We have a recently installed unvented DHW system installed in an
inherited bungalow that we will soon be moving into. That system has
two expansion vessels, one for the CH and one for the DHW. OK, so far
so good, I get that. But does that mean that the incoming cold water
mains supply is also connected indirectly to the DHW expansion vessel,
via the DHW tank, albeit through a pressure reducer?
Thanks, that's more or less what I suspected. I asked because the
bungalow layout has two outside taps, one at the front, the other at
the back. The one at the front was a replacement for an original, and
being a replacement, also had to have a check valve added to the
pipework, which got nackered in the recent cold snap. But the one at
the back is at the end of a run of pipe that didn't get replaced and
has no check valve. I had remembered to turn off the water but forgot
I should also have drained it. Cold weather such as that is rare down
here. I just wondered what would happen if that tap froze and the ice
migrated back along the pipe a short way, thereby raising the pressure
in the rest of the pipework. I presume the expansion vessel would have
taken up the increase in pressure to some extent.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.