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Author Topic: Rainwater harvesting pump burnt out.  (Read 5409 times)
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« Reply #15 on: March 22, 2014, 11:33:41 AM »

I like domestic water at 2.5 bar. Under 2 and you really notice lower flow and above 3 the pump will stay on for ages to reach that last little bit of pressure. I normally run a pump at 2.5-3 bar with an oversized pressure vessel (as the hysterisis is lower than normal to stop excessive hunting) and the PRV it down to 2-2.5bar so that showers don't change temp when someone opens a tap.

I too have fitted a Pressure Reducing Valve on the output of the pump today. I have a 12KW Instantaneous water heater and found the temperature of the shower would fluctuate as the pump starts & stops. The pressure vessel is charging to between 2 & 3 bar and the PRV is set at 1.5 bar, which is more than enough and the shower maintains a constant temperature now.

North Somerset. 3.92KWp SE facing PV system.

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