Does central heating use mains water?

The water that is heated by the boiler is in a closed loop, and is heated, cooled and circulated continually. The water that comes from your hot taps will be either direct from your mains, from a cylinder or from a loft tank. You will only cut off the supply of water to the tanks, cylinders and taps.

How does the water in your central heating travel around the pipes?

Radiators are normally connected to a central heating system via pipes and hot water flows through these pipes and into the radiators themselves transferring hot water into the radiator. As mentioned, this hot water heats the room via convection.

Why does my central heating come on with hot water?

If your central heating comes on with the hot water The valve is not sealing off the central heating port correctly. Hot water flows through your radiators when it should flow through the cylinder coil instead.

Why does my central heating make a noise when I open the tap?

The noise is caused by a sudden change in direction to the flow of water. When you open a tap, the water flows to it, and when you close the tap, the water should stop.

Why does the boiler come on when the hot water is on?

The valve itself is actually opening hence the heating system is getting hot when the hot water is on but the boiler is only fired up when the hot water motorised valve is open, the boiler should fire up if either valve is open.

What should I do before draining my central heating system?

Before starting the process of draining central heating system and your wondering what to do. Firstly make sure that the water supply to the central heating system is in the off position. This can either be turned of at the mains water stopcock, the isolation to the central heating tank or the gate valve after the central heating tank.

Before draining the central heating system, stop the water supply to your unit, which will prevent the water from entering it while you work. There should be a separate stop tap for that, however, if there isn’t one or you find it hard to turn it, simply stop the water flow by tying up the ball valve to a wood laid on top of the cistern.

Why does my radiator heat up when I Turn on the hot water?

A frequent and likely cause is a faulty or jammed three port valve. In a typical central heating and hot water boiler system, the valve sends water to either the radiators, the hot water cylinder, or both. It could also be that the valve is ok but the control wiring between the valve and its commands (switches / thermostats)…