Unvented cylinder take off

[billyfergy]

Typing mistake this is a Vented System. On a visit to my mates house over the holidays, he asked about a intermittent problem with there power shower, he thinks the connection was made by the council plumbers some years ago. my questions is two fold, firstly i was always of the belief that no solder fittings should be used within the first 1m from exiting the top of the cylinder, it has a solder elbow instead of a formed bend and then half way along the level run to the vent and feed pipe there is a solder t inserted which is part of my other query this is where the takeoff for the shower has been inserted which after 4 inches then is run in 15mm poly using a poly plumb straight connector, the cylinder is fed by 22mm and the pump is drawing in 15mm. but if the shower is used twice when it starts for a short while there seems to be very limited hot water, its my thoughts that its causing a bit of an air lock in the cylinder.
any input would be appreciated.

Thanks
Billy

 

[Dotty]

Vent pipe on a uvc?

Think I've spotted the problem here....

 

[Dotty]

And a pump?

You sure it's unvented?

 

[kay-jay]

And a pump?

You sure it's unvented?

Im sure it isnt.[emoji87]

 

[townfanjon]

Could be a pre-plumb , i think we need some pics .

 

[billyfergy]

Hi Guys
was typing this after talking with him about upgrading to unvented and still bleary eyed, it is of course a vented system.
DOH

 

[billyfergy]

Could be a pre-plumb , i think we need some pics .

Will get a pic later couldnt get access last night.

 

[GasmanxxxR1]

soldered fittings are fine. the tee is not the best but they do work. many pumps have maximum run times in a n hour. better to leave longer between showers