I am in the process of building my rain water harvesting systen.
So far I have all the outside taps, all three toilets and the washing machine all plumbed on seperate white plastic pipework going to the old cold water tank in the loft. This cold water tank can hold 250 litres. (all my other pipework is in copper to avoid confusion)
(the cold water tank was repurposed for rain water as there is now a combi boiler so rendering the immersion tank and cold water tank superfluous... so I decided to re-use the cold water tank for being able to store an extra 250 litres of rain water.)
There are two cistern ball valves with isolation valves. One is for rain water and the other is for potable cold water supply. (There is a potable water supply to the loft in case we have droughts and I can switch between this and rain water for the loft CW tank.)
OUtside, I have all my guttering feeding into 8 off interconnected 600 litre IBC's. The reason why 600 litre IBC's were used is to use a narrow long dead end alleyway down the side of the house to hide these 8 off 600 IBCs. SO these will be stacked in a 2 high 4 long configuration.
I now have to choose a pump that will pump the rain water from the ground level interconnected IBCs up to the loft water tank. The pump must:
(a) be able to connect to 22mm pipework (b) Be able to pump from ground level up to the loft so that means a need a head of 10 metres (c) have an integrated pressure switch so it will start and stop automatically depending on what the ball valve in the loft tank is doing (d) be self priming
Any recommendations for a pump to fit the above criteria but without costing the earth?
I incidentally already have a Salamander shower booster pump and a spare CH pump in my possession in case these can be reused with modifications?
I can put this pump outside with the IBC's or in the loft next to the loft tank. Which is better and why?