Shower pump spec

11 Jul 2011
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United Kingdom
I have:

25 Gallon Cold Water Storage Tank
25 Gallon Hot Water Cylinder
6" Negative Head

Salamander ESP 75 CPV Shower pump:
Type – 2.2 bar twin-ended two stage centrifugal
Maximum Pressure – 2.2 bar
Duty point 1 – 2.1 bar at 10 litres/min
Duty point 2 – 1.95 bar at 20 litres/min

How much flow will I get and will I need to restrict the output from the pump to the shower to increase pressure drop and decrease flow.

What are the best valves for doing this>The flexi-hose have valves in, I assume these aren't suitable?
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It depends entirely on how restrictive your shower valve and shower head are. Your shower manufacturer may have some technical info on pressure vs. flow, and may come with flow reducers that you can select.
Your cold water tank is too small, it needs to be a 50 gallon minimum. Or ideally 2 x 50 gallon tanks.

You will run out of water very quickly.

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I need a pump because I have negative pressure.

I have fitted the largest tank I can in the space.

I am curious how I can throttle the supply to the shower to create a larger pressure drop.

The shower I am fitting is rated at 12LPM@2 BAR

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