Chris B wrote:
On 11/04/2021 18:00, Tim+ wrote:
I recharged the expansion vessel on my unvented HW system the other day and
since then weve had occasions when were getting a €śwater hammer€ť that
lasts for about 5-6 seconds. Starts off at a lowish frequency and the
frequency rises until the hammer disappears. Pretty loud and scary and I
really want to stop it happening.
All this only occurs when drawing off hot water quickly for a bath or
shower.
It certainly never used to do this so Im a bit puzzled. The expansion
vessel is linked by about 1.5 metres of pipe in a vertical run down to the
HW outlet from the tank.
Ive checked to see there was air in the pipe up to the vessel but there
doesnt appear to be any. Ive tried dropping the pressure a bit in the
vessel but it hasnt made any difference.
Any other suggestions (or explanations of why this is happening now)?
Tim
Does it sound like this (sound starts at 14 seconds after I have walked
to the bathroom and turned on the bath tap)
https://u.pcloud.link/publink/show?c...V8yDXIxbXeXFBk
I can tell you what caused it in my case, the expansion vessel had been
over pressured on the water side.
Cheers. Mine starts at a lower frequency but otherwise very similar. Ill
try dropping the pressure a bit more.
Tim
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