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Discuss I have central heating but no hot water in the Central Heating Forum area at Plumbers Forums

You need to find out of your cylinder stat is “ getting a live “ , has anybody knocked it , is it an unvented cylinder?


How can it be unvented cylinder if there is only 3 port valve. Correct me if am wrong on that if it’s unvented cylinder then there must be a two zone valve also after the 3 port Y plan.
 
How can it be unvented cylinder if there is only 3 port valve. Correct me if am wrong on that if it’s unvented cylinder then there must be a two zone valve also after the 3 port Y plan.

Yes it should..



Appologies wrong post, my fault
 
Last edited:
How can it be unvented cylinder if there is only 3 port valve. Correct me if am wrong on that if it’s unvented cylinder then there must be a two zone valve also after the 3 port Y plan.

That’s if it’s been done to regs and not a bodge install
 
Hi folks.

Better photo attached.

76817F86-69D4-4E9E-B4A4-F35CE4160813.jpeg
 
@ShaunCorbs do regs say you need a 2 port zone valve as well as a 3 port? That’s what I’m getting from this!?

Yes but I’ve come across 5 in the last year that don’t eg needed to be upgraded
 

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