Water leak under my boiler, situated in porch, so left cover off overnight, leak is from seal between black cast iron bit and silver base (where pilot light window is). Heating came on this morning, with awful smell, smells like when you open radiator in car, that has overheated, with no water in rad. I had 2 small rads fitted a fortnite ago and system balanced, so heating was best its been in 5 years. Should my system have been flushed before, after it was drained down ? Its the old Gravity Fed system.
