More relevant, it would prevent reverse flow when drawing cold water upstream of the boiler, keeping the hot water (and air in the dead legs) at the higher static pressure. Thus, when the cold draw-off ceases and the lower dynamic pressure rises to the higher static pressure there is no forward flow through the boiler to compress the air trapped in the dead-legs.
True, I realised that, andt it would actually limit the problem more than I expected.
Agreed! So you're right it would only be if the water hammer pressure from the cold shutoff is greater than the previous hot shutoff. IE you turn off the hot gently, then later turn off the cold more quickly
Haha. To be honest I was impressed with the work the installer did, there was a lot of pipework re-routing involved and they did and very neat and tidy job. They did miss a couple of the basics though, a few radiators in the further parts of the house didn't get bled when the system was refilled and this pipework in question as well.so happy your diy assisted install is now complete
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