Open Vent to Sealed

I've currently got an open vent system that includes a recently installed Vaillant EcoTec Plus 424 boiler. Does anyone know for sure whether this boiler can be used in a sealed system?

I currently have to use a pump on the shower feeds but it's noisy and has to be used early morning when the family are still in bed. The hot water pressure to the taps elsewhere isn't great, but the cold is absolutely fine, so I'm considering the option of going down the sealed route.

I don't know what size the current cylinder is but does anyone know what a ballpark figure would be to get the job done? It's an 18 year old 4 bed detached house if that helps.

Thanks.

Depends on many factors, how easy is it to get a discharge pipe from the cylinder to outside, what size is the current water main as the chances are it will only be 15mm copper which is to small, and your location as that plays a part in labour rates.

It's very hard to give prices without doing an on site visit.

You're a little confused.

If you change to an unvented cylinder the boiler could still be left on an open vented system they're two different things

And yes the boiler is fine to use with an unvented cylinder whether you seal the system or not

Razor900 said:

You're a little confused.

If you change to an unvented cylinder the boiler could still be left on an open vented system they're two different things

Click to expand...

First of all, thanks for the replies!

Yes, I clearly am confused! I thought that an unvented cylinder meant that the whole system was no longer open vent. So does a change to an unvented cylinder then result in a system with mains pressure hot water?

Presumably it is still necessary to run a pipe from the cylinder to outside?

Thinking of them as two completely separate systems may mske it easier.

You can have either the heating or the hot water side sealed or open vented.

You're talking about an unvented cylinder which means putting the hot water supply under mains pressure and its fine with your system depending on your incoming water pressure and flow. You will need a route from the cylinder to outside as said for the discharge pipe - and it must be horizontal or falling it can't go up!