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Mr. Heater Big Buddy Pro 18,000 BTU Radiant Heater, 450 ft² Capacity, Model# MH18B

Item# 5347409
Mr. Heater Big Buddy Pro 18,000 BTU Radiant Heater, 450 ft² Capacity, Model# MH18B

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Mr. Heater Big Buddy Pro 18,000 BTU Radiant Heater, 450 ft² Capacity, Model# MH18B

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$159.99

  • Shipping: 

    Backordered: Order now to reserve yours -
    Estimated to ship 11/20/26

  • Store Pickup: 

    Not Available
  • Powerful 18,000 BTU Heating: Choose from low, medium, or high settings delivering 4,000, 9,000, or 18,000 BTU/hr. to dial in the right level of warmth for changing temperatures and environments.
  • Heats Up To 400 Sq. Ft.: Designed to warm spaces up to approximately 400 sq. ft., making it a versatile heating solution for campsites, ice houses, garages, workshops, decks, and other indoor or outdoor spaces where approved for use.
  • Dual Heating System: Combines the direct comfort of radiant heat with convection airflow for effective heating, while the built-in high-powered fan helps improve warm-air circulation throughout the surrounding area.
  • Built-in high-powered fan: Helps circulate warmth throughout the space while keeping noise levels to a minimum.
  • Flexible Propane Connections: Swivel regulators help simplify setup and allow the heater to connect directly to two 1-lb. disposable propane cylinders. For extended operation, connect to a 20-lb. propane cylinder using an optional compatible hose and filter.

  • Prop 65 Warning: See Details

See full description

Complete Your Solution

  • Mr. Heater Big Buddy Pro 18,000 BTU Radiant Heater, 450 ft² Capacity, Model# MH18B
  • Mr. Heater Hose Connection For Buddy Heater Item# 173690, 5ft. Length, Model# F273701
  • Mr. Heater 12ft.L Hose Connection for Use with Mr. Heater Fuel Filter Item# 173639
  • Mr. Heater Fuel Filter for Buddy Heaters, Model# F273699
Price for all four:

$227.96

Frequently Bought Together

  • Description

  • Key Specs

  • Reviews

  • Q & A

  • Accessories

  • Warranty

  • Compare

Product Summary

Take on cold campsites, ice houses, workshops, garages, decks, and other chilly spaces with the Mr. Heater Big Buddy Pro MH18B Radiant Propane Heater. Delivering three selectable heat outputs of 4,000, 9,000, or 18,000 BTU per hour, this versatile heater provides powerful, adjustable warmth for spaces up to approximately 400 sq. ft. Its dual heating system combines comfortable radiant heat with convection airflow, while the built-in high-powered fan helps circulate warmth throughout the space. Electronic ignition makes startup convenient, and flexible fuel connections let you use two 1-lb. propane cylinders or connect to a 20-lb. cylinder with the appropriate optional hose and filter. Multiple integrated safety features provide added confidence for recreational and professional use.

What's Included

    (1) Heater (1) Owners Manual

Downloads

Product Manual

Features + Benefits

  • Powerful 18,000 BTU Heating: Choose from low, medium, or high settings delivering 4,000, 9,000, or 18,000 BTU/hr. to dial in the right level of warmth for changing temperatures and environments.
  • Heats Up To 400 Sq. Ft.: Designed to warm spaces up to approximately 400 sq. ft., making it a versatile heating solution for campsites, ice houses, garages, workshops, decks, and other indoor or outdoor spaces where approved for use.
  • Dual Heating System: Combines the direct comfort of radiant heat with convection airflow for effective heating, while the built-in high-powered fan helps improve warm-air circulation throughout the surrounding area.
  • Built-in high-powered fan: Helps circulate warmth throughout the space while keeping noise levels to a minimum.
  • Flexible Propane Connections: Swivel regulators help simplify setup and allow the heater to connect directly to two 1-lb. disposable propane cylinders. For extended operation, connect to a 20-lb. propane cylinder using an optional compatible hose and filter.
  • Built-In Safety Features: The integrated Life Safety System includes an oxygen depletion sensor, accidental tip-over switch, and thermal shut-down system for added protection during operation. The heater is also constructed with self-extinguishing materials and is CSA Certified.
  • Convenient Electronic Ignition: Electronic ignition provides quick, convenient startup, with the required battery included. The heater is designed to deliver clean-burning, odor-free propane heat without hardwiring or a power cord.
  • Extended Propane Runtime: Provides approximately 10.8 hours of runtime on low, 4.8 hours on medium, or 2.4 hours on high, giving you flexible heating performance based on your comfort needs.
  • Portable, Versatile Design: Measuring approximately 11 x 17.5 x 17 in. and weighing 13.5 lbs., the Big Buddy Pro offers substantial heating power in a portable design suited for both recreational and professional applications.
  • CSA Certified: CSA certification complements the heater's integrated safety features for added confidence during operation.
  • 3-Year Warranty: Backed by a 3-year warranty. Maximum operating elevation is 7,000 ft. Not for sale in Massachusetts or Canada.

