GUIDELINE 58 Sizing Dairy Farm Water Heater Systems deals specifically with sizing dairy farm water heaters for cleaning pipeline milker systems. To assure enough hot water for washing and sanitizing the entire pipeline milking system and bulk milk tank, a separate and dedicated water heating system is recommended. Incidental and non-critical hot water should be supplied by a separate water heater or refrigeration heat recovery unit. Hot water requirements depend on the size or capacity of the pipeline system and tank and on the cleaned-in-place (CIP) operation and timing of rinse/wash/rinse cycles. Information for calculating hot water requirements and sizing water heaters using electricity, oil or gas is included.