[retiredguy123]

Originally Posted by villagetinker

You do realize this will cause the tankless water heater to run much more often. IMHO, if this is a big problem, have another electric tankless water heater installed in the bathroom, figure on at least $1000. I saved a lot of money, I turn on the shower to full hot, count to 30, move the handle back to the normal shower position wait 5 seconds and the shower is ready.

Another thing you can do is to turn on the hot water sink faucet, which will reduce the 30 seconds to about 15 seconds or less.