Discuss Secondary Hot Water Return on Pumped Shower supply. in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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New Shower being installed - thermo mixer - new shower is around 60 feet from HW cyclinder, multiple swept 90 deg bends plus around 10 feet of vertical rise, so negative head - 22mm pipe is installed (15mm last 1 meter) - without pump - dribble so intend fitting dedicated Salmander 3 bar pump with cold mains stepped down to 2-3 bar to equalise.

Owner wants a hot water return to minimise hot water waiting time.
There is 15mm pipework in place but not connected anywhere.

Can't see how I can fit a HW return to a dedicated 3 bar pumped supply.
My thinking is a 3 bar supply would not take long to flow to the shower head.

Any ideas??
 
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W

Welder

You need to think this through. What happens to the pump when you install this return?
 
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Hi Dave, pump will sense flow and kick in taking the whole HW 22mm and return up to 3 bar back into HW cylinder. So my thinking is it cant be done unless someone has a bright idea or find a single pump that has a timer to run as a secondary return pump for say 30 mins before use, shutdown or autosense shower or basin use and then kick in again as at 3 bar to provide the required shower pressure.
 
W

Welder

It's a non starter. The only time you'd use a return like that is on an HP system such as an UVC.
 

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