Since I am too cheap and lazy to replace perfectly good working equipment I would just put in a small hot water heater tank or tankless in the bath room or a hot water circulator on a timer.
Tankless heaters are cool but for $1,000 for a decent gas one to replace a working water heater, I don't know.
If you put a 2psi regulator on the main what happens to all the other 0.4psi stuff you have had all along?
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