Question...If you are at a hotel and the lights go out, is there anyway you can still use the water to take a shower? If they have a generator, does that include toilets and stuff?
Many gas-powered boilers use electric thermostats and so don't work terribly reliably once power is down.
Some bigger houses and hotels use electric pumps to fill water tanks in their attic spaces to provide water to their various rooms through gravity-fed systems.
Many showers require electricity to work--power showers, as mentioned above.
Bathrooms without windows would be dark if there were no power.
If there's a full hot water tank but no power to drive a water pump required by the system, you'll have hot water but the cold might run out before the hot water, so your character could get boiled.
There are all sorts of things that could go wrong, and all sorts of ways to make this work how you want it to.
Real question... What do you need for your story? If you need it to go out, put the hotel on a well with an electric pump. If not, gas or oil fired hot water heater and let the good times roll.Question...If you are at a hotel and the lights go out, is there anyway you can still use the water to take a shower? If they have a generator, does that include toilets and stuff?