PowerPack Small-Volume ASME Commercial Electric Water Heaters from Rheem-Ruud are intended for smaller applications for which an ASME-rated unit has been specified. The new series is ideal for both new-construction projects, such as schools, government buildings and public parks, and commercial-replacement applications involving kilowatt inputs above 12 kW. The units feature heavier steel tanks that have been hydrostatically tested up to 300 psi, in accordance with Section IV, Part HLW, of the ASME Boiler and Pressure Vessel Code. Rheem-Ruud. Circle 10.