Scratching my head (open vent)

[Mranon1989]

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!

 

[SimonG]

Good luck

 

[EvilDrPorkChop]

UFH on open vent, forget it

 

[Mranon1989]

Good luck

Really?

 

[SimonG]

Really?

No

 

[Mranon1989]

No

I was being sarcastic as well, if you can give it learn to take it.

 

[SimonG]

I was being sarcastic as well, if you can give it learn to take it.

Shame I wasn't first time, petal.

 

[Mranon1989]

Mwah

 

[Mranon1989]

UFH on open vent, forget it

Had problems in the past I take it?

 

[EvilDrPorkChop]

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.