Domestic Hot Water Heating Options
I’m looking for some advice on the most efficient, cost effective way to heat DHW for my project currently being built. The project is in zone 6 and includes two residences, a main residence and an “in-law” apartment separated by an attached garage. Both homes will be spaced heated by the same pellet boiler located in the basement of the main residence. I’m thinking that an indirect fired hot water heater might be the most efficient atleast for the main residence but I’m not sure about the feasibility of doing this for the in-law apartment. Also, I’m concerned about having such poor efficiency heating water with a furnace in the summer time, albeit our heating season is 7-8 months a year so maybe this isn’t as big of a concern.
Is it worth having two heaters for the primary residence: an indirect fired for the winter and switch over to an electric or heat pump heater in the summer months? Or is the upfront cost of two heaters not worth the gain in efficiency? Are their concerns with heating the inlaw apartment with an indirect hot water heater as well? Otherwise I’ll likely purchase a heat pump water heater for the inlaw residence. By the way, the in-law apartment will also have a basement to locate the water heater.
Thanks in advance for your advice!
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