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thank you for the reply. i dont think it is the effeciency i was concerned about. my concern is that i might be trading a functional boiler which admittedly is not effecient-but functions well for the house- for one which could potentially bankrupt me in repair and replacement costs. here is...

I have an old arcoliner. gas fired tankless boiler and water heater. it was originally oil fired and i was told maybe coal before that. it has been well maintained, has a new burner, and low water cutoff. The aquastat needs replacing but isnt affecting anything the way it is now. I...