Hi All! I hope you can give me some advise.
I had combi boiler (Viessman vitodens 100-w 30kW) installed about half year ago. Recently I start hearing one single bang when hot water is opened at any of taps around house. It sound like someone in other room will knock a radiator (not relly loud but you can hear it). After investigating a bit I found it's probably coming from heating circut flow as also when that happens I can see brief jump of pressure on a pressure gauge.
So it only happens when any tap is opened regardless heating is on or off. After closing hot water tap and opening again straight after it's not doing it - only after leave it for some time.
Or maybe it is totally normal with those boilers (as I had previously backboiler with open vented system)?
When I called my plumber (which was installing this boiler) he said (without seeing it) that he never had this kind of problem and start coming with all different possible ways to solve it, but I'm not really keen on spending my money to trial each option.
I had combi boiler (Viessman vitodens 100-w 30kW) installed about half year ago. Recently I start hearing one single bang when hot water is opened at any of taps around house. It sound like someone in other room will knock a radiator (not relly loud but you can hear it). After investigating a bit I found it's probably coming from heating circut flow as also when that happens I can see brief jump of pressure on a pressure gauge.
So it only happens when any tap is opened regardless heating is on or off. After closing hot water tap and opening again straight after it's not doing it - only after leave it for some time.
Or maybe it is totally normal with those boilers (as I had previously backboiler with open vented system)?
When I called my plumber (which was installing this boiler) he said (without seeing it) that he never had this kind of problem and start coming with all different possible ways to solve it, but I'm not really keen on spending my money to trial each option.
