Hello, please forgive the stupid question, I'm a new homeowner so very noob. I've just discovered that water has been dripping through the tundish of our unvented hot water cylinder. A bit concerned that it may explode in the middle of the night. How can I "turn it off" safely while we wait for a plumber? So far all I have done is turning off the immersion heater (which is controlled by an economy 7 switch), but the water still continues dripping.
Many thanks!
Many thanks!