Reason for usual HW shutoff valve location

19 Jun 2019
Reaction score
United Kingdom
In a conventional system, the standard arrangement is to have a gate valve on the (typically 28mm) cold feed pipe from cistern to cylinder.
Out of curiosity, I was wondering why you won't find it on the hw pipe (typically 22mm) going out of the cylinder instead.
Of course, positioned after the vent tee.

Since the valve would have a smaller diameter, it would be cheaper.

So why? Maybe because it would need to withstand possibly higher temperatures?

It's just an academic question, but I'm curious :)


  • upload_2020-10-23_15-0-17.gif
    42 bytes · Views: 166
Last edited:
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links