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Discuss Scratching my head (open vent) in the Central Heating Forum area at PlumbersForums.net

Mranon1989

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I need to tap in to the central heating due to an extension with underfloor heating that’s gone in. I want to be more than sure before tapping into the system due to its complexity and being an open vent I’m going to freeze the pipes I need to, so I can work on them. I was hoping to double check on here to avoid making a mistake.

The two 28’s I believe are the flow and returns for the cylinder and the two 22’s on the left are for the Heating. I noticed there’s a tee branching off and running alongside the heating pipes. Is that a bypass or the actual vent for the heating? Never worked on these systems before so sorry if I come across as clueless.

I think I’ve attached a photo of the boiler. Thanks!

EE5F2369-DA86-4648-AB8F-94909163C386.jpeg

1A6EC646-1238-4959-9979-EA880D31DE3C.jpeg
 
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Had problems in the past I take it?
IMO open vented and UFH is just bad practice. Air locks, more risk of dirt in system (Imagine a blocked UFH circuit!), more noisy. TBH running UFH off that boiler anyway wouldn't be ideal, they need a new boiler and system upgrade! UFH running more often, the HW is always going to be on due to the gravity. There's loads of reasons for suggesting an upgrade is due.
 
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Mranon1989

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IMO open vented and UFH is just bad practice. Air locks, more risk of dirt in system (Imagine a blocked UFH circuit!), more noisy. TBH running UFH off that boiler anyway wouldn't be ideal, they need a new boiler and system upgrade! UFH running more often, the HW is always going to be on due to the gravity. There's loads of reasons for suggesting an upgrade is due.
I agree with you, I did suggest ages ago but they were adamant on keeping the same system. I just want to tap into the right pipes, get it running and walk away to be honest.
 
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I agree with you, I did suggest ages ago but they were adamant on keeping the same system. I just want to tap into the right pipes, get it running and walk away to be honest.
To be honest you should have advised them that UFH isn't suitable for that system and refused to do it.

And in terms of getting it going and walking away, I don't think it'll ever work properly. You're opening a can of worms, that I wouldn't be opening :confused:
 
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Mranon1989

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Well no mention of underfloor not working on open vent systems in the guides used throughout the industry and no one willing to just tell me so I’m just figure it out myself. Thanks for nothing. Lovely peeps
 
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SimonG

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Pope on a soap, thought the op was a diyer.

Ye gads!!
 

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