Yes, although if you have an immersion heater you can turn that on and it'll heat up the top part of the tank pretty quickly. Also the tank doesn't heat up uniformly so you'll get a small amount of reasonably hot water pretty quickly because it'll rise to the top.
Yes, although if you have an immersion heater you can turn that on and it'll heat up the top part of the tank pretty quickly. Also the tank doesn't heat up uniformly so you'll get a small amount of reasonably hot water pretty quickly because it'll rise to the top.