[Sneeky_King]

Hi there, Just wondering is it normal for cold water to be pushed up the hot water pipe from the mixer tap? We have a mixer tap on our kitchen sink and when I use the hot water its fine but when I turn on the cold water it turns cold and Noticed the hot water pipe that was hot before I turned on the cold water, then the hot water pipe turned cold. Could this cause the tank in the loft/attic to over fill?


Kind regards

 

[Nealtw]

More like the tank is not full, if you leave this running like this does it go back to normal after a few, minutes?

 

[Sneeky_King]

The tank is full, our system runs with a storage tank and then it feeds the hot water tank in the airing cupboard. We have only noticed this after we had a new mixer faucet installed on to the kitchen sink. Also the cold water valve leaks after using the cold tap but when just tapping the hot tap the cold stops dripping. :001_unsure:

Also the cold water source is fed directly to the mixer faucet.

 

[AllanJ]

Under some circumstances, when faucets are turned on, the pressure of the cold water at the mixer tap can be greater than or less than the pressure of the hot water at the same mixer tap. This can cause water to go straight across and back feed up the other side and only the water from the dominant side comes out the spout.

How old is the house? Are there any very old pipes (like more than 30 years old), that could have gotten arteriosclerosis?

If you adjust the two faucets can you eventually get warm water out of the mixer tap spout?

 

[Sneeky_King]

Under some circumstances, when faucets are turned on, the pressure of the cold water at the mixer tap can be greater than or less than the pressure of the hot water at the same mixer tap. This can cause water to go straight across and back feed up the other side and only the water from the dominant side comes out the spout.

How old is the house? Are there any very old pipes (like more than 30 years old), that could have gotten arteriosclerosis?

If you adjust the two faucets can you eventually get warm water out of the mixer tap spout?

The House is around 40 to 50 years old, We moved in to this house in 2002, The plumbing is original when the house was first built I believe. The hot water system uses a storage tank in the loft which feeds the hot water tank in the airing cupboard. The boiler is part of the fire in the living room. Would you know if the cold water going back up the hot water pipe to the hot water tank could cause a overflow of the main tank in the loft? But I do think the system has a no return valve fitting which is in the airing cupboard with the hot and central heating clock and the pump but not sure if thats why its happening.

Jason