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I've never heard of a "drainwater heat exchanger" - interesting idea, but not doable in my already-renovated-single-story slab foundation home! Too bad I didn't learn of these two years ago in the planning stage. I'll store the idea for later, although I swore I'd never renovate again. Thank you...

Hello. I have 2 Noritz tankless natural gas water heaters, each with its own H2Flow filter. I know the manual says to change the H2Flow filter every 2 years, but I don't want to change the filters earlier than is really necessary. Is there some way to tell when the filter needs to be changed or...