EHUH40 Unit Heater 42,000 BTU 110v Single Speed

OB-4 water to air heat exchanger. 90,000 BTU, 18” x 16 1/4” x 3 1/2” sweat connections, 16” x 16” finned area

OB-3 Water to Air heat exchanger. 130,000 BTU, 20” x 18 1/4” x 3 1/2”, 18” x 18” finned area

OB1 Water to Air Heat Exchanger. 200,000 BTU, 26 1/4” x 24” x 5 1/2”, sweat connections, 24” x 23.75” finned area.