We recently had our heating and water system replaced with a combi. One thing that's really frustrating and probably costing us money, the boiler fires every time a cold tap, toilet or appliance is closed. This also seems to cause a build up of pressure in the hot taps. We have fairly high flow rate and there is a bit of pipe hammer when you shut off the taps. In order to try and resolve I put a hammer arrestor under the kitchen sink (not where the stop cock is). This seems to have stopped it at that tap, but the others still do it. Short of spending 200 quid on arrestors for every appliance and outlet, what are my choices? I read an NRV on the cold feed into the boiler might help?
Note I have tried as much as possible to remove all air from the system but I suspect we have some dead legs buried in walls and floors from all the work that will have air in. Also I did get the plumber back and his solution was to reduce the tap flow by turning the shut offs a bit. He then legged it (and it hasn't worked, but has reduced it a bit)
Note I have tried as much as possible to remove all air from the system but I suspect we have some dead legs buried in walls and floors from all the work that will have air in. Also I did get the plumber back and his solution was to reduce the tap flow by turning the shut offs a bit. He then legged it (and it hasn't worked, but has reduced it a bit)