"Uncle Peter" wrote in message
news

We are talking about a one second blast of hot water from the pipe -
about a
kettle full of hot water - and then the PRV has done it's job and the
water
stops coming from the pipe.

It is impossible for that quantity of water to come through that thin pipe
in 1 second. The pressure would be enough to blast a hole in the
brickwork.


About 3 bar

--
Adam