https://www.ebay.com/sch/i.html?_nkw=400000+Btuh+Gas+Unit+Heater+Ng+Lp&_sacat=0&_dmd=2

400000 Btuh Gas Unit Heater, Ng/Lp

Regular price
$5,264.00
Sale price
$3,960.00

Gas Unit Heater, Gas Type NG, Combustion Type Separated, Fan Type Blower, BtuH Input 400,000, BtuH Output 332,000, 4724 cfm Air Flow, 20.8 Full Load Amps, Gas Connection 3/4 In, Flue Dia. 6 In, O.C. Mounting 48-5/8 In, Height 34 In, Width 55 In, Depth 56-1/8 In, Indoor Air Discharge Height 24-1/2 In, Indoor Air Discharge Width 48-3/4 In, Heater Voltage 120VAC, 60 Hz, Air Temp. Rise 65 Degrees F, Installation Height 8 to 12 ft, Ignition System Direct Spark