is my vent pipe in the wrong place (cold water feed)

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Warwickshire
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United Kingdom
The hot water cylinder does not have a vent pipe coming from it's supply. So basically the hot water feed goes straight to the taps. However the cistern that supplies the hot water cylinder does have a vent pipe teeing off from it's supply to the hot water cylinder. I have never seen this before and was wondering if anyone knows if this is an acceptable position for the vent pipe or should I change it immediately????
 
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Sorry but I'm not clear what you mean.

There is a pipe which goes out from the big cw cistern, into the hw cylinder, at the bottom. Do you mean there's a "vent" pipe teed into that which is taken up and over the cistern?
If so it's wrong; it won't let steam, in the event of an immersion heater's thermostat failure, or bubbles, in normal operation, escape from the cylinder.

Move it to the standard position!
 
the cistern that supplies the hot water cylinder does have a vent pipe teeing off from it's supply to the hot water cylinder
Are you sure that this cistern is not the Feed and Expansion tank for the heating system? It would be common to find a combined feed and vent pipe on those, but certainly not on the cold feed to a hot water cylinder.
 

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