Bronze pump fitted to hot outlet

[tolly]

Just a quick one is there any reason why a bronze pump cant be fitted to the hot outlet on an unvented with the secondary return, teeing into the cylinder cold feed with swept tee (cylinder has no secondary return tapping)

 

[Megaflo-Experts]

It will restrict the flow to the hot water outlet.
Have the pump on the return pipe work, pumping towards the cylinder.

 

[Ermintrude]

Just before the swept bend

 

[Grumpy old Plum]

read cylinder manufactures instructions but a non return valve may be required on cold feed to stop contamination of cold main

 

[tolly]

Cheers guys, I guess seeing as there is 2 cylinders in parallel (i.e they each have there own cold feed with cold water combination valves etc) that I can only put the bronze pump on one of the cylinders then? hence my idea was putting the bronze pump on the hw outlet just after the two hots (one from each cyl) tee together, then my secondary return would have tee'd back into each of the cylinders cold feeds with 2 swept tee's just before the cold inlets. Not to worry though, I can live with the secondary circulation only being on one cylinder!

Hope that makes sense.

 

[tolly]

Also theres a check valve on each of the cold water combination valves. I don't want another check valve where the bronze pump would go (last connection before cold inlet) as the tee off for the EV is just after cold combi valve.

 

[Ermintrude]

read cylinder manufactures instructions but a non return valve may be required on cold feed to stop contamination of cold main

100% required

 

[tolly]

Ahhh, I didn't read your post properly ME, late on a Friday and everything. I thought you were on about having the bronze pump actually inline on the cold inlet with the secondary return swept tee just before that. Left me wondering how it would be any more likely to reduce flow rate than it would be on hot outlet.

If the bronze pump is on the secondary return coming back I can then just tee it up coming out of the pump and take a return back to each cyl which then tee's into each cold inlet with swept tee's. :teeth_smile:

Which means no reduced flow as the cold inlet nor the hot outlet have a circulator to go though and I can have both cylinders on the secondary return.

Thanks for the help everyone. I feel silly now!

 

[tolly]

Also, I will fit check valve on secondary return just after the bronze pump.