S
Stu.roberts
Hopefully 10 seconds cause once it's clear it's clear, u need to feel the pipes at the side of the cylinder if one of them is hot you know it's clear, just put hw on on it's own wait for the stat to kick in then pull it out it will make a bit of din then turn itoff put the stat back in and check the circs. DONT forget to put the stat back and don't leave itout to long