The house has one bath and generally only 1 DHW use at a time.
I have two 11 year Takagi TK-Jr on demand water heaters, one for heat and one for DHW.
Just mapping out a plan to replace them if they fail. Is there a better choice going forward? They hang on the wall in a closet (direct vent intake and exhaust) and take up very little room. We have a Triangle Prestige combined at our own house which has far too much capacity for this application.