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Combi boiler idea that needs feedback...
I'm building out a house that has a couple personalities. It's small at 1200 sq. ft. but has three bedrooms and two full baths. While the house will be my wife and my retirement home, it's in a resorty area with good summer rental opportunities. I have an IBC DC 20-125. I am concerned that the tankless hot water at 3.2 gpm might not keep up with three couples getting ready to go out and maybe some action in the kitchen. Of course the obvious solution is an indirect hot water maker. What I'm thinking though is piping the tankless to all the domestic hot water EXCEPT the two showers and run the showers from the indirect tank. It's my house and I'm doing all the work so I'm not concerned about crunching all the monetary numbers around buying and installing the indirect tank and paying extra for the combi (I already have it). My rational that needs checked is looking at all the hot water that gets used daily that's not showers. You have kitchen use with dinner prep, cleaning and some manual dish washing. You have clothes washing, shaving, bathroom use other than showers like shaving ect. Is the tankless more efficient for these loads than the indirect? In between showers, is the indirect an efficient storage unit? If you all think the tankless is good for these loads one benefit of this scenario is keeping the shower load off the tankless to reduce maintenance due to the rather hard city water (10 grains) we have. I own the combi and would like to use its HW feature rather than simply not piping it for use. Comments please.... Thanks in advance for any help.