boosting hot water pressure from a cylinder?

[johndenim]

Hi Guys, brand new here, I need help please!

Okay. I have a cylinder in my bedroom, which is on the same level as the bathroom.
The hot water pressure is really bad, so I installed a single impeller booster pump ( with built in pressure switch ) to the outlet of the cylinder.
All it does is feed the hot water back into the tank above via the expansion pipe. Rather than boost the hot water pressure/flow. Should I have fit it to the cold inlet instead? Any help gratefully received! Thank you.

 

[dcawkwell]

Should be on the outlet (top pipe) of the cylinder but after the vent pipe.
The vent pipe should be on the suction side of the pump.

 

[seco services]

Take it you fitted the pump on the horizontal pipe before the vent pipe ?

 

[johndenim]

Wow quick response thanks guys!.

Well, they are both joined on a T, one going to hot water services, one going back into the cold header tank. As mentioned, when the pump runs it just pumps water back into the tank.

Oh I see now, sorry. I came straight out of the tank, through pump them back to T that feeds both pipes.

 

[seco services]

Pump should be after the vent as said.
I always prefer a pump seperate to the vent ie on a essex, surrey flange.

 

[johndenim]

I see what you mean, I suppose I put it there because it was easier to access.

I have seen conflicting threads on other forums, which say put it on the cold inlet. Would this still work or not? Thanks once again.

EDIT. I did not use an essex...surrey flange. lol

 

[seco services]

You put it on the inlet you'll pump it straight up the vent.

This will give you an idea.
FLANGES

 

[johndenim]

Ohh. I really appreciate your help thank you!

Why is that vent there in the first place? I am an electrician...

 

[seco services]

Hot water in the cylinder expands when heated it needs to vent.

 

[dcawkwell]

Ohh. I really appreciate your help thank you!

Why is that vent there in the first place? I am an electrician...

Paranoia again.
No real need for it. Any expansion of hot water would go straight up the feed pipe. If the vent pipe wasn't there.

If you cap the vent pipe it will work perfect.
Just don't say I told you to do it. I am sure I will will be struck down by
people quoting regulations. I suppose there is the chance of collapsing
the cylinder if the feed pipe became blocked with a pump after the cylinder
but slim.

 

[johndenim]

I thought " can I just cap it " but then I thought 'regs'.

I wouldn't want to come home from a two week break to find a swimming pool in my living room!
I'll do it right today, and post pics.