Brochure

22
Heavy-Duty Oil-Fired
COF/COBT Models
Large Volume High Output Oil and
Dual Fuel Water Heaters
Conservationist
®
COF models offer oil fuel burners (No. 1 or 2 oil).
COBT models feature combination gas/oil powered burners for the
versatility of operating with natural gas/propane and No. 1 or 2 oil.
Conservationist COF/COBT models include some of the largest and
most powerful A. O. Smith tank-type water heating systems
available – with storage/input options up to 600 gallons/2,500,000
BTU/hour and recoveries as high as 2,424 gallons/hour at 100°F rise.
All models feature fully automatic controls with safety shutoff, two
thermostats (upper and lower) for accurate temperature control,
and ASME tank construction.
COF (Oil-Fired Models)

Use either No. 1 or 2 fuel oil

3450 rpm motor

Multi-annular fuel containment combustor head

Oil ignition transformer

Integral 2-stage fuel unit and oil safety valve
COBT (Combination Gas/Oil-Fired Models)

Use either natural gas or propane and No. 1 or 2 fuel oil

3450 rpm motor

Multi-annular fuel containment combustor head

Gas/electric pilot and gas ignition transformer

Pilot and main pressure regulators

Air safety switch

Manual fuel-selector switch

Integral two-stage fuel unit
Fully Automatic Controls With Safety Shutoff

High temperature limit control (manual reset)

CSA Certified and ASME rated T&P relief valve

Hinged-door control compartment for easy access

Upper and lower thermostats for accurate temperature control
Blue Diamond
®
Glass Lining

Blue Diamond coating provides superior corrosion resistance
compared to industry-standard glass lining

Equipped with multiple anode rods for additional corrosion
protection
Heavy-Duty Jacket

Heavy gauge steel jacket with baked powder-coated finish
for durability

Two 3˝ handhole inspection openings
Maximum Hydrostatic Working Pressures

All COF and COBT models: 160 PSI
Compliance

Meets the Thermal efficiency and standby loss requirements
of the U.S. Department of Energy and current edition of
ASHRAE/IESNA90.1
Professional Start-Up Service Included

Required for activating warranty and assuring quality
performance
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