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Honestly, if it’s working reliably thats a winner - I wouldnt say worth re-doing.. but I'm no plumber either :D.. nor an electrician.. I'm an electronic engineer by day... I can get by with the electrics but good god it takes me a long time compared to you pros... Thanks so much for your help (+...

So with this scheme I can do a proper s-plan with a bypass and have it be fully pumped with all the safety stuff for the unvented cylinder? Happy days

I found the photo.. it was from this forum actually :). I think that’s what this is.. correct? Blanked off and AAV ?

Thank you both posts are helpful.. this is also my understanding ! Maybe I block off one return and block off one flow (and attach an AAV to the blocked off flow while I’m there). Both flow ports are at the top sides of the boiler and both returns are at the bottom sides. I think I saw a photo...

Many thanks, that helps ! So no pump or valve on DHW either… is yours also an unvented cylinder ? I suspect what happened with my property was it was once upon a time a vented gravity cylinder.. then at some point an unvented tank got dropped in but they didn’t bother updating the boiler...

Interesting thanks I didn’t know this.. c plan still on the cards then ! Can I be annoying and beg that you draw your setup or explain more please ? I’m so confused with how your pump works in a c plan .. it’s what I’ve been struggling with.. because your boiler must also have two flow/returns ...

Thanks. If I combine the two flow/returns from the boiler into one flow/return and I do a standard S-Plan, no relay needed right? The pump can run whenever the boiler fires for either CH or HW since it would be fully pumped... and no more gravity anything?

Like this maybe... ? I can't find anything online or in the bluebird 90/120 manual about how to terminate one of the flow/return pipes. :cry:

I'm happy to convert to real fully pumped s-plan .. but the boiler has two flow/return pipes.. how do i terminate one of those safely?

It has an expansion vessel on the cylinder too, actually.. thats something at least :)

It's 100% unvented and 100% doesnt have the necessary safety controls. It has a 90c over temp pressure relief valve, and a 3bar pressure reducing valve on the cold input but thats about it... thats why at a minimum I want to add back in the cylinder stat + add a valve to the HW side.

Could I remove one set of flow/return pipes from the boiler so I can do a fully pumped "more normal" s-plan ?

Hello We've just moved into a new (old, but new to us) house and I'm trying to improve the boiler & control that we've inherited (it needs replacing in all honesty but we've just spent all of our bunse on the house!).. The boiler is a bluebird 90/120.. Oil thing.. currently controlled via a...