You may want to look at the economics of the instant hot water system, I am assuming that you are looking at the pump/valve option. There was an earlier thread on this and I agree with the conclusion this has a potentially significant monthly cost. Otherwise, Lowes and Home depot have a very good selection of plumbing components, might also consider Ace.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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