Ok - so still have to do it the hard way.
Heres a money spinner .... some sort of gravel syphoner (bit like a pool skimmer) that runs around all by itself (on a timer of course), measures how much water it took out, then triggers a refiller that measures out water and ager and heats the water to desired temperature on the way thru, replacing the water taken. Ooooh you could even dial-up for meds if you need them! ... Then switches itself off til next time.
Bet you all would buy one of those hey! :lol: :lol: :lol:
Did you know you can heat your shower water like that now. Heats only the desired amount (as you use it). They are supposed to be pretty good too.