Maradyne Marine Bus Heater Kit, 28,000 BTU, 12 v, Flush Mount, Unit Measures 9-1/2"W x 6-1/2"H x 9"D. Face plate 9-1/2" W x 6-1/2" H x 9" D. Includes the following accessories: (a)738567 MH-TA7000078 Switch Kit; (1) 739012 MH-TA00079 Wiring Harness 9'. Heater boxes are made from heavy-duty, glass-filled nylon and will not corrode. Inner wall strengthening plates with threaded 1/4-20 weld nuts. 5/8" hose fittings, 12 volt 3-speed fan. Tested to SAE J1171 and ISO 8846. Meets USCG requirements for ignition protection. 5-10 amp draw. This uses 5/8" water hear hose to connect to coolant system. Use part# HMH-160-06250