A. O. Smith COBT-150, COBT-350 User Manual
Commercial Oil and Dual Fuel Water Heaters
COMMERCIAL OIL AND DUAL-FUEL
WATER HEATERS
A. O. Smith’s COF water heaters are fired on No. 1 or 2 fuel oil while the COBT models have the
versatility of operating with natural or propane gas and/or No. 1 or 2 oil. The COF/COBT models
include some of the largest and most powerful A. O. Smith tank-type water heating systems
available – with storage capacities up to 600 gallons and input up to 2.5 million BTUs per hour.
FULLY AUTOMATIC CONTROLS WITH SAFETY SHUTOFF — High temperature limit
control (manual reset). CSA Certified and ASME rated temperature and pressure relief valve.
Hinged door control compartment with key lock for ease of access. Two thermostats, upper and
lower, for accurate temperature control.
JACKET & INSULATION — Heavy gauge steel jacket with baked powder coat finish.
Insulated with high-density foam insulation that meets or exceed all required standards.
Meets or exceeds the thermal efficiency and/or standby loss requirements of the U.S.
Department of Energy and current edition ASHRAE/IESNA 90.1.
FEATURES
UL — Entire unit UL listed.
GLASS-LINED TANK — Exclusive corrosion protection with glass-lining on all interior
surfaces. Multiple anodes provide cathodic protection.
ASME CONSTRUCTION STANDARD — 160 PSI design pressure on all models.
OTHER FEATURES
MODELS
COF-150-140
through
COF-600-2500
and
COBT-150-350
through
COBT-600-2500
handhole inspection openings.
COF — OIL FIRED MODELS:
COBT — COMBINATION GAS/OIL:
OPTIONS
and ASME rated T&P relief valve.
3-YEAR LIMITED TANK WARRANTY
maximum operating performance. Contact your local sales representative of authorized startup agent to arrange a FREE certified start-up.
PG 1 OF 4
October 2012R
August 2009R
Revised April 2009
AOSTO20100
Commercial Oil and Dual Fuel Water Heaters
For high altitude areas above 2,000’, please advise altitude when ordering.
Back: 0 Inches
Sides: 0 inches
Top: 5 inches
A clearance of 24 inches is recommended from serviceable parts such as relief valve, power burner, drain valve and anodes (anodes are located on side above cold water inlet).
COF/COBT models are Category I appliances (Fan Assisted) and require a negative draft. These units should only be commonly vented with other
Category I negative draft appliances per the latest edition of the National Fuel Gas Code. An approved/listed Type “B” venting material is recommended.
A negative draft of -0.02” to -0.07” is required in the vent.
August 2009R
October 2012R
Revised April 2009 PG 2 OF 4
www.hotwater.com
AOSTO20100
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