OAR 918-225-0300: Exemptions for Fired Water Heaters

Fired water heaters used exclusively for heating water for swimming pools or spas are considered pool boilers and are exempt from the requirements of ORS 480.510 to 480.665 if: (1) Units are equipped with a flow switch or pressure switch set at a minimum of 1-1/2 psig; (2) No intervening stop valves are installed on the discharge side of the unit; (3) Discharge piping is not reduced from the engineered sizing of the fired heater; (4) All units are equipped with an ASME-approved pressure relieving device set at 50 psig or lower; (5) The unit has a maximum of ten gallons capacity contained within the unit; and (6) The burner is wired in series with the circulating pump.