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I am in Greenpoint. I am a new homeowner and have a question about a heater. I have a two family with tenants in the apartment upstairs. The house is heated by a Weil-McLain Gold CGA. The unit is working, but only seems to be heating the front of the house. The back radiators are cold. I spoke to someone and he said that perhaps I have an air-bubble and need to get the pipes flushed. Does anyone know of a company that does this kind of work? Also, do you find it better to enter into a service contract or handle issues on a case to case basis?