Click to expand Tap to zoom 715K BTU NG MEGATHERM INDOOR HEATER CSD1 (Commercial) Save Liquid error (product-badge line 32): -Infinity% $11,500.00 | / 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Electronic ignition Built-in draft diverter (indoor models) simplifies installation Integral pump assures proper water flow (models 500-1825) Automatic gas valve Stainless steel burners, with slide-out burner tray for easy maintenance and long life (models 500-1825) High temperature refractory firebox liner to 2000 deg F for greater efficiency Easy-to-service header flanges Corrosion-resistant glass-lined or bronze headers 8 tubes version