Two quick pics of the heater unit:
The sauna structure is not yet complete, and the clients have not yet used the sauna, so I cannot provide any info on the performance of the sauna.
A slight concern is that the structure is a simple overlapped plank structure - that's it. No insulation, no cladding, just one layer of
wood. Lots of holes where the planks meet at the corners, and where the corrugated roof meets the walls.
Considering that the heater is a 20cm diameter unit, I reckon it'll create more than
enough heat to compensate for the airy structure. It is located on the southern coast area of South Africa, so it's not like it gets very cold here.
I'll update on the performance of the sauna when I get feedback from the clients.