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Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, 50,000 BTU, LP Conversion Kit, Model# F260550

Item# 27457
"Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, 50,000 BTU, LP Conversion Kit, Model# F260550"
Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, 50,000 BTU, LP Conversion Kit, Model# F260550

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Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, 50,000 BTU, LP Conversion Kit, Model# F260550

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$499.99

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  • Power exhaust allows for vertical or horizontal venting
  • Designed for right or left side piping, electrical and flue connections by simply rotating 180°
  • Tubular heat exchanger and spark ignition 3 Amp draw
  • Horizontal venting kit, Item# 29794, and vertical venting kit sold separately
  • Thermostat sold separately -- Item# 173641

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  • Description

  • Key Specs

  • Reviews

  • Q & A

  • Accessories

  • Warranty

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Product Summary

This Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater is quiet and vented for easily heating a 2- to 3-car garage. The low-profile design requires only 1in. clearance from ceiling. Includes LP conversion kit for easy change over. Two angle brackets allow for positioning heater up and out of the way. Works with thermostat, Item# 173641 (sold separately). Note: Installation requires an 8ft. clearance from the floor and will not pass code with less than 8ft.

What's Included

    (1) Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, Model# F260550, (1) LP conversion kit

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Product Manual

Features + Benefits

  • Power exhaust allows for vertical or horizontal venting
  • Designed for right or left side piping, electrical and flue connections by simply rotating 180°
  • Tubular heat exchanger and spark ignition 3 Amp draw
  • Horizontal venting kit, Item# 29794, and vertical venting kit sold separately
  • Thermostat sold separately -- Item# 173641
  • Includes LP conversion kit
  • Note: Due to BTU loss through exhaust gases, heater runs at approx. 81% operating efficiency.
  • Note: Installation requires an 8ft. clearance from the floor and will not pass code with less than 8ft.
  • Note: Check local codes and ordinances for further approved installation and usage. See product manual for venting and electrical supply requirements.

Key Specs

AttributeSpecification

item#

27457

Brand

Mr. Heater

Manufacturer's Warranty

3 year limited warranty

Ship Weight

68.6 LB

Heat Output

50,000 Btu/hour

Heat Type

Forced Air

Heating Capability

1,667 ft²
AttributeSpecification

Needs Direct Venting

Yes

Blower Included

Yes

Blower CFM

550 cfm

Thermostat Included

No

Volts

120

Product Weight

59.0800 lb

Dimensions L x W x H (in.)

24.0 x 25.5 x 13.0 in

Reviews

Questions & Answers

582 Reviews This action will navigate to reviews.

Questions

1–10 of 103 Questions  
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  1. Does this unit have a pilot light? I want to run only when needed, would I have to re-light each time of use?

    1. No they are electronic ignition

      Helpful?

    2. No. It has electronic spark ignition which is the best kind on the market today. It's the way to go. This is a very high tech, but simple unit.

      Helpful?

    3. Thank you for your inquiry. This unit does not have a pilot light. You will not need to reignite it due to there being an internal spark ignition.

      Helpful?

    4. The MHU series unit heaters use a direct spark ignition system. There is no pilot necessary as the spark lights the main burner as the gas valve is turned on.

      Helpful?

  2. How loud is this unit in a 28x28 foot building?

    1. This unit is kinda loud - it has two fans (1 exhaust and 1 blower fan) and you can hear and feel the unit inside the house while it is running. I have been thinking about adding some rubber gaskets to add some dampening effect for the unit.  I have a 2 1/2 car garage and it heats nicely, but it not like a regular electric heater which are very quiet - you can definitely tell it’s up there and running.

      Helpful?

    2. Surprisingly quiet. It works just like a HVAC unit for in a house. When it is off it is perfectly quiet. When it starts up you hear the combustion fan (very quiet) then when the heat is high enough the recirculation fan (a little louder). The fan is pretty small and quiet. You could stand below it and have a normal conversation without having to raise your voice.

      Helpful?

