Pressurizing a vented cylinder

[Chuck]

When a hot water system is changed from vented to unvented the local authority have to be notified. No G3-qualified person is going to do this work so that puts the responsibility on the householder to notify the LA and pay for them to inspect and approve the work. Failing to notify is a criminal offence.

IMO, the chance of an LA inspector approving your proposed installation is zero. My guess is they'll take one look declare the building dangerous, so it can't be occupied, until the work is remedied by a qualified plumber using the proper components.

 

[seanEE]

It's a bit late for April fools


That is why you have to have a ticket to install them. It prevents idiots from blowing up theirs and the neighbours house

pretty sure that's a bit more than 2bar

 

[fowlerboi]

When water turns to steam it expands 1600 times its volume. Your cylinder could be 0.1 bar and still do this without a vent and proper controls, which you wont have because your cylinder isn’t designed for it.

Quit being a moron

 

[Timmy D]

That's what i was thinking, I couldn't find anything online so thought id ask to see if i was missing something, ''of course its a good idea to get a porpuse built unit and i would never install a system like that'' but thanks for the input!

It’s cheaper to buy an unvented cylinder (8 bar) than a grade 1 copper vented (2.5 bar).

yeah i would never push it above rated pressure, just bellow rated pressure would be grand..

95% of cylinders out there are grade 3 (1 bar). Just pump the hot outlet