Hot water supply heaters are designed for applications that require high inputs and large volumes of stored hot water. Rheem hot water supply heaters are designed to provide hot water service to a variety of commercial applications when used in conjunction with an appropriately sized storage tank. Choose from 82 percent thermal efficiency models that range from 136000-1826000 Btu/h and have maximum temperature setting of 180 deg F. Applications include indoor installation and for use with or without a circulating pump.