We have Heatrae Sadia Amptec 9KW electric central heating boiler and 125 litre high efficiency hot water cylinder installed to replace the old powermax 155x gas boiler.
Then I started hearing running water noise from the celling of my bathrooms even when the boiler and central heating are switched off.
I also switched off my main cold water supply and flushed my toilet but the noise is still there.
So my best guess the is the noise caused by the central heating system.
Will the water or air in the central heating pipes make noise even when the boiler is switched off?
When I called the installer, they told me I need to check with my neighbour to see whether their toilets are having overflow. But will their toilet started having problem on the same day my new boiler get installed? Even they did happened, as I never be able to hear my neighbour flushing their toilet, I should also not be able to hear their toliet overflow.
Any advice will be much appreciated.