This is a very simple set up. The HWS has an inlet from the mains. There is
a ball cock control on the inlet to the HWS. It is gravity feed from the HWS
down a pipe to the bath. The bath has separate hot and cold taps but a
single outlet. The pipe then continues on to the vanity and further on to a
shower. If I turn on the hot tap at the bath, no water comes out. If I then
go and turn on the hot tap on the vanity, water comes out of the vanity tap
and then the water comes out of the bath hot tap. If I turn off the vanity
hot tap, the bath hot tap functions properly. I have to repeat the process
the next time I want to use the bath hot tap. I think I have photos from
when this was being constructed if that would help. These would show the
layout that is now behind the walls.
I thought so, it's the demand control valve.
Maintains the level in your "resevoir"
The resevoir and everything below it is your gravity fed system.
(And the most likely cause of "weird effects".
I was concerned you might have had an open heat exchange
set up.. (Trickle down the roof to a trough.
To estimate the total pressure available in your system,
measure the height from min/max resevoir, to the two
outlets in question (vanity, and bath)
32ft = 14.7 psi or abvout 5 psi for every 10 feet of height above the exit
The bath is upstream to the vanity.
So the effects are due to height - Not much pressure so inches count..
The vanity must be suffiently lower to allow the flow to start,
On a marginal set up like this, the time it takes the flow to be
established counts too.
What you call "normal" would likely have others call a plumber. :)
Might provide a chuckle, but not likely.
You're going to figure it out, not me.
----- My favorite quote -----
"A pessimist sees the difficulty in every opportunity;
an optimist sees the opportunity in every difficulty."
Sir Winston Churchill (1874-1965)
The pressure is not great but sufficient. The vanity tap is actually about
two feet higher than the bath tap. When they both flow, they are of equal
pressure. When these were first installed, both taps had equal flow. It is
only recently that this change has occurred.
I'm no plumber but it sounds like you have some sort of airlock
problem. You might try another group even a physics one (if you have
the photos so they can quibble about the difference in metric to
imperial units and any other childish thing they can come up with) at:
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