Energy Saving Copper Heat Exchanger (HW-225 Available in Natural Gas Only)
ALL NON-FERROUS WATERWAYS
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 feet per second helps to prevent lime buildup and also scrubs extra heat from
the copper coil combustion chamber.
AUTOMATIC SAFETY CONTROLS AND ELECTRONIC IGNITION
Proven pilot ignition system provides flame failure response in less than 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
THERMAL BALANCER (HW-200M, HW225M)
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 (Not to be used on
booster recovery systems)
PRESSURE RELIEF VALVE
MAIN BURNER REGULATION
Factory adjusted for gas required
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 storage-type water heaters. Models are ASME certifi ed and are design-certified by
NSF International to NSF Sanitation 5. Models meet or exceed the thermal efficiency and standby
loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IESNA 90.1.