I'm interested in replacing my tank water heater with a Bosch AquaStar. It would serve a home with 2 baths, and an in-law unit with bath and kitchen.

The smaller model ($500) says it provides hot water for "one major application" at a time. The larger model (close to $1000) provides for two and a half.

I'd welcome hearing opinions about this heater and about sizing.

Thanks!