for Landlords [View](/services/boiler-installation-for-landlords) - Boiler Installation Survey [View](/services/boiler-installation-survey) - Boiler Installation & Commissioning [View](/services/boiler-installation-and-commissioning) - Boiler Installation [View](/services/boiler-installation)