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what size heater recommended

You could be okay with a 7 Kilowatt heater (Tylo Sport 7, Tylo SuperSport 7 or Tylo Combi-U7), but if you have the budget, I would recommend an 8 Kilowatt model (Tylo Sport 8, Tylo SuperSport 8 or Tylo Combi-U8) The larger heater will preheat the sauna more quickly, and recover heat loss more quickly. For example, if someone opens/closes the door and lets some of the hot air out.