It is not approved to use leca blocks where smoke and heat will pass, however, other parts of a stove can be in leca if they are just for appearance's sake.
Where can you find that information?
Lightweight concrete is fire-rated depending on the treatment, right? But not untreated, right!?
When I worked as a mason, solid bricks were the norm for smoke channels, facade bricks were not approved. I believe it's the chimney sweep you should check with to get the exact regulations.
Didn't feel like reading all the posts so I don't know if you've gotten an answer to it yet, but in the stove in the left picture, the upper part is sheet metal, painted with the same color as the plaster on the lower part. I have friends who have exactly one like that.
It is not approved to use Leca blocks where smoke and heat will go, although other parts of a stove can be in Leca that is just for show.
But this is information that you have taken out of thin air. Please refer to a source!
Just because you've worked as a mason doesn't necessarily mean more than that you've stacked bricks.
I have some difficulties with those privately designed standards hidden behind expensive logins. (Yes, I am not naive and understand that there is a desire to protect against competition by getting our presumably well-meaning authorities to work with non-transparent standards and increase regulatory complexity to suit the industry's already established companies.)
But it's fine to look at the open BBR to see the problems with Leca.
BBR 5:425 Chimneys go through some requirements, and LECA lacks in terms of tightness and durability.
It is simply too porous and allows gases to seep through. Even if it's plastered on both sides, there's still the problem that over time, heat will cause the plaster to crack and fall off, and then the combustion gases penetrate the leca structure. A third issue is that leca is cement-bound - and cement does not fare well when exposed to high temperatures over time, such as inside a fireplace. It crumbles and loses its load-bearing capacity.
I have the chimney sweep coming on Friday to inspect my own chimney (though it's made of steel plate) but I can just for fun check a bit what they are up to today, there might be some new rule that simply overturns my old knowledge.
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