Pocster Posted October 21, 2019 Posted October 21, 2019 Ok ! I’ve not been to look at this yet but ... At the top of the house loft room . When tenant flushed toilet wall mounted water heater ( one of those crap things ) buzzes . Only way to stop it is open the cold tap . This has only just started happening- i’m Assuming some air / vacuum issue ????
Ferdinand Posted October 21, 2019 Posted October 21, 2019 (edited) Mountings or pre-water-hammer? If you have an onset of unexpected water hammer, I am sure T will let you know pronto. Rubber bushes indicated? Edited October 21, 2019 by Ferdinand
Pocster Posted October 21, 2019 Author Posted October 21, 2019 12 minutes ago, Ferdinand said: Mountings or pre-water-hammer? If you have an onset of unexpected water hammer, I am sure T will let you know pronto. Rubber bushes indicated? Can only go by what he’s told me . The water heater buzzes directly after toilet flushed . You’re being too technical for me with man flu !
PeterW Posted October 21, 2019 Posted October 21, 2019 Water hammer most likely. Put a 1 litre expansion vessel on the cold inlet to the water heater (assuming its in a cupboard..?)
Pocster Posted October 21, 2019 Author Posted October 21, 2019 10 minutes ago, PeterW said: Water hammer most likely. Put a 1 litre expansion vessel on the cold inlet to the water heater (assuming its in a cupboard..?) The water heater is above the sink . This type of thing https://www.plumbnation.co.uk/site/elson-3kw-compact-water-heater-ehw3/ Why would it happen all of a sudden though? ; been there for many years.
PeterW Posted October 21, 2019 Posted October 21, 2019 Increase in water pressure from the street is the usual one. Or a pipe coming lose from a clip allowing it to vibrate.
Pocster Posted October 21, 2019 Author Posted October 21, 2019 Just now, PeterW said: Increase in water pressure from the street is the usual one. Or a pipe coming lose from a clip allowing it to vibrate. Ok. I'll check tomorrow - if it doesn't seem like that I'll put a video up. Cheers
redtop Posted October 21, 2019 Posted October 21, 2019 we had a terrible one, noise throughout the pipes. ended up being a leaky shower head!
Pocster Posted October 22, 2019 Author Posted October 22, 2019 Yeah it's definitely water hammer. So this means inlet pressure too high? There is a stop tap feeding the toilet and water heater - is it as simple as turn that down a bit?
PeterW Posted October 22, 2019 Posted October 22, 2019 12 minutes ago, pocster said: Yeah it's definitely water hammer. So this means inlet pressure too high? There is a stop tap feeding the toilet and water heater - is it as simple as turn that down a bit? No because all that does is reduce flow not pressure.
Pocster Posted October 22, 2019 Author Posted October 22, 2019 18 minutes ago, PeterW said: No because all that does is reduce flow not pressure. Ah!; so what is the solution?
Pocster Posted October 22, 2019 Author Posted October 22, 2019 1 minute ago, Mr Punter said: Pressure reducing valve? Like this? https://www.toolstation.com/pressure-reducing-valve-and-gauge/p11827
Mr Punter Posted October 22, 2019 Posted October 22, 2019 Yes but I don't know if it will solve your problem. (any of them). 1
Pocster Posted October 22, 2019 Author Posted October 22, 2019 1 minute ago, Mr Punter said: Yes but I don't know if it will solve your problem. (any of them). Nor me!. Reviews of PRV don't seem particularly favourable i.e. set it for 1bar and the pressure creeps up. By reducing the flow though won't I reduce the pressure?. My physics on this not too hot! - I *assume* the 2 are related like volts to amps....... ?
Pocster Posted October 22, 2019 Author Posted October 22, 2019 25 minutes ago, Mr Punter said: Flow rate is not pressure. Yeah I know - but aren’t they proportional or some how related ? . A plumber I quickly spoke to said it might be the cistern . Once full as it stops filling that can cause the hammer ...
PeterW Posted October 22, 2019 Posted October 22, 2019 37 minutes ago, pocster said: Ah!; so what is the solution? Err this ..?? Just add a an expansion vessel to the supply line
Pocster Posted October 22, 2019 Author Posted October 22, 2019 1 minute ago, PeterW said: Err this ..?? Just add a an expansion vessel to the supply line As it’s a pressured unit assume I need a qualified to the correct level plumber for this ? I.e not just any plumber
Carrerahill Posted October 22, 2019 Posted October 22, 2019 (edited) 36 minutes ago, pocster said: As it’s a pressured unit assume I need a qualified to the correct level plumber for this ? I.e not just any plumber No - it's a water pipe. Only need to worry if you are actually working on oil or gas lines or the appliances themselves. I could go and install a whole DHW/CH system right now and only have the gas man do the gas and the flue - in fact, I could lay in the pipes, solder them together but just not connect at the gas meter or the appliance - gas fitter does that and does the pressure test and at that can certify your work - many would not do this for obvious reasons but it is not illegal. Edited October 22, 2019 by Carrerahill 1
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