If you have a gas-heated hot tub/terrace pool/bathtub, you must empty the water after your bath during the winter. You must also ensure that the water flows out of the hoses so that they do not freeze. The gas heater and the gas must be stored in a frost-free area when not in use.
If it is very cold outside, it is also important to keep an eye on the gas heater while it is heating, if, for example, the gas runs out or freezes during heating, the gas heater will stop, and there is a risk that the hoses will freeze if you do not have the gas heater under supervision. Also keep in mind that the battery in the gas heater runs out faster during the winter and therefore needs to be changed more often.