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Repair / replace heating system - Central Heating job in Crofton Park, South London

Repair / Replace Heating System

Job Description

Three years ago we had a new "mega-flow" heating system installed. It was not done properly unfortunately and we've had numerous problems since then.
The company that installed it have gone bust.
We've had heating engineers out to look at it as well as the manufacturer of the Boiler [it's out of warranty]. None have filled us with confidence that they know the problem, all have charged us large amounts for not very much and we're no further down the road to solving the problem.
I need someone I can trust who will tell me the best thing to do and get on with it.
Should we rip out the existing system and start again, or can it be repaired?