What’s involved in converting a back boiler to a combi boiler from our Birmingham plumbers


Back Boiler Conversion in Boldmere, Sutton Coldfield – From Quote to Completion | Afterglow Plumbing & Heating



At Afterglow Plumbing & Heating, we recently completed a full back boiler conversion in Boldmere, Sutton Coldfield, transforming an outdated and inefficient heating setup into a modern, energy-efficient system with a Worcester Bosch 8000 35kW combi boiler.


This job perfectly showcases the full process we take our customers through — from the initial quotation to registering the boiler guarantee and demonstrating the smart controls. It also highlights the quality workmanship that makes us one of the most trusted names for boiler installation in Birmingham and surrounding areas.





The Quotation Stage



The customer contacted us after struggling with an old back boiler system that had become unreliable and costly to run. During our initial visit, we carried out a full assessment of the property, checking radiator sizes, water pressure, and gas pipe sizing.


We discussed the benefits of converting to a combi boiler, explaining how a Worcester Bosch 8000 35kW model would deliver improved efficiency, quieter operation, and better hot water flow rates. We also recommended adding TRVs (thermostatic radiator valves) to help control room-by-room temperatures, along with a Bosch EasyControl smart thermostat for full time and temperature control via smartphone.


After explaining the full process, we provided a detailed written quotation outlining the cost, the work involved, and energy savings — something that’s vital for customers planning a long-term investment.





The Installation – Converting from a Back Boiler



On the day of installation, our engineers began by carefully removing the old back boiler unit, which was located behind the living room fireplace — a common setup in older homes around Sutton Coldfield.


We then decommissioned the old header tanks and hot water cylinder from the loft and airing cupboard, freeing up valuable space.


The new Worcester 8000 combi boiler was installed in the kitchen, allowing for easier access and future servicing. We upgraded the gas supply to 22mm to meet the manufacturer’s requirements and reconfigured the pipework for optimal efficiency and aesthetics.


While running the new condense and flue systems, we encountered a small challenge — the property’s external wall space was limited due to an extension. After some clever rerouting and coordination with the homeowner, we managed to find a neat and compliant flue position that met Gas Safe regulations without compromising the property’s appearance.





Upgrading Radiators and Controls



As part of the installation, several of the customer’s old single-panel radiators were replaced with modern, energy-efficient double-panel convectors. This not only improved heat output but also made the system much more responsive to the new smart thermostat and TRVs.


Once the Bosch EasyControl thermostat was connected, we helped the customer set up their preferred heating schedule. They loved how easy it was to control temperatures in each room directly from their phone, giving them comfort and control wherever they are.





Commissioning and Registering the Guarantee



After flushing the system, adding inhibitor, and carrying out a full safety check, we commissioned the new Worcester Bosch 8000 and registered the installation for the extended manufacturer’s guarantee.


We also provided the customer with all relevant paperwork, including the Gas Safe certificate, and made sure they understood how to get the best out of their new heating system.





Customer Feedback



The homeowner was delighted with how smoothly the job went and particularly impressed by the neatness of the pipework and how tidy our engineers kept their home. They noticed the difference in water pressure immediately and were happy knowing their new boiler was not only energy-efficient but also covered by a full manufacturer guarantee.





Why Choose Afterglow for Your Boiler Installation



If you’re considering a back boiler conversion or need a boiler installation in Sutton Coldfield or anywhere in Birmingham, Afterglow Plumbing & Heating can guide you through every stage of the process — from choosing the right model to registration and aftercare.


We’re proud to be trusted Gas Safe engineers who specialise in boiler installation Birmingham and boiler replacement services across the West Midlands.


Get in touch today for a free, no-obligation quote and find out how we can make your home warmer, smarter, and more efficient.