Onoff

https://onlinelibrary.wiley.com/doi/abs/10.1002/maco.200290004

Did he say earth loop impedance?

I was thinking fill the container with the PCM post welding. Tbh they could have a fine thread filler cap. I'd hazard make the containment well and strong enough out of stainless and it would nigh on be immortal. You could even periodically swap out the PCM. I wonder if there's any mileage if someone had an old unit with failed containment to do just that.

Why not use a grade 316 marine grade stainless box to contain the PCM? Could be TIG welded and internally braced to limit "swelling". Thinking 316 (marine grade) stainless would be ok with the "salt" that is the SAT. OK this is ali but I know some mustard TIGists:

😉

Is this a new issue? Is the B20 RCBO he's fitted the same make as the C16 one it replaced? The type of RCD section within RCBOs can vary: https://www.electrical-installation.org/enwiki/Types_of_RCDs The individual RCBOs should have an RCD test applied to gauge tripping and also their ramp times. The fact that it's been upped to a 20A and not tripping is perhaps telling. B curve is for low inrush currents, C for medium and D for high. If it's an inrush issue then it's usual to go from B to C curve or even D not the other way. If the cumulative load is too much for the incoming supply then you might need to think about spreading it across phases if you have 3P coming in. Or timers. As for diversity on heating then in a domestic premises this would be 100% up to 10A + 50%. There are other ratings for other than domestic in the OSG. Find out the rating of each unit.

If the floors solid you could likely fix down 4 sides with CT1 or something.

I was worried you'd been ill when I read that!

Yes it will. We do ASA here no problem on the Bambu X1C:

I would print in ASA. The X1C will handle it without issue. ASA has something like ten times the UV resistance of ABS.

No probs at all cutting out for a niche. Consider your niche vs tile size carefully so as to end on a grout line, consider how the trims will sit etc. Oh, and use a tile spacing / levelling system, wish I had 😡

I'll raise you square guttering with 3D printed end cap etc.

If was @Andy T iirc. He retired from Sunamp circa 2018.

Salt 'n vinegar crisps? Found this that suggests SAT in it's raw state can suffer issues. I don't for a minute pretend to understand most of it but it seems to suggest SAT needs certain additives to be used successfully as a PCM. https://pmc.ncbi.nlm.nih.gov/articles/PMC7040703/

Sunamp-Thermino-Brochure-JUNE-2022-v2.2 (1).pdfIs the PCM in your "original" unit perhaps different to what's in their current Thermino range? PDF attached. Be interesting on how many similar failures they've had and whether the containment is fit for purpose. Imaging it splitting over a kid's room / cot.

Is there a standard lagging / thickness for MVHR duct in a cold roof?

Seriously, I'd be happy to pop down and help lift it out etc.

Would an extra pair(s) of hands help with the heavy lifting?

& it still leaks!

Poor bloke, of all the people who could have welcomed him back... 😂 Can't help thinking a 6 year life for a product, that then fails like that, isn't a great advert.

Welcome back! I still haven't finished the bathroom btw..

Illbrück FM330. The end.

Seal up that hole around the pipe for a start where it goes through the wall. Then insulate:

& other euphemisms...