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If they can put a thermostat in cars and crock-pots, why not a shower? Automatically adjust hot/cold ratio to maintain a constant water temperature. Could even be powered by water flow through a small turbine, like those intelligent toilets.
Grohe: Grohtemp Thermostatic Temperature Control Valve
I actually used an earlier version of this product in Japan in the early 80s. It worked wonderfully [jplummer, Apr 06 2000]
||'Anti-scald valves'. Standard code at least in Florida...work by balancing the pressure of the hot and cold water; if the cold pressure suddenly lowers, the hot pressure goes down to compensate.
||A while back when I was younger, there was a Heathkit kit for a nice digital shower thermostat. Had a little digital display and two big waterproof buttons. Was pretty neat looking but very expensive.
||I've seen ones with digital displays and buttons, to set specific temperatures, but they were expensive too...