Water Heating

Toyotomi OM-122DW

Semi On Demand Water Heater

Save energy and money with the Toyotomi OM-122 Semi On-Demand Water Heater. On-demand water heaters only heat water when you need it and never run out of hot water. Ultra efficient, compact, and quiet, Toyotomi on-demand water heaters are rated to heat up to 240 gallons per hour!

Toyotomi OM-122DW Features & Benefits

  • Economical: Some consumers have reduced hot water heating costs by up to 70
  • Heats the water you need, when you need it, up to 240 gallons per hour!
  • Consistent water temperature
  • Stainless steel heat exchanger
  • 88% efficient
  • Proven trouble-free performance
  • Safe: UL, CUL, home and mobile home approved
  • Direct vent (as shown below) or chimney vent
  • Small, compact size
  • Limited 10 Year Warranty
  • Learn more at ToyotomiUSA.com


Combustion Type – Pressure Vapor
Flue Pipe – Forced Flue
Heating – Instantaneous
Source of Water – Direct Connection to Main Supply


High Voltage Discharge Spark



Fuel Consumption

1.1 gal./hr

Fuel Type

ASTM D3699 K1 Kerosene
ASTM D396 No.1 Fuel Oil
ASTM D975 Ultra Low Sulphur Diesel (ULSD)
ASTM D396 No.2 Fuel Oil (home heating oil)


86 lbs. empty

Hot Water Output

148,000 BTU/hr

Max. Hot Water Temperature

155°F (approximately)

Water Flow Rate/Temperature Rise

6.1 gal./min. (40°F rise)
4.8 gal./min. (50°F rise)
4.0 gal./min. (60°F rise)
3.5 gal./min. (70°F rise)
3.0 gal./min. (80°F rise)

Capacity of Heat Exchanger

5.10 gallon

Area of Heat Transmission

9.7 ft.2

Fuel System


Dimensions (WxHxD)

12-5/8″ x 27-3/4″ x 22-1/2″

Vent Pipe Hole

4-3/4″ diameter

Maximum Length of Vent Pipe System

10 ft., 3 bends or less

Electrical Rating

120 Volts AC, 60 Hz
Ignition – 110W
Burning – 98W

Required Accessories

Fuel Strainer, Temp. & Pressure Relief Valve and Flue Pipe Installation Kit or 4 or 5-inch Chimney Adapter Kit

Exhaust Air Temperature

Less than 500°F


Quantity of Vapor – 1.1 GPH
Spraying Angle – 60°

Temperature Fuse


Electric Current Fuse


¹ Heat and vaporized water are produced by the combustion process of this water heater. This rating does not take into account heat loss due to condensation of water vapor.
² Existing tank or purchase tank from local supplier.

Comtec Distributing is the nation's leading wholesale distributor of high efficiency home heating and cooling products, specializing in Toyotomi direct vent heating systems and efficient oil stoves from Kuma.

Office Location

1500 Mott Road
Mt. Shasta, CA 96067
Open M-Th 8am-4pm PST

Get Directions


Contact Us

(800) 795-5925