Aeration in hot supply to pumped shower

[rovermorris999]

I'm getting temperature fluctuations and aeration on the hot side of a pumped shower which is installed in the loft.
I've done some research (thanks google) and I think the plumber hasn't fitted an anti-aeration flange, merely teed off the hot flow but it is the first call. Will a surrey flange do the trick or will an essex be required? I'm hoping a surrey will do the trick as I don't fancy him cutting holes in the cylinder.
If it does need an essex, could I move the pump down to the airing cupboard next to the cylinder and use a surrey?
Bloody plumbers! Present company excepted of course!
Any guidance gratefully received.

[iiyama]

Surrey flange and essex flanges essentially do the same thing, just differnt to fit.

What sort of pump is it? And is it installed in the loft? Not to sure from your discription! Basically is the pump above the cylinder and less then 600mm below the storage tank? If so then it should be a negative head pump.

Ill PM my phone number and you can gis a call tomorrow if you like?

Ian

[rovermorris999]

Thanks for the offer Ian. The pump is in the loft, just enough head I think as the tank is raised. I've talked it over with the guy who fitted it and decided to move the pump down to the airing cupboard so hopefully that'll do it. I presume he can just tee off the normal outlet in that case or will a surrey be needed? There are two showers, the other seems to be working but we'll move that too just in case. Can they both be teed to the top outlet of the cylinder?

[dirkgently]

As the shower pump starts it lowers the water pressure in the cylinder slightly this causes the water to release dissolved air in the form of bubbles,the Essex or surrey flange allows the bubbles to travel up the open vent whilst unaireated water is sucked into the pump.