There is no greater lottery in life than turning on a shower you are unfamiliar with.
@garius Someday someone will invent a shower with a thermostatically-controlled mixer that ALSO has a thermostatic dump valve so that when you turn it on the water flow is diverted down the drain until it comes up to the target temperature.
@cstross @garius
Showers that are combined with a tap even already have a valve fit for the purpose.
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