Shower pump

Madrab · 14 Apr 2020

sircerebus666 said:
Why would it be the last place for you?

really noisy (resonates under a bath and into the room below) ..... potentially electrically dangerous, nothing electrical should be in a place (zone 1) where leaks could flood an electrical device, can get sealed in due to tiling making servicing a nightmare, MI's, correct piping can be difficult, etc

I always try to find space somewhere next to the hot water cylinder.

David Sarbutts · 14 Apr 2020

Hi everyone, I just found the pump under the bath and here are the photos.
Any ideas of what to do next?
The pump is a WATERMILL and there power to it. There is also a small black box which is also connected in the loft.
Thanks Dave

sircerebus666 · 14 Apr 2020

That's a twin pump

Did you say your cold water coming out if your shower is the same as normal?

Have you touched the pump to see if it is vibrating when you turn the shower on?

Check the inlet filters to see if the hot water one is blocked

This could also be a problem with your shower rather than the pump

David Sarbutts · 14 Apr 2020

Hi, do you need to disconnect the hose connectors, and where are the filters please?
The cold water as also reduced pressure and there is no vibration at the pump.
Could it be a faulty transformer?

sircerebus666 · 14 Apr 2020

The filter is normally on the inlet connection.

Do you have hard water? You could have scale build up on your shower itself which is restricting the flow

You could remove the shower either by removing the pump outlets from the pipework and turning on the water and pump to see if it kicks in or removing the shower from the pipework , which ever is easiest really.

At least it will tell you what is faulty (check the filters first though)

Do you have a multi meter to test the transformer?

David Sarbutts · 14 Apr 2020

Hi, our very hard and loads of limescale.
I have disconnected both connections on the mixer shower, and still no power from the pump.
I can’t test the transformer. Are there any signs as there is power to it.
What exactly does the transformer do?

sircerebus666 · 14 Apr 2020

I take it you checked the filters?

The transformer downrates the mains voltage to 30.8v as you have a low voltage pump

You need a multimeter to test the transformer to see if the output matches that , without one there's nothing you can do.

The only thing I can think of before replacing the pump is to remove the covers on the two impellors , and see if they spin when you turn on the pump. ( You might find limescale build up especially on the hot water side)

Don't you know anybody with a multi meter you can borrow?

David Sarbutts · 14 Apr 2020

I haven’t checked the filters yet and I don’t know anyone with a multimeter.
I will have a look at the pump in the next few days and check for limescale.
I think it’s by trial and elimination at the moment. I might need a plumber on this one.
I will let you know the outcome.
Thanks Dave

Gasplumber · 15 Apr 2020

Old water mill pump replace it! Honestly somethings are better just replaced!

David Sarbutts · 16 Apr 2020

Hi, I’ve just took the pump apart and both impellers are turning.
Power seems to be OK and still no joy.
I have attached some photos of electrics and pump.
Are the hoses on the pump correct.

David Sarbutts · 16 Apr 2020

Can you please tell me which pump do I need to buy to replace it and does it need to be low voltage?
Thanks Dave

Gasplumber · 16 Apr 2020

Twin impeller salamander. Then it will be a straight swap.
It probably won’t be fitted to mi but it’ll do for a diy job.
You need to make sure that you have power at the supply to the old pump first!
You don’t want a new dead pump

denso13 · 16 Apr 2020

David Sarbutts said:
does it need to be low voltage?

Mains, 230v, is considered low voltage. That'll be ok.

David Sarbutts · 16 Apr 2020

Hi, can you please tell me from the photo, why does one of connections go from one side of the pump to the with a piece of pipe joining them together?
There are only 2 pipe connections.

Madrab · 16 Apr 2020

I presume the transformer and the RCD are in the loft? The one you have just now has a transformer that supplies the pump with ~30V. Whilst 240V is classed as low voltage in general electrical terms, within a domestic setting - 30v is classed as extra low voltage.

Pumps running at extra low voltage were the only pumps that were really designed with use within zone1 of a bathroom, as the power was at a voltage that would be less liable to kill someone if it or the supply cabling got wet. 230/240V in a bathroom is a big no no in my book unless all the cabling connections are outside the bathroom and the appliance is at least IP65 (IPX4) rated.

You can still get extra low voltage watermill pumps though - Grundfos make them - If not then you'll need to run a new 240V supply down to the new pump you buy, if it's going under the bath.

edited for some shocking grammer

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