    3. I installed the 50KBtu, and I'm very pleased with the sound level. I mounted mine rigid to the open ceiling truss' to dampen vibrations.

      Helpful?

    4. A decibel rating is currently not available for this Mr. Heater Big Maxx Natural Gas Garage/Workshop Heater.

      Helpful?

  3. Will this unit work with a digital programable thermostat?

    1. yes

      Helpful?

    2. Yes. I am using one on mine. The heat mode controls this unit, and the cooling mode controls attic exhaust.

      Helpful?

    3. The item # 27457 can be used with a digital, programmable 24 volt thermostat. You would use the standard red and white wire connections for the thermostat and then also use the green wire connection for the digital.

      Helpful?

  4. Can this unit be mounted directly to the ceiling (drywall) or do I have to hang it from throughbolts to allow an air gap?

    1. You need clearance, air gap. The minimum air gap clearances are in the manual that comes with the unit. You also can get them online here within Northern Tool.

      Helpful?

    2. This unit does requires a 1" clearance for mounting from the ceiling.

      Helpful?

    3. The unit is not recommended to be mounted directly to the ceiling. I can be mounting using chains, rods, bars, or a shelf.

      Helpful?

  5. What gage wire do you need

    1. A 20 amp breaker would require a 12 or 10 gauge wire.

      Helpful?

    2. For a 20 amp supply and breaker, you have to use no smaller than 12/2 wire. White 14/2 wire cannot be connected to a 20 amp breaker per NEC. 

      Helpful?

  6. What is the purpose of the A/C Terminals?

    Is there a cooling coil to connect a A/C condensing unit and provide cooling as well as heating?

    1. No it is strictly heat only

      Helpful?

    2. This heater has electrical connections for the blower and for the thermostat.
      This unit is not an air conditioner and does not have air conditioner cooling coils.

      Helpful?

  7. Big max 50,000 btu heater. what is the recommended sq ft garage for this unit

    1. 1250

      I have a 2.5 car garage with 10ft ceiling. Heats it very well

      Helpful?

    2. This heater is recommended for a garage with up to 1,250 square feet in size.

      Helpful?

  8. Inverted Mounting?

    has anyone mounted this unit in the inverted 180 degree position outlined in the user guide? I don't want to run the vent directly behind the intake fan/blower and believe that inverting it will allow the vent to come out from the (now) left side of the unit with the fan on the (now) right side. Besides having all the nameplates upside down is there any other issues?

    1. Yes. Simple to turn it over and install. It even came with a label to correct the upside down label.

      Helpful?

    2. When installing in the 180° inverted position, the fan housing would be at the bottom of the unit. Please check you local codes and ordinance before installing to ensure this type of instal is allowed in your area.

      Helpful?

  9. Which unit 50 or 80k btu for a 1000 sq ft garage?

    My garage is two car, pretty well insulated, and just under 1000 sq ft. Is there an advantage to going with the 80k btu unit? Which would be more efficient to keep it around 60 degrees?

    1. Thank you for your inquiry. The 80K BTU unit would turn on and off and run for short periods of time, but the 50K unit would run for a longer period of time to heat up the garage. The 50K is recommended for 1000 square feet, but an 80K can work.

      Helpful?

    2. The 50K BTU Maxx heater would be recommended for a 1000 square foot garage.

      Helpful?

  10. LP Gas conversion

    How difficult is it to convert this unit to LP gas safely?

    1. It was real simple. They include the conversion kit.

      Helpful?

    2. It is very simple to convert this heater to LP. You would just take a flat head screw driver and remove the spring from the gas valve and replace it with the LP spring.

      Helpful?

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Warranty

Manufacturer's Warranty

3 year limited warranty

Extend Your Warranty Coverage with a Northern Protection Plan (NPP)

Replacement Plan — 1 Year

A Northern Protection Plan is available after adding the product to your shopping cart.

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Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, 50,000 BTU, LP Conversion Kit, Model# F260550
4.7 out of 5 stars. 582 reviews

Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater, 50,000 BTU, LP Conversion Kit, Model# F260550

Item # 27457

$499.99