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It appears that the minimum requirement is for a sheet of 6mm fibre cement board as a non combustible surface to mount the fire on it, which is at least 500mm larger than the unit in all directions - plus the front of the unit must be a minimum of 1000mm from any fixed object or wall (Including the rear wall). So I'd say the only reason you shouldn't use marble is if it has a high moisture content and may 'crack' as it dries out from the heater or it is easily marked from use. Otherwise use it...

oklouise thanks for the ideas. We have actually really thought about the zoning. We want the two bedrooms on the southern side with a bathroom between for privacy. We also want the eastern lounge room to pop out as a dining room in that spot will waste a gorgeous view. We had a straight alfresco and thought it was all a bit hohum. I will attach the first and second drafts to see where we have come from. The first draft we had drawn was too boring for us ... Garry hated draft 2 as he thought it was too wide for solar access and didn't give cross ventilation (north to south or vv). It's only positive was the flow of west/east cross ventilation. Also the bathroom was too tucked away for guest use when we are using that nice alfresco area. We quickly scrapped all those ideas... LOL As I said, we like skillion roof lines and are planning on clerestory windows to maximise northern sun. Some raked ceilings will probably happen too (and definitely 9 foot ceilings in living areas). the mudroom/laundry will probably be incorporated into the hallway. Unlike some on this forum previously I don't object to entering through the laundry. It kind of gives a landing spot for groceries from the car on those cold days you don't want to leave the whole house open. The garage may actually be a carport to ensure we can have ventilation come through that way and to help us with budget.

Hi. I have read these comments and am really surprised - although a couple I share - i have the ten installed in room that is completely open on east side so on a minus 2 evening that’s what it is under the roof. the heater does smoke on start up so we leave the door open and wait until the fire is established Some may think this is a design issue and maybe it is but the cold steel will not draw warm air up until it’s warm. once that’s achieved the fire is beautiful. I don’t like the vermiculite tiles so am having a steel floor and back made with 50mm risers/dogs to life the kindling off the base and enable airflow underneath. That’s a choice not a fault. I have a Ned Kelly and it needs cleaning frequently too and its burn is far less efficient than the Scandia. I don’t burn 800mm logs but use standard RedGum and Sugar gum and the latter requires more heat energy to get going but once it’s burning it is also beautiful. the burn leaves almost no coals and logs retain shape but just turn to ash So in my view its more efficient than a few others I’ve seen and used inc the Ned BUT Customer service is useless and uninformed I was told the heater had fans and of course it doesn’t hence the thermals on top deck I can see people have had horror stories and experiences and that’s terrible but I’m happy as and would buy again I didn’t want to spend 10-15k as I wanted a large heater not a smaller one