What about freezing temperatures?
Wood is a good natural insulation. If you expect to be away or do not intend to use your tub during freezing temperatures, drain it completely. Be sure to drain the heater. Do not freeze the bubble system, when you have drained the tub turn on the bubbles for 15 seconds and water from the air jets will come out.

How long do I heat the hot tub?
It takes about 3 - 4 hours to heat up the tub full of water. Heating time varies depending on the weather, dryness of firewood and the initial temperature of water. To get the best result add firewood in every 30 minutes. It is important to keep the wooden cover on the tub, which reduces the cooling of water.

What is a recommended water temperature?
Recommended water temperature is 37-38 °C. If water is less warm than body temperature the bather will feel cold quite soon. Water temperature over 39 °C is not bearable for long time. Defenately it is not recommended for people with cardiac or high blood-pressure problems. Hot temperature baths have a strong sauna effect.