[Anonymous]

Whilst I understand the concern of having very hot water available at the taps, so long as everyone on board is aware of the danger and capable of using the mixer taps, the hotter the water in the calorifier, the longer it will last before you need to connect to shore power or fire up the engine.
We thought about fitting a mixer valve, but in the end convinced ourselves that the capability to store the hotter water was a benefit worth having.