Originally Posted by bedrck46
The only negative I see with using the bypass is if you need to make a adjustment to the bypass while your standing soaking wet in the shower.
Otherwise an excellent suggestion
Or would just closing down the Hot Valve at the WH to restrict the flow a little bit serve the same purpose
You can't adjust the bypass valve easily. Mine is under the bed, behind an access panel.
But, it can be set to mix some cold water to prevent scalding.
From a theory standpoint opening the bypass valve fully will give you a 50/50 mix of water from the heater and unheated water. It'll take quite a few gallons of wasted water to get the temperature delivered to the nearest faucet 'Just right'.
I'm going to shoot for nearest faucet (bathroom sink) to "I can keep my fingers in it, but wouldn't want to". That should give me good dishwashing temp at the kitchen sink (farthest faucet).
You'll have to mix a bit of cold water in anyway to get a comfy shower. Especially when the WH is at its hottest (just as it turns off the heat source).