Low hot water presure from my power shower pump. Help

[geocraig]

Hi
I have just fitted a watermill Wasp 50 power shower pump. The cold water is working well but the hot water starts ok and the quickly fades. The cold water tank is about two meters above the pump the top of the hot water tank is about 1 meter above the pump. The hot water tank holds 96 ltrs. The supply to the cold water tank is well fed and not mains. Can anyone suggest a way that I can sort this problem out.
Many thanks

George

 

[seco services]

airlock between the cylinder and pump.
how is the hot connected to the cylinder?

 

[geocraig]

The hot water comes straight out of the top of the hot water tank

 

[seco services]

what on a surrey flange?

 

[geocraig]

Sorry I dont know I dont think so because there is no "t" piece on it

 

[spacethegas]

as i understand it Watermill recommend the use of a surry or york flange.

what do your installation instructions say ?

 

[seco services]

can you not give us a pic ?
i would say you have a airlock their.
can you isolate the cylinder and remove the hot pipe to pump and run it into a bucket etc to clear any air then connect back to pump when running ok.

 

[geocraig]

The fitting instructions don't say anything about a flange. I have reconeted the hot pipes by passing the pump and it runs ok without air locks but if I then try to introduce the cold water it it just turns cold. The reason I fitted the pump is that I have very poor water pressure from my well. The local diy store stocks a worex flange would this do. Also if I fit a worex or sulffolk flange what do I do with the "t" piece? the tank is in the airng cupboard and the hot water pipe goes through a granite wall.

 

[seco services]

is the cold through the pump as well?
if your getting hot water to the pump as you say its ok when you by-pass is the pump kicking in ?
as the cold side maybe and the hot not kicking in.

 

[geocraig]

Yes the cold is through the pump too.
The pump is cutting in with the hot but it seems to run too fast for the supply. It starts of fine and then ends up a trickle.

 

[seco services]

does the hot t off the horizontal pipe out of the cylinder

 

[geocraig]

no it just bends slightly to the lef and then elbows and goes through the wall.