gdrummond

have domestic tank overflowing.fitted new cylinder ,header tank and new sealed system boiler about 2 years ago . never have to fill up sealed side (heating) but water pours out of domestic overflow and i mean pours like the coil in the cylinder has gone,had 5 new ball valves, overflow connection 5 inches below ,watch hot water expanding up cold feed which is the correct way for a cylinder but it keeps rising. normal y plan.i have 31 years ex ,had 2 gas technicians and 5 plumbers round who i know ,still pours out overflow any ideas?8i think it has to be the cylinder but customer has never topped up the filling loop in 2 years. cheers Graham

ProffesorPlumb

Tough one that is - would be interested myself to know the outcome

Hang on, are you saying there is an open vent on a sealed system?

buster

Hi, The system described does not make any sense.

ajs heating

shut off the mains stopcock see if it stops.
if so sounds like your have a faulty mixer valve or monobloc tap passing cold water mains to gravity hot water.
faulty non return valve.

TerryH

My appetite has been whetted....... what was the solution?

ajs heating

you won't see him again. got his advise

Tosh

Ooh I say AJ,

Harsh but true I feel he he he he

Confusios say: man who go to bed with itchy bum, wake up with smelly finger.