OAR 333-062-0120
Heaters
(1)
Fired water heaters installed after September 1, 1994, used exclusively for heating water for spa pools are considered pool boilers and are exempt from the requirements of ORS 480.510 (Short title) to 480.665 (Boiler and Pressure Vessel Law) if:(a)
Units are equipped with a flow switch or pressure switch set at a minimum of 1-1⁄2 psig;(b)
No intervening stop valves are installed on the discharge side of the unit;(c)
Discharge piping is not reduced from the engineering sizing of the fired heater;(d)
All units are equipped with an ASME-approved pressure and temperature relieving device set at 50 psig;(e)
The unit has a maximum of 10 gallons capacity contained within the unit; and(f)
The burner is wired in series with the recirculation pump.(2)
Where fuel-burning swimming pool heaters are provided for public spa pools, they shall:(a)
Be situated so that the pilot light, if present, is readily accessible;(b)
Be provided with an adequate supply of combustion air;(c)
Be equipped with metal or chlorinated polyvinyl chloride pipe (CPVC) for a minimum of 18 inches upstream and downstream of the heating equipment. However, where manufacturer’s recommended installation allows shorter lengths of CPVC, installation according to the manufacturer’s recommendation is allowed in lieu of 18 inches of CPVC if documentation of manufacturer’s recommendations is provided.(3)
Where electrical heaters are provided, they shall be installed in accordance with the Oregon Electrical Specialty Code, 2014 Edition.
Source:
Rule 333-062-0120 — Heaters, https://secure.sos.state.or.us/oard/view.action?ruleNumber=333-062-0120.