shower pumps


Postby jlbpasty » Fri Jul 18, 2008 11:26 am

am considering installing twin feed shower pump, found no technical information in manufacturers sales info concerning cold supply. does supply need to be from roof tank or can it come directly from mains.
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Postby plumbbob » Fri Jul 18, 2008 8:14 pm

Shower booster pumps cannot be connected directly to the mains supply. The idea is to increase the pressure from low level header tanks where there is a stored quantity of water.

If a pump is installed directly to the rising main, to improve the flow, the pump will need to suck water from the incoming supply which will put your underground main at a negative pressure. If this supply pipe is perforated at any point along it's length, ground water would be sucked into the supply consequently contaminating the drinking water.
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Postby jlbpasty » Sun Jul 20, 2008 9:20 am

[quote="plumbbob"]Shower booster pumps cannot be connected directly to the mains supply. The idea is to increase the pressure from low level header tanks where there is a stored quantity of water.

If a pump is installed directly to the rising main, to improve the flow, the pump will need to suck water from the incoming supply which will put your underground main at a negative pressure. If this supply pipe is perforated at any point along it's length, ground water would be sucked into the supply consequently contaminating the drinking water.[/quote]

Thanks "plumbob " I was intending to improve hot water flow to shower by installing a booster pump near hot water storage tank and was undecided whether to fit a twin hot/cold feed pump or just boost the hot supply with single feed pump. From your advice I feel a twin hot/cold pump from both cold attic storage & hot cistern would be the best course. the cost is no problem. thanks again.
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