hi, had a call out last night, see if you can make anything of this; W/B24i located in back room of a fish&chippy. so they say 8pm 1 of the only 3 rads starts to leek from the drain plug (a lot) they tighten it up then 8.45 no hot water (ok the system is drained and so trips out) 9.30 BIG flood...