Looking for Ravenheat engineers in Wigan? Oldham & Dunn are Ravenheat approved Central Heating engineers in the Wigan area. Services include: boiler servicing boiler repair boiler maintenance boiler replacement boiler flushing Oldham and Dunn is a central heating firm in Wigan. They are Ravenheat Specialists and Corgi approved engineers, soon to become Gas Safe. If [...] Read more »