Susitna Energy Systems

Toyotomi OM-128 Boiler


The Oil Miser 128HH from Toyotomi USA, Inc. is designed to solve domestic hot-water and hydronic-heating needs while saving money. The unit features a 148,000 BTU burner encased in a stainless-steel cabinet; compact size that allows a single-person direct-vent or chimney-vent installation; heavy-duty high-efficiency heat exchanger; is capable of burning No. 2 heating oil, No. 1 fuel oil or kerosene, provides continuous hot water at up to 240 gallons per hour; and is ETL approved for both residential houses and mobile homes. Energy star rated.


  • Continuous hot water
  • Compact size and 77 lb. weight allows for one person installation
  • Inlets/outlets on two sides for easy installation
  • Choice of direct vent or chimney vent
  • Cold start capability
  • Very quiet and reliable operation
  • Stainless steel heat exchanger and cabinet
  • Adjustable temperature differential for cycling control
  • Safe: ETL and home and mobile home approved
  • Proven trouble-free performance
  • Limited 10 year warranty
  • Has a 1/2 inch drain and 3/4 inch pressure valve connections on the left side and 1 1/4 inch connections for supply and return on the right side
  • Heat exchanger has easy access for servicing from the top without having to disconnect any water pipes
  • New temperature fuse that attaches to the heat exchanger, to cause shut down in case the top of the heat exchanger gets too hot
  • New timing sequence for the photo eye.



  • Combustion Type: Pressure Vapor
  • Flue Pipe and Chimney Connection: Forced Flue
  • Heating Supply System: On Demand
  • Purpose: Hot Water Supply, Hydronic Heating
  • Ignition: High Voltage Discharge Spark
  • Fuel: No. 2 or No. 1 Low Sulfur Fuel Oil, ULSD or 1-K
  • Efficiency: 87% Energy Star Rated
  • Hot Water Input: 148,000 BTU/h
  • Hot Water Output: 128,900 BTU/h
  • Maximum Hot Water Temperature: 176° F 
  • Flow Rate/ Temperature Rise: 6.2 Gal/m (40° F rise)
  • Fuel Consumption: 1.05 Gal/Hr
  • Capacity of Heat Exchanger: 5.10 Gal
  • Temperature Differential Settings: 3.6
  • Fuel system: External tank *(see manual)
  • Weight: 77 lbs (Empty)
  • Vent Pipe Hole: 4.75
  • Electrical Rating: 120 Volts AC, 60 Hz; Ignition - 120W, Burning - 98W
  • Dimensions (W x H x D): 12-5/8" x 27-3/4" x 22-1/2"




Please call store for pricing  907-337-1300

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