A while back a friend asked me if there was any way he could have a warm water supply outside for washing his dog.
As there was easy access to hot and cold supplies inside I fitted one of these.
It worked fine for several months but then water stopped coming out of the tap. Sometimes if you waited the flow would start and it would produce premixed warm water. Eventually it stopped working altogether.
Thinking that he?d just been unlucky my friend opted to buy a new valve and now a month after fitting the same thing is happening. All rather annoying.
Before fitting the new valve I blew through the non-return valves and discovered that they needed a fair bit of pressure to persuade the valve to ?crack open? the first time, after that they seemed to open reasonably easily.
It seems likely to me that the HW non-return valve is sticking on its seat, perhaps because it?s being exposed to reverse mains pressure cold water when the outside tap is off.
Now I?m sure I could disassemble the things and blow through the valve again to free it but I would really rather not have to keep doing this. One thought that occurs to me is that if I could think of a simple way to produce an upstream ?pressure pulse? above the non-return valve I could pop it off it?s sticky seat.
Long term answer may be to just go back to external H & C taps but he does like the pre-mixed warm water.
Any suggestions?
Tim