I think the main difference between UK and US hot water systems is the pressure. They both involve pre-heating a tank. In the UK it’s common for the hot water tank to be at atmospheric pressure, so the pressure at your hot taps is from the height of the tank above them. In the US, the hot water system is more usually sealed and at mains pressure.
I think the main difference between UK and US hot water systems is the pressure. They both involve pre-heating a tank. In the UK it’s common for the hot water tank to be at atmospheric pressure, so the pressure at your hot taps is from the height of the tank above them. In the US, the hot water system is more usually sealed and at mains pressure.