Terminal Enclosure: E1 General Purpose is standard. E4 Moisture Resistant available. Elements: Seamless 0.315" diameter copper sheath heating element brazed to a 1" brass screw plug. Vessel: Available with galvanized steel or solid brass pipe body. Thermostat: Integral thermostat with 60 to 180°temperature range located inside the terminal enclosure. Mounting: Easy to install; minimal size and weight, no supporting brackets are required. Third Party: UL Listed - CSA Certification available (except NWHJRG-01-003P-E1 120V). APPLICATIONS Type NWHJR (Junior) can be used to supply hot water or boost water temperature anywhere in a water distribution system.