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Why is there a minimum water volume of 5.3 gallons (20 liters) in the hydronic system?

April 26, 2017hydronic liters minimum system volume water

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Why is there a minimum water volume of 5.3 gallons (20 liters) in the hydronic system?

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The minimum water volume is to ensure complete defrost cycles and to eliminate short cycling of the outdoor unit. This allows the system to operate efficiently and reliable. Do not include the water volume from the hydrobox in the system minimum water volume.