How does water from a tap/shower get colder?

Question

I know it can get hot from the boiler, so how does it get super cold?

In: 0

Answer 1

The tap is mixing water from the boiler with the water from the main water supply. A lot of mains water sources comes from under ground where the temperature is steady all year round. So you get a steady cold water supply all the way to the tap. The thermostat in the mixer will regulate how much of the water comes from the boiler and how much comes from the cold mains to make sure the temperature is what you set it to.