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Mr. Heater® Ventless Gas Blue Flame Heater 20,000 - 30,000 BTU

QC Supply Part #: 21044
Shipping: Standard
Price From: $189.99 - $229.99

Includes a factory-installed thermostat along with a battery operated electronic ignition.

Please Note:
  • This item can not ship to California or Canada
  • cannot ship via USPS


Operating heater above elevations of 4,500 feet could cause pilot/ODS to shutdown heater.
Manufacturer sold out for season on the optional blower fan kit.
Seasonal item; will have more available in the fall


This Ventless, Wall-Mount Blue Flame Heater from Mr. Heater® runs on either propane or natural gas and includes a factory-installed thermostat. The heater has a battery-operated electronic ignition. Available in 20,000 or 30,000 BTU.


  • Ignition System: Electronic manual ignitor, one "AA" battery is required to operate ignitor (no matches or lighter needed)
  • Convenient: Comfort control adjustable thermostat
  • Easy To Install: Wall mount or free standing (no venting or chimney required)
  • Safe: Low oxygen shut-off sensor
  • Operates During Power Outages: without electricity
  • Economical: 99.9% efficiency
  • Blower sold separately (#20985)
  • 4,500' high altitude restriction

Great For:

  • Rec Rooms
  • Enclosed Porches
  • Room Additions
  • Cabins
  • Workshops
BTU Rating 20,000 20,000 30,000 30,000
Dimensions 19" W x 24" H x 8" D 23.5" W x 24" H x 8" D
Weight 27 lbs 31 lbs
Burn Rate 0.926 lbs/hr 0.020 MCF 1.389 lbs/hr 0.030 MCF
Variable Output No No No No
Heats Up To:
Approx. Sq. Ft
500 500 750 750
Fuel Propane Natural Gas Propane Natural Gas
Min. Recommended
Tank Size
20 lb N/A 20 lb N/A
Certified Yes Yes Yes Yes
Low Oxygen
Shut-Off Switch
Yes Yes Yes Yes
Legs Included Yes Yes Yes Yes
Wall Mount
Hardware Included
Yes Yes Yes Yes
Ignition Electronic Electronic Electronic Electronic
Thermostat Yes Yes Yes Yes
Integrated Blower Fan* No No No No
*Sold Separately #20985
Brand Mr. Heater
Vent Type Non Vented
Application Residential



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