Then make sure you get one size bigger for your heater than recommended by the factory specs for the size that you are building. It will warm up faster and will maintain the temp better. And if you throu the water on a rocks - it will heat them up faster too. Please let me know how you succeeding.... I've got Russian "veniks" for sauna in my garage, ready to go( but nowhere to go yet).. I used to take those to the Russian sauna in Calgary. But the place got too busy and it is hard to get in on a short notice.
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