AO Smith HW-520 Burkay 520 Input MBtu Commercial Natural Gas Water Heater - 5 Year Warranty

Conservationist Commercial Boilers Energy Saving Products 80% Thermal Efficiency

Compliance
• These models meet the thermal efficency and standby loss requirements of the U.S. Department of Energy and current edition ASHRAE/IESNA 90.1
All Non-Ferrous Waterways
• All castings are made of Bronze or Brass. All water tubes are made from copper. Brazed joints or flare union construction make the heater immune to the effects of thermal shock and thermal cycling. A great boiler for domestic hot water supply systems
Efficient Copper Coil Combustion Chamber
• The combustion chamber is a heat exchanger formed from a two passage coil of tightly wound continuous copper tube. Water circulating through this coil surrounds the main burner and captures the radiant heat. A wrap of insulation on the outside of the coil retains the heat captured by the circulating water
Copper Heat Exchanger
• Directly above the coil and the main burner is a compact, horizontal, copper fin tube heat exchanger. The flue gases must pass through this efficient heat exchanger before leaving the boiler. This unique Burkay coil and heat exchanger design provide maximum heat transfer and proven field durability
Burkay Burner Maximizes Efficiency
• The patented Burkay burner uses primary air injection at up to 72 individual orifices plus secondary entrainment of air. Approved for installation on combustible floors as shipped from factory
Gas Valves
• Slow opening redundant gas valves ensure smooth light-off without flame roll-out or pilot outage
Thermal Balancer
• Patented pump delay system that allows boiler and pump to run simultaneously but delays pump shut off at end of heating cycle to remove usable heat from the heat exchanger and reduce the scale forming tendencies of motionless hot water
Automatic Safety Controls And Electronic Ignition
• Proven pilot ignition system provides flame failure response in under one (1) second. Redundant high limit controls and gas valves assure safe shutoff in the event of overheating or flame failure. Requires 120V 60Hz, maximum inlet gas pressure of 14" WC and activation of heater by external temperature control
Working Pressure
• ASME approved, hydrostatically tested and certified for 160 psi