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Sterling Europa 460 hot water

R

ron_5069202

Has anyone got any ideas how to stop this, I keep getting the hot water draining back into the cold container i have fitted a new non return valve but it still keeps doing it but its not every time .

Ron
 
The only reason for hot water to drain back into the cold container is a faulty non-return valve on the hot water heater inlet.

Have you changed the correct NRV?
 
If it is the Carver/Truma 'crystal' water inlet then the non-return valve is in the stem where the jubilee clip can crush the stem and jam the valve. Make sure the clip is as far on as possible and that previous fitting has not made the stem oval.

Further if the heater is the Cascade then you have a non-return valve in the cold water inlet, if this is jammed open then as the water heats up the increased pressure will push hot water back into the cold feed.
 
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