Hi Mark, thank you for your reply. No, I simply turned the green knob connected on the larger tank. The air came out, with some water, from that opening (see picture)
Dear all,
In my flat there is an electric immersion heather (with a timer, so it works daily from 2 am to 7 am) and a large water tank. Two days ago around midnight I heard some noise coming from the cupboard where the tank is, like running water, with some gurgling sound too.
I thought that...