Automatic Storage Heaters
Direct heat transfer from combustion of natural gas. All components of the water heater are incorporated into a single unit and can be installed without dependence on other water storage equipment.
Circulating Tank Heaters
Direct heat transfer from combustion of natural gas. Little limitation on size range.
Instantaneous Heaters
Direct heat transfer from combustion of natural gas or indirect heat transfer from remote source such as a boiler, cogeneration system, refrigeration system or waste heat. These systems have little water storage capacity and are typically used for a continuous, steady supply of hot water.
Hot Water Supply Boilers
Direct heat transfer from combustion of natural gas. Can meet very high temperature requirements.
Storage Type Water Heaters
Indirect heat transfer from remote source such as a boiler, cogeneration system, refrigeration system or waste heat. Designed for service conditions where hot water requirements are not constant or when a large volume of heated water must be held in storage to efficiently meet high peak demands.
Semi-Instantaneous Water Heaters
Indirect heat transfer from remote source such as a boiler, cogeneration system, refrigeration system or waste heat. Characterized by limited storage designed to meet a momentary surge of hot water.
Blending Water Heaters
Steam or hot water developed from a indirect source of heating equipment can be injected directly into the heated water. Often associated with point-of-use applications.