Sign In to View Pricing & Availability
- Looking for model-specific repair or replacement parts? Enter the unit’s serial number into the A.O. Smith Parts Finder.
A.O. Smith® Burkay® Circulating Water Heater, Series: HW-225M, Natural Gas, 225000 Btu/hr Input, 1 in NPT Water, Electronic Ignition, Ultra Low Nox: No, 26-11/16 in W x 60 in H, Commercial/Residential/Dual: Commercial
- Rustproof because water comes in contact with nothing but copper, brass or bronze
- Copper transfers heat eight times faster than ferrous metals yet offer remarkable structural strength without excessive weight
- Free from the effects of thermal shock
- Efficient copper coil combustion chamber
- Continuous coils of tightly wound copper tubing form a unique combustion chamber
- Water circulating thru the coils, around the flame, captures radiant heat which may otherwise be lost
- High efficiency stainless steel burner developed especially for A.O. smith water heaters using the very latest burner principles
- Forced water circulation improves system efficiency
- Water moving at 2 to 4 ft per second helps to prevent lime buildup and also scrubs extra heat from the copper coil combustion chamber
- Proven pilot ignition system provides flame failure response in less than one second
- Redundant high limit controls and gas valves assure safe shutoff in the event of overheating or flame failure
- Requires 120 V 60 Hz, maximum inlet gas pressure of 14 in W.C and activation of heater by external temperature control
- Patented thermal balancer functions as a pump shutoff delay switch
- It allows the pump and heater to activate simultaneously but delays pump shut off for 120 +/- 30 seconds after heater shuts down
- This allows the high temperature water to clear the heater thus utilizing all heat that had been generated plus educing the scale forming tendencies of motionless hot water
- Jacket: Prefinished with a bonderized coating followed by a baked on enamel finish
- All models are design-certified by CSA international, according to ANSI Z21.10.3 - CSA 4.9 standards governing circulating water heaters
- Models are ASME certified and are design-certified by NSF international to NSF sanitation 5
- Models meet the thermal efficiency and standby loss requirements of the U.S department of energy and current edition of ASHRAE/IESNA 90.1
- Commercial / Residential / DualCommercialConnection Type1 in NPT WaterFuel TypeNatural GasIgnition TypeElectronicInput Capacity225,000 BTU/hrUltra Low NOxNoDimensions26-11/16 in W x 60 in HManufacturerA.O. SmithManufacturer #100122603SeriesHW-225M