Ideal Geyser Temperature setting
Ideal setting is 50 to 55 degrees in summer and 60 to 65 degrees in winter. The setting should never be lower than 50 degrees as this will promote bacterial growth in the water.
Legionella bacteria tend to grow in the lower temperatures at the bottom of water heater; such bacteria can cause a form of pneumonia. … For example, temperatures under 50 C may increase the risk of Legionnaires‘ disease, a form of pneumonia, due to bacterial growth in the tank.