Hello,
I've bought a twin-impeller 2 Bar Watermill pump to drive my new mixer shower, but need some advice on running the pipes. The handbook says the outlet pipes need to be vertical to prevent problems with the flow switches, but I somehow need to get the outlets going down under the floor and into the bathroom next door. I've considered loops that come straight up out of the pump, then loop down below the floor. Does that sound sensible, or can someone suggest a better solution?
Thanks
These pumps are usually OK as long as you have a slightly higher head of water on the supply side of them compared to the highest point of the shower head. As long as you are taking the outlets down under a dividing wall and then straight up to the shower mixer you should find it fine. Trying to take loops off the pump outlets and running them for metres under the floor before lifting to the mixer is not a great idea.
If you have the shower over a bath, then you can take the outlets through the wall above the pump height but below the top of the bath roll (edge), that way the outlets are rising directly when they leave the pump.
From your description I take it the pump is being installed in a cupboard next to the bathroom, so it might be possible to run the pipework up the wall in the cupboard then directly through to the mixer valve.
I've never found this to be a problem. The Watermill pumps are designed to be mounted with the I/Ps and O/Ps at the top of the pump. The flow valve is in the output side and gravity operated, which is why they specify the outputs as requiring an upward flow. There is no problem to taking the output feeds upwards, then through a loop to below the floor. If this is the standard push fit flexible hose connections, the only problem is that the hoses are too short and stiff to bend through a 180 degree loop. You would need to add a couple of 90degree elbows to achieve the loop back. It's worth considering adding some full bore stop valves adjacent to the pump, the flow valves are IME not long lived (5yrs?) and it makes replacing them much easier. Distance is also not a problem, I've some feeds which are >30M with no problems ( apart from the pressure being too high for the shower head connections, which leads to washing the ceiling!) Hope this helps.
regards Capitol
Thanks very much guys, loops it is.
Mark
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