The boiler is a Vokera Linea. Is there any point in putting a non return
valve in the hot water pipe after the boiler, as well as in the cold
water feed to the boiler?

Johan

Doctor Evil wrote:

snip


It could be that through the combi when a tap is opened the pressure becomes
negative in relation to the rest of the cold water pipework. When you close
the tap the pressure increases in the pipework and moves across the combi
and activates the flow switch, or the 3-way valve. What make of combi, they
don't all work the same way?

You could

1. Insert a none return valve just before the combi. Then this will not
allow pressure to lower inside the combi and hot water pipework.

2. Take the combi cold feed right back to the stop cock, making this supply
dedicated to the combi only. Have the cold water taps tee off this pipe at
the stop cock.

Try No. 1 first.



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