Sun-Heat Standard System Features GAS BURNER • Burner and controls CSA listed for United States and Canada • Hot Surface ignition and electronic safety – No Pilot • 60,000, 80,000, 100,000, 125,000, 150,000, 175,000, 200,000 Btu/hr input sizes (natural or propane gas) • Combustion Air inlet collar • Sight glass for monitoring burner operation • Combustion air proving differential switch • Electrical & gas controls separated from combustion air stream • Burner Housing 18 GA.