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size of water pump

what size water pump would you recommendd for a 60' nb driving the usual resources and how does plumbing a second pump into the system work

Asked by: james edge  | 10.27am, Monday 29 February


WW says:

Firstly, if you are expecting to just run a shower or a sink/washbasin, (and not at the same time!) then a pump with a flow rate of around 7 litres per minutes would suffice, though one with 10 litres or more can give more "domestic-like" flow.
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One thing to consider, that greater the flow rate, the more water you tend to use, so a lower flow is probably better for economy (or longer showers!).
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Bear in mind that the pressure is important- ideally with a calorifier, you would want a pump running around 15 to 20psi- to much higher and it can cause issues with pressure relief valve on the calorifier (and higher pressures tend to also lead to earlier failures of the calorifier).
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Twin pumps can be used in parallel, where only one is used at a time (with the other kept in reserve) and a set of isolating valves used to control. An alternative, is a pump which draws from the tank supplying the cold water side, and another drawing from the tank which just feeds the hot water side. One disadvantage of the latter, should a pump fail, say, mid shower, and it was on the cold side, it could mean just hot water is pushed to a shower. The use of twin pumps with one kept in reserse is a good compromise for inland boats, which don't tend to have complex systems.
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In WW was have two more detailed articles- January 2016 "Water System Care" and in January 2013 "getting into hot water" which gives much more detailed information- and can be downloaded from this website.

Mark Langley  | 12.03PM, Monday 29 February


Readers say:

thanks that answers my query perfectly

james edge  | 12.39PM, Monday 29 February

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