Hi everyone,
Hoping someone can answer a question that's been frying my noggin. I won't bore you with reasons for asking, but what I wanted to know is:
I have a open vent system (F/E and CWS in loft) and h/w cylinder in airing cupboard. I know the cylinder has a vent/ expansion pipe that goes into the loft, along the loft floor and up and over and into the CWS tank. I know water level in this pipe will be same as water level in CWS tank. Question is, when the hot water in cylinder is being heated, does the water in this expansion / vent pipe also get hot, so would steam come out of the end of the expansion/vent pipe (into the CWS tank)? Or does the water in the expansion pipe stay cold? Thank you in advance