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I own a two family house with a separate gas boiler for each unit. Both units have a one-pipe steam heating system. One boiler is about five years old and the other about 10 years old.
Some basic questions.
How often should a gas boiler be cleaned?
What should a normal cleaning consist of?
How long should a cleaning take for one boiler?
What is a typical cost for a cleaning? I am in New England.