Shower pump failure

[richardd]

VENTED SYSTEM

I recently looked at a job where the shower pump has failed it is only 8 weeks old.

The pump is located in the attic at the same level as the storage tank. The shower rose is ceiling mounted about 400mm below tank level.

The hot to the pump is feed from the cylinder ( located on floor below ) . The cold is feed TO THE PUMP is from the storage tank ( which is at the same level ).

I have room to raise the tank 300-400 mm will this sort the problem or is there something else going on .

The instructions for the pump states the storage tank should be at least 100 mm above tank.

Is there enought pressure for the hot to rise to the attic to feed the pump ?

PLEASE HELP.

 

[Plumbstar Tom]

sounds like you need to raise the cold water cylinder

is it a negative head pump or positive

 

[richardd]

I am not sure tom. Whats the difference and the theory behind your reply. Thanks

If I go to the center of the eves in the attic I could raise the storage tank maybe 1000mm.

would this help . Its a big job to move the cylinder its in a small cupboard just below the attic at floor level.

 

[richardd]

The pump is pulling hot up from the cylinder then distributing it to the shower mixer valve 400 mm below pump level

 

[WaterTight]

re-locate pump?

 

[richardd]

re-locate pump?

what would be the ideal location for best performance.

It would be easier to raise the tank as it is a large attic ( would this work ) there really isnt anywere below to put the pump except in the cylinder cupboard ( which is tight for space )

 

[WaterTight]

I've never fitted one myself. But next to the cylinder might be a good idea. So you can position it below both hot and cold draw-off's.

 

[richardd]

I've never fitted one myself. But next to the cylinder might be a good idea. So you can position it below both hot and cold draw-off's.

I suppose floor level would be best to get maximum pressure feeding pump.

 

[richardd]

I have just seen the manufactures instruction on google. On the diagram it shows the pump above the cylinder in the attic and the cold storage tank 100 minimum above it.

So I think I will just raise the cold storage tank as high as I can above the pump (as the cold storage and pump r sitting level at the minute ).

 

[Plumbstar Tom]

Whats the pump make and model please?

 

[richardd]

any other ideas doing this in the morning.

 

[richardd]

hudson reed digital mixer pump

 

[helpsy]

I thought the best place is beside the cylinder so the hot water is falling by gravity to the pump rather than having to draw water up against gravity.

 

[richardd]

yeah but the pump is designed to be above the cylinder.

I might fit a surrey flange

 

[Scottley]

When you say its failed is that throgh starvation/aeration?

Where is the hot draw off it it isnt on a surrey flange? Have you taken the first draw off from the cylinder?

what was the flow rate through the pipe work without the pump connected?

 

[richardd]

When you say its failed is that throgh starvation/aeration?

Where is the hot draw off it it isnt on a surrey flange? Have you taken the first draw off from the cylinder?

what was the flow rate through the pipe work without the pump connected?

The previous installer just took a tee of the hot feed from the top of cylinder. the same feed that does the hot for everything in the house. also the cwst is 2.5 mts above cylinder . the cwst is also 700 mm above pump.