Hi all,
Complete plumbing novice here, so please be gentle.
We have a sealed CH system, and recently had our boiler, hot water tank and pump replaced. Since then we've had the devil of a time getting air out of the system; it constantly finds its way to the boiler, which then races to boiling point, does a passable impression of a B-52 dropping cymbals on a tin roof, and switches off.
Today we noticed that the boiler that has been installed is an Ecotec Plus 418, which Vaillant describe as an open vent model. A quick search of these forums leads me to believe that these can be used in a sealed system, but only with "the right equipment".
Can anyone explain what equipment this might be? It seems to me that you'd need an automatic air vent very near the boiler, this being the main thing the 618 seems to have that the 418 doesn't. I can't see any such vent in evidence. There's a couple of regular bleed valves just above the boiler, but they're not automatic, and they have hardly any space to trap air. Are there any other things that would make it obvious an open vent boiler has been wrongly used in a closed vent system?
Any help will be greatly appreciated - I'd rather not accuse the installer of being an eejit without just cause...
DB
Complete plumbing novice here, so please be gentle.
We have a sealed CH system, and recently had our boiler, hot water tank and pump replaced. Since then we've had the devil of a time getting air out of the system; it constantly finds its way to the boiler, which then races to boiling point, does a passable impression of a B-52 dropping cymbals on a tin roof, and switches off.
Today we noticed that the boiler that has been installed is an Ecotec Plus 418, which Vaillant describe as an open vent model. A quick search of these forums leads me to believe that these can be used in a sealed system, but only with "the right equipment".
Can anyone explain what equipment this might be? It seems to me that you'd need an automatic air vent very near the boiler, this being the main thing the 618 seems to have that the 418 doesn't. I can't see any such vent in evidence. There's a couple of regular bleed valves just above the boiler, but they're not automatic, and they have hardly any space to trap air. Are there any other things that would make it obvious an open vent boiler has been wrongly used in a closed vent system?
Any help will be greatly appreciated - I'd rather not accuse the installer of being an eejit without just cause...
DB