Nickfromwales

Ok, then the rads upstairs must be where the system shunts air to, and then you bleed these off. That suggests the pump and valves etc are all lower than the first floor rads, and therefore you may not need an auto air vent in the system.

Just had this same enquiry with a project where the clients went with Nordan. They had options for bottom handle, top hinged etc, for folk who are less abled, so I would expect most of the big hitters are able to accommodate this requirement / request.

Ok. The auto bleed function on a pump is usually just it pulsing / stop-starting to ‘bump’ air around and out of the water circuit. To clarify, an automatic air vent is a piece of equipment that’s installed at the highest point of each circuit, which allows air to be released in your absence. Air comes out, and they they do a little ‘spit’ and then no more water comes out. When you auto-bled the pump, what exactly did you do?

To be accurately providing information, we’d really need to see detailed section drawings (or a really shit sketch on the back of an envelope) to say for sure. Whats the cavity insulation like?

This says single component failure then, not a build up of air stopping the show. One sensible ‘upgrade’ would be to have a manual air vent (thumb turn type) to vent the pipework atop the boiler, but I honestly doubt there’s a lifelong issue there if it’s run fine for a decade, plus then another 2 years after the rad swap.

In that case, up at that height, you can happily consider the steel and wood to be equalised for temp etc, imho, as they’re well with the heated and airtight envelope.

So many architects haven’t got a scooby-doo about these things. Even the SE’s tame associated, clueless. Constantly sense checking with Obi-Wan back at HQ, and just no confidence in anything he was looking at. Client rang me on speakerphone whilst the chap was on site, so I got to speak to him about the steelwork I spec’d and Obi-Wan had agreed over the phone; we made some slight changes, but beefed up certain elements to (over) compensate, and he was head-melted. After a lot of gibberish and flannel I just got a bit annoyed and said to go back to the office and just pass the bloody thing ffs. Myself 30+ years on the tools, and the steel fabricator & welder 35+ years, so I just said we’ve done more than a few of these over the years…..! Obi-Wan saw the adaptations, and signed it off without further comment. We put Bosig Phonotherm under the feet of the steels, where they sat on padstones, very nice product to work with and cuts / drills like a very dense particle board. Router / planer zoomed through it where I made profiles and recesses in it for the Norrsken doors and sliders etc. Blasted it with liquid DPC all around before then screwing it all into place and then blasting it with more. Available in sensible sizes too, unlike Compacfoam.

For floors at ground floor level, or for first floor joists?

“15 all……” 🤣

‘ckin hell…… ”Shots fired!!!!!!!!” 💣 💥 Lol. I thought it was only me that didn’t get their full 8 hours in last night

Most boilers have a drains off point at the underside of the boiler. Not all, but the majority. You can connect a hose to this, poke the other end down a drain, and open the drain off to pull water and air down / through / out of the hose. You do this with the system on and running btw. Can you have a look for a drain on the boiler? Dont mistakenly open the combustion chamber looking for it though(!) just look under it or take the white metal case off at most. If you don’t see it then, you don’t have one.

Panasonic uses the wall mounted controller for internal info. How the feck will yours know what's going on indoors if you don't have one? Other than the difference between flow and return, which would be cruder than a semi-sober welsh plumber.

WC will still prevail. Currently the rads are strangled. One step ahead, my man.........

Have we proven that L is getting there?

I'm not, the OP didn't say there was an issue there