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Originally Posted by SMHarman
On the flip side, if you live in a house with a combi boiler or pressurised hot water system (megaflow or equivilant) then all cold taps in the house are served by main cold water, so safe to drink, and you hot water is instant heat, or in a storage cylinder that is turned over regularly, so unlikly to contain any nasties.
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Ahh, might not be quite so good an idea to drink the preheated "hot" water. It may have been subjected to a heating, cooling and reheating cycle, if the water hasn't been used for a little while, ideal for bacteria growth. Also dependent on the temperature the water is heated to, it might encourage rather than discourage bacteria growth. I think it is accepted water temperatures need to be over 60 deg C to prevent most bacteria like Legionella multilying. That's why you often can't stick your hand under the taps in public buildings, but few home users set their boilers that high.