The Raypak Hi Delta Low Nox Heater P-1802C 1800K NG Iid is part number 016068.The Hi Delta® line of fan-assisted combustion units offers solid performance with low emissions, flexible control, and easy-to-understand diagnostics.Features 83.1% efficiency Multiple vertical venting and sidewall venting options. All models indoor/outdoor certified Patented burner “security blanket” enhances staged combustion, minimizes installation/start-up issues, and protects burners from metal fatigue. 105ºF minimum inlet water temperature Cupro-nickel finned-tube heat exchanger with brass headers. AB 1953 compliant. VERSA IC® control package with LCD display Status display lights Cascade control of up to 8 units, no external sequencer required. Specifications Brand: Raypak Part Number: 016068 Application: Commercial Please confirm the part number matches your existing equipment before ordering.