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Oil boiler with gas conversion burner
Good morning to all. Looking to install my first new steam gas boiler using an oil boiler with a conversion gas burner. What are the estimated efficiencies comparing a standard atmospheric gas boiler to a standard oil boiler with gas burner to a triple pass oil boiler with gas burner? There is a substantial difference in price between the triple pass boilers and the standard oil boilers. I want to be able to give my customer all the options. Thank you.