pump for pressurised system

L driver

Hello,
Can anyone offer experience or opinion on variable speed water pumps for domestic use? As in having a tank/reservoir in the garage and a pump pressurising the water in the house. Thanks.

fclauson

L driver wrote: »

Hello,
Can anyone offer experience or opinion on variable speed water pumps for domestic use? As in having a tank/reservoir in the garage and a pump pressurising the water in the house. Thanks.

I am doing this - think it will be a 700L tank in the garage

So the feed will be
well pump to pressure vessel via grit/muck filter
pressure vessel to kitchen (for untreated drinking water)
pressure vessel to treatment (if needed) to 700L tank
700L tank via variable speed boost pump to both hot and cold feeds to house (other than kitchen)

The expensive bit is the variable speed pump

L driver

What sort of power will your variable speed pump use? Are you looking at 1k mark for the pump and is it worth it?.Off topic a bit...is 700l alot of water to store? Would it become stagnant?

fclauson

Spec is

900 litre uninsulated black water tank, technopress 25.4 variable speed boost pump HIGH FLOW 4.5bar 110L min, pipe

Stagnent- no the tank is always being changed - the tank works much like a cold tank in the loft - except there is a pump on the exit to boost pressure to the house

the therory works that the tank holds 900 L - you start showering etc and the pressure pump starts and starts to drain the tank - your well pump cuts in and starts filling the tank - in therory there is enough buffer in the tank that it will never run dry - the well pump might not be able to keep up with the emptying pressure pump but it will not be far off

worth it - not sure - but I think so

hope that helps

tred

fclauson wrote: »

Spec is

900 litre uninsulated black water tank, technopress 25.4 variable speed boost pump HIGH FLOW 4.5bar 110L min, pipe

Stagnent- no the tank is always being changed - the tank works much like a cold tank in the loft - except there is a pump on the exit to boost pressure to the house

the therory works that the tank holds 900 L - you start showering etc and the pressure pump starts and starts to drain the tank - your well pump cuts in and starts filling the tank - in therory there is enough buffer in the tank that it will never run dry - the well pump might not be able to keep up with the emptying pressure pump but it will not be far off

worth it - not sure - but I think so

hope that helps

I have a tall cylinderical blue uninsulaated tank in the garage,(takes up less space) with pump built in. Ill get the specs today. It works very well so far anyway. And its so quiet. its about 1k litres.

L driver

Came across wilo pumps in my search, anyone know anything about them? No connection to the company.

fclauson

L driver wrote: »

Came across wilo pumps in my search, anyone know anything about them? No connection to the company.

that is the product I will be using

TPM

Why not drop the next size up submersible pump (eg a 1hp instead of a 3/4hp) in the well, fit a 300l+ expansion vessel set the pressure high on the pressure switch and pressurise the whole house from that

fclauson

I beleive the issue is this - if you are drawing off more water than your well can provide then the sub pump runs dry and burns out so the need for a buffer tank

Its not that the well cannot provide the volume over a period - its that it cannot provide the volume at the instant of demand

L driver

fclauson,
did you do any figures regarding cost of pump and energy saved with the variable speed? What sort of wattage range will the pump work within?

fclauson

L driver wrote: »

fclauson,
did you do any figures regarding cost of pump and energy saved with the variable speed? What sort of wattage range will the pump work within?

Nope - unusally this was not done my with my ususal spreadsheet approch - it was "it looks about right lets do it "