The right-hand manifold inside the boiler was leaking. Rather than book a return visit, we found the part locally, fetched it and fitted it before the day was out.
A Worcester Greenstar 28i Junior in Solihull was leaking from inside the case. We traced it to the right-hand hydraulic manifold, the plastic block that carries water between the pump, the heat exchanger and the pipework. It had corroded and was weeping at the joints. A manifold is not a part we carry, but rather than book a second visit we found one at a local supplier the same day, collected it, fitted it and tested the boiler back into service. The customer was extremely happy with the service.
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£99 in office hours (Mon–Fri, 8am–5.30pm) covers attendance, diagnosis and the first hour. Parts and any further work are quoted and agreed before we carry on. Out of hours, the price is quoted by phone before we set off.
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
Smell gas now? Do not use this form or wait for a reply. Call the National Gas Emergency Service free on 0800 111 999 (24 hours). If you are using a mobile, make the call from outside. Open doors and windows, do not switch electrics on or off, do not smoke or use naked flames, and turn the gas off at the meter if it is safe to do so, unless the meter is in a cellar or basement. Once the supply has been made safe, we can trace and repair the fault.
The customer in Solihull had a Worcester Greenstar 28i Junior that was leaking from inside the case. A boiler leaking internally is one to act on quickly: the water finds its way onto the electrics and the control board, and a small leak turns into a big bill.
With the case off we traced the leak to the right-hand hydraulic manifold. On this boiler the manifolds are the plastic blocks at the bottom that carry water between the pump, the plate heat exchanger and the pipework, and they hold the sensors and valves that the boiler relies on. This one had corroded and scaled up at its joints and was weeping. You can see the state of it in the photos above. A manifold in that condition cannot be resealed; it needs replacing.
A manifold is specific to the boiler and not something we carry on the van. The usual route is to order it and come back, which means a second visit and a customer with a leaking boiler in the meantime. Instead we rang round, found the right manifold at a local supplier that afternoon, went and collected it, and came back to fit it. The old manifold came out, the new one went in, the pump and pipework were reconnected, and the boiler was refilled, run and checked dry at every joint before we left.
Diagnosed, sourced, collected and fitted in a day. The customer was extremely happy with the service, and that is the outcome we want on every repair where the part is within reach.
Most of what fails on a boiler is on the van. When it is not, the difference between a good repair and a frustrating one is often whether the engineer is willing to go and get the part. Where a supplier within reach has it in stock, we will collect it the same day rather than leave you waiting on a delivery. It is a big part of why, of the 505 repair jobs with attendance records between October 2023 and August 2026, 447 (88%) were finished on the first visit (how we counted), and it is why we ask you for the make and model when you book, so we can check parts availability before we set off.
In office hours a boiler repair callout is £99, covering attendance, diagnosis and the first hour. Parts are quoted before we fetch or fit them, and a same-day parts run is part of the service rather than a premium. Full details are on our boiler repair page, and if your boiler is losing pressure without an obvious leak, read our boiler checklist first: an internal leak like this one is a common cause.
This is one of several Worcester repairs we have written up. Our Worcester boiler repair page covers the faults we see most on Greenstar boilers, with every job photographed.
The hydraulic manifolds are the plastic blocks at the bottom of the boiler that route water between the pump, the plate heat exchanger and the flow and return. They carry the diverter valve, sensors and the pressure relief valve. When one corrodes or cracks it leaks inside the case, and because it holds so many other parts it is replaced as a block rather than patched.
Often, yes. For the common makes there are trade suppliers across Birmingham and the Black Country, and if one has the part in stock we will collect it that day rather than order it and come back. Tell us the make and model when you book and we will check before we arrive. Where a part has to come from the manufacturer, we say so up front.
It is urgent. Water inside a boiler runs onto the fan, the gas valve and the control board, and a leak that would have been a cheap part can take the electronics with it. If you see water under or inside the boiler, or the pressure keeps dropping, turn it off and call us the same day.
Yes, the whole borough: Shirley, Olton, the town centre, Knowle, Dorridge and Monkspath, from our Handsworth Wood base. No heating and no hot water calls are prioritised, and a leaking boiler is treated the same way. Call and we will tell you the earliest time we can attend.
Job attended and photographed by our engineers in Solihull, April 2026. Written up by Saeed Iqbal, the engineer who leads Synergy Gas & Plumbing (Gas Safe registered 594385). More recent jobs in the area are on our Solihull page, and every job we write up is on the case studies index.
£99 diagnosis + first hour
£99 in office hours (Mon–Fri, 8am–5.30pm) covers attendance, diagnosis and the first hour. Parts and any further work are quoted and agreed before we carry on. Out of hours, the price is quoted by phone before we set off.
No travel charge within 10 miles of B20 2JS. Further out, £2 per mile may apply — always agreed before anything is booked.
Heat exchanger stripped and cleaned on a Viessmann that is showing its age, then the Tempest cylinder serviced on the same visit. Customer given a straight view on when to start planning a replacement boiler.
Read the case studyA London landlord booked online for a tenant with no hot water from an Intatec Hiper HIU. The pressure independent control valve was sticking and the strainer behind it was seized and packed with dirt. Freed, stripped, cleaned and refitted; a new valve booked for a return visit.
Read the case studyThe main heat exchanger had failed on a boiler that had done 17 years, so the numbers pointed one way. Like-for-like swap into the same cupboard, Worcester magnetic filter fitted, system dosed, guarantee registered.
Read the case study£99 in office hours covers attendance, diagnosis and the first hour. Parts quoted before we fetch them.
