How do I heat the hot tub?
Once the fire is started, add wood every 20 minutes or so to maintain heating intensity. When you are getting close to the desired temperature, stop adding wood and close the air supply. This will reduce the burning intensity and stabilise the temperature of the water rather than continue to increase it.
We recommend splitting every log into several smaller pieces for a greater surface of contact with the fire and thus faster heating. Do not be afraid to fill the stove completely, but do not overload it either.