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I've been extensively researching gas tankless heaters because I'm about to buy one as part of a major remodel of my home. I haven't found very good cost information aimed at the involved homeowner, so I thought I'd start a thread. There are plenty of threads on pro installer sites on costs...

I'm planning to install a Rinnai gas TWH. This is a whole house unit, new construction, PEX piping. I will have a hot water return line, and I want to add a recirc pump with a small storage tank to eliminate delivery wait time. Basically, I'm making my own hybrid heater. Can anybody suggest...