I'm looking to replace my boiler and hot water heater.
For background, I live near Boston, my home is about 2000 square feet, we have gas for heat, stove, and dryer, and we are two people in the house.
It seems that there are three basic options:
For a novice, the first option seems to be the most efficient option, but one plumber strongly advocated for the third option.
His reason is that the boiler is expensive and it is only really needed for 5 months of the year. A combined unit requires the boiler to be used all year and thus puts unnecessary wear on it.
What else should I consider in selecting between these three options? It is an expensive job so I want to make sure I do it right.