The manual says a MAX of 150 PSI but are you possibly asking the minimum water flow to activate the unit? If so it is .58 GPM or 2.2 l/min.
Hello. let me help you. The water pressure is what it is in the house. In other words, the tankless water heater doesn't increase the pressure of the water, it only heats the water. There is no official minimum pressure but the minimum pressure you would be happy with in any home would be 20 pounds per square inch, PSI.
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