Hot water back flowing

[Tom020]

Hi, I've got a cold water storage tank which feeds the hot water cylinder below. The hot water is backflowing up to the cold water tank and then overflowing now and again. If i put a non return valve on the cold feed to the cylinder would this just push the water up to the vent pipe? There are tmvs in the property so I'm thinking one is back feeding. Or maybe a split coil?

 

[Deleted member 120897]

I wouldn’t be putting a check valve on the cold feed to the cylinder, you need to find out what’s passing. Have you renewed anything recently?

 

[Tom020]

Thanks. Would there be an issue with putting a check valve on the cold feed? Nothing to the system has changed.

 

[Deleted member 120897]

There might not be enough pressure to open the check valve. It sounds like it’s a mains one pushing it out if the way.