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Type NWHO-3 Series Circulation Heaters (for Regular and Fuel Oil Heating) A B C 8-1/32” 12-5/16” 6-1/8” Thermostat Type AR Mounting Lugs 3/8” - 16 Threaded Holes - 1-1/2” Deep 1-1/4” Centers 1-3/8” Conduit Openings 1” Pipe Outlet 1” Pipe Inlet A B C 8-1/32” 12-5/16” 6-1/8” Thermostat Type AR Mounting Lugs 3/8” - 16 Threaded Holes - 1-1/2” Deep 1-1/4” Centers 1-3/8” Conduit Openings 1” Pipe Outlet 1” Pipe Inlet Specifications — Table A Regular Oil Heaters Model Volts Phase kW W/In2 Dimensions (In.) A B C NWHO-33015 NWHO-34515 NWHO-36015 NWHO-37515 NWHO-39015 240 or 480 1 or 3 s 3 4.5 6 7.5 9 23 32-15/16 32-15/16 42-15/16 55-7/16 55-7/16 22-1/2 22-1/2 32-1/2 45 45 16-1/2 16-1/2 26-1/2 39 39 Fuel Oil Heaters NWHO-30315 NWHO-30415 NWHO-30615 240 or 480 1 or 3 s 3 4 6 15 32-15/16 42-15/16 55-7/16 22-1/2 32-1/2 45 16-1/2 26-1/2 39 GENERAL WARNING: This heater is not intended for use in hazardous atmospheres where flammable vapors, gases, liquids or other combustible atmospheres are present as def...