What is the minimum flow rate required for tankless water heater units to work effectively?
The minimum flow rate required for a tankless water heater unit to work effectively is typically between 0.5 to 0.6 gallons per minute. If the flow rate is less than this, the heater may not turn on or may shut off during a shower. Consulting a professional plumber is recommended for proper diagnosis and repair of tankless water heater issues.