A full strip-down service on a Worcester Greenstar HE Plus ZWBR 7-30 in Great Barr, photographed as we went. With the burner out, the heat exchanger and electrodes were coated in deposits. We gave it a thorough clean, fitted a new burner gasket and dosed the heating system with inhibitor.
On Tuesday 3 November we carried out a full strip-down service on a Worcester Greenstar HE Plus ZWBR 7-30 in Great Barr. With the burner taken out, the inside of the heat exchanger and the electrodes were coated in white and orange deposits. We gave the combustion side a thorough clean, fitted a new burner gasket, put the boiler back together and dosed the heating system with inhibitor. Our flue gas analyser then read a CO/CO2 ratio of 0.0004.
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Basic service £95, intermediate £125, full strip-down £185.
No travel charge within 10 miles of B20 2JS. Further out, £2 per mile may apply — always agreed before anything is booked. Full price list
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On Tuesday 3 November we carried out a full strip-down service on a Worcester Greenstar HE Plus ZWBR 7-30 in Great Barr. The first photo is the boiler with its case off.
With the burner taken out, the inside of the heat exchanger was coated in white and orange deposits, and so were the electrodes, as you can see in the second and third photos.
We gave the combustion side a thorough clean; the fifth photo shows the same heat exchanger afterwards. We fitted a new burner gasket as the burner went back in, put the boiler back together and dosed the heating system with inhibitor.
With the boiler running again, our flue gas analyser read O2 3.6%, CO 42 ppm, CO2 9.9% and a CO/CO2 ratio of 0.0004. Our boiler servicing page explains the different levels of service.
A full strip-down service is £185, which includes gaskets and an inhibitor top-up. A basic service is £95 and an intermediate service £125. Details are on our price list.
A service where the burner comes out so the combustion side of the boiler can be cleaned properly, not just inspected. The seals are replaced as it goes back together, and the combustion is checked on an analyser at the end.
The gasket seals the burner to the heat exchanger. Once the burner has been taken off, we fit a new gasket so it seals properly when it goes back in.
Inhibitor is a chemical added to the water in your heating system. It helps protect the boiler and radiators from the corrosion that leads to sludge.
A full strip-down service is £185, which includes gaskets and an inhibitor top-up. A basic service is £95 and an intermediate service £125.
Job attended and photographed by our engineers, November 2026. Written up by Saeed Iqbal, the engineer who leads Synergy Gas & Plumbing (Gas Safe registered 594385). More of our work in the area is on our Great Barr page, and every job we write up is on the case studies index.
From £95
Basic service £95, intermediate £125, full strip-down £185.
No travel charge within 10 miles of B20 2JS. Further out, £2 per mile may apply — always agreed before anything is booked.
What a full strip-down actually involves, photographed as we went: fan and burner out, burner door and heat exchanger cleaned, gaskets replaced. Then a walk round the house to bleed every radiator.
Read the case studyThe analyser was off the top of its scale at the start of the service. A fouled heat exchanger was the cause. Full strip-down, cleaned, and 112 ppm at the end.
Read the case studyThe pressure kept rising even with the boiler off. We found a pinholed plate heat exchanger and replaced it, with the pressure relief valve, from the van. No new boiler needed.
Read the case studyBasic £95, intermediate £125, full strip-down £185. Radiators bled on every visit.
