16. How often does the heat transfer fluid have to be replaced?

Application conditions such as operating temperature, characteristics of the heat transfer fluid (quality of the water or oil), dirt in the temperature control circuit (consumer, connection lines), etc. play a very important role in this question. An absolute answer is therefore not possible.
Guidelines for water: Replace after about 2000 hours of operation, including additive. Guidelines for oil: Check after about 1000 hours and replace after about 2000 hours, including additive (= 1 year in 1-shift operation).

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