Hot Water Hammer

Joined
27 Jun 2010
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Location
Invernesshire
Country
United Kingdom
Hi folks,

System is a mains pressure one through a thermal store. No water hammer whatsoever on cold side. The bathroom and kitchen hot taps all produce hammer when turned OFF. The taps are lever ones which doesn't help, the missus cannot learn to do this with any amount of grace it's a slam off every damn time. I've drained the pipework down and refilled as per the usual instructions to no avail. It never did this when we moved here it was only after leaving the place in the winter and draining it down once that it started happening, so it's definitely not always been like this. I'm concerned the shuddering sounds like it is actually within the thermal store itself- is this possible and is it possibly on it's way out(15yo)? Only other alterations to the plumbing was removing/bypassing a TMV which was fitted as the hot water leaves the thermal store (it was great for luke warm baths and dish washing at 35c lol, getting 60C+ now). I'm all for removing the taps and putting in conventional turn ones that force you to close off slowly but "style over substance" missus doesn't want that, she'd rather the pipework shuddered itself to destruction than something that fixes it.... Not heard much good about the Hammer Arrestors looking at Screwfix reviews!? Might be worth trying one on the kitchen as it's most used, I assume I could fix one of them in line with the tap tails (would that be 1/2"? 3/4"?)
TIA
 
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Reads as if it's a shock wave coming back when flow is quickly shut off.
Are all pipes well clipped?
Can you put the tmv back in and see if it stops it?
Other than that, a small EV or shock arrestor - you'd have to try things out for something like this!
 

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