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Steam gas Boiler efficient
I am a relatively new home owner and not very technical so please sorry if the question is stupid.
My furnace steam boiler is gone. I need to replace it. I was reading about it, and it says about new equipments with 95% efficient. Does this apply to steam gas boiler as well? Can we have have a two stage steam gas boiler? For cold weather, should we choose Condensing or non-Condensing gas boiler?