Air getting in to Surrey Flange take-off for shower?

Makhaira

Makhaira

Makhaira

Soldato
Joined
23 Nov 2007
Posts
4,994
Location
Lancashire, UK
Just wanted to get some opinions on here on my diagnosis of my shower issues.

I've had a 1.5bar shower installed that's mavity fed from a dedicated cold and hot feed, with the hot feed coming off a Surrey Flange on the top of my tank. If I've not had a shower for a while (i.e. morning to morning, or evening to morning), then after a few seconds of running, I'll get an airlock in the pump. I usually then switch it off for a few seconds, switch back on, and the airlock clears through, no problem.

If someone then showers after me, there is no repeat issue, and the pump runs absolutely smoothly.

I'm therefore presuming I have a slow air ingress in the system which is build up to an airlock over time, and then being pushed down into the pump. There is no external water leakage.

Currently the installation is done with speedfit off the Surrey Flange, and I'm wondering whether asking someone to redo it with copper pipe coming off a 450mm+ takeoff on the side of the tank instead will solve this issue?

Cheers!
 
Is the cold feed from a water tank in loft or direct feed off the mains.

Might be pump drawing in air, were it hasn't been used for a few days, any water present evaporates.

And how old is the cylinder.
 
Check the ball c ock in the water tank in the loft, might be sticking every so often,usually plunger, allowing the water to drop a bit low & letting in air in to the system.
 
Unlikely to be the ball c0ck based on the op, as the problem clears and does not repeat until left.

Are you 100% sure the cold feed to the pump is dedicated and independently run from the cold tank, rather than teed off another supply?

I normally trust surrey flanges but it would be good to get a photo of the arrangement, again in case they've done something silly like connected it to a vent pipe.
 
Last edited:
Haha, sorry about that.

The Surrey was fitted incorrectly back then, so he corrected the arrangement (he'd taken the shower off the vertical connection). The cold is a dedicated large pipe up to the loft tank (22mm?25mm?).

The Surrey horizontal goes to the pump, the vertical goes to a vertical piece of pipework which I am assuming is a vent at the top, and then downwards provides hot water to the kitchen? (educated guess there).
 
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