Thermostatic shower bump start


Postby forreq » Sun Jul 08, 2007 9:34 am

Hi,
I have two thermostatic showers (different rooms) in a system arrangement.
Both showers have more than 1 metre of head pressure.
One shower has a pump and the other is gravity fed.
The problem is that both showers need to be turned to their lowest setting to start the flow.
Sometimes this is not enough and require a 'bump start' by allowing water flow from the basin hot tap.
Does anyone know if this is usual or whether something's away?
forreq
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Joined: Sat Jul 07, 2007 8:12 pm

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Postby plumbers1 » Fri Jul 20, 2007 10:11 pm

The length of the supply pipe is to long for the pressure to drop enough for the pump to start. You need a negative head pump.
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Joined: Sun Jun 24, 2007 7:33 pm


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