Is this vented or unvented water cylinder?

grumbler

Avalanche123 said:

I thought this can't be an unvented one. They normally have an expansion tank, right?

No, they are sealed and under mains pressure. They have an expansion vessel with compressed air.

grumbler

Avalanche123 said:

Any tips on how to find which taps are mains?

Mains valve is for the loft tank only. It can be near the tank or in some other place.
https://www.plumberparts.co.uk/advice/hot-water-tanks/open-vented-hot-water-cylinders

Avalanche123

grumbler said:

Avalanche123 said:

Any tips on how to find which taps are mains?

Mains valve is for the loft tank only. It can be near the tank or in some other place.
https://www.plumberparts.co.uk/advice/hot-water-tanks/open-vented-hot-water-cylinders

Sorry, I phrased the question badly. What I mean is, how do I find out which taps are fed directly by the mains supply? The previous owner said that all cold water is from mains but I am a bit sceptical.

Thank you

nofoollikeold

1. Find the main stop valve for the property.
2. Turn it off.
3. Open each cold tap in turn.  Allow any residual water to flush out (10 seconds).  If water continues to flow at a decent pace, then tank fed, otherwise mains.
4. Repeat for WC's to see if mains or tank fed.
5. Turn water back on.

grumbler

Typically, mains water is in the kitchen, supplies the big tank in the loft, small expansion tank for heating and an electric shower if you have it.

EssexExile

Usually mains is stopped by a stopcock, non-mains pressure is stopped by a gate valve. Google those terms to see the difference.