Key Specs

AttributeSpecification

item#

5347409

Brand

Mr. Heater

Manufacturer's Warranty

3 year limited warranty

Ship Weight

16.05 LB

Heat Type

Radiant

Heat Output

18,000 Btu/hour

Heating Capability

400 ft²

Hardwired

No

Indoor-Outdoor Use

Indoor

Assembled Width

17.5 in

Assembled Height

17 in
AttributeSpecification

Assembled Depth

11 in

Needs Direct Venting

No

Power Cord Length

0 ft

Remote Included

No

Heat Settings

3

Regulator Included

Yes

Tip-Over Safety Switch

Yes

Blower Included

Yes

Oscillating

No

Product Weight

13.5000 lb

Dimensions L x W x H (in.)

11.0 x 17.5 x 17.0 in

Reviews

Questions & Answers

207 Reviews This action will navigate to reviews.

Questions

1–10 of 23 Questions  
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  1. Does it have a battery operated fan

    1. Yes, 4 D batteries.

      Helpful?

    2. Thank you for your inquiry. Yes, this version of the Big Buddy has a fan. Have a great day!

      Helpful?

    3. The heater will come with a battery operated fan. It will require (4) D batteries.

      Helpful?

  2. Is it solar

    1. This heater is not solar powered. This is a Propane heater.

      Helpful?

    2. Thank you for your inquiry. No, this heater doesn't have any sort of solar power. Have a great day!

      Helpful?

  3. Do it comes with tank to heat with 

    1. Thank you for your inquiry. No, this heater does not come with propane. Have a great day!

      Helpful?

    2. The heater does not include the propane cylinders or propane tank needed to operate.

      Helpful?

  4. Can it work without electricity

    1. This heater does not require any power to operate.

      Helpful?

    2. Thank you for your inquiry. This heater does not require any power to operate. Have a great day!

      Helpful?

  5. Can ii be use in a room at home

    1. This heater is safe for indoor use.

      Helpful?

    2. Thank you for your inquiry. Yes, heater is safe for indoor use. Have a great day!

      Helpful?

  6. How many cfm is the fan

    1. The Mr. Heater Big Buddy Pro Heater will operate at 10 CFM.

      Helpful?

    2. Thank you for your inquiry. The fan on this heater will run at about 10 cfm. Have a great day!

      Helpful?

  7. The MH18B is advertised as having electronic ignition. Your table of comparisons however show piezo electric ignition. Which is correct?

    1 answer

    1. This heater features electronic ignition and includes an AA battery to power it.

      Helpful?

  8. Can this be used in an apartment with kids  and does it have a smell

    1 answer

    1. This heater can be used indoors, including in an apartment. There may be a small propane smell during startup and shutdown, but there should not be a strong smell during operation.

      Helpful?

  9. What comes in the box and we need to purchase anything for it work straight out the box

    1 answer

    1. This is the heater only. The heater does not include the hose, filter or tank needed to run the heater.

      Helpful?

  10. Is it okay to put this heater in a enclosed space

    1 answer

    1. This heater can be used in an enclosed space without ventilation. The heater will shut itself down before any danger will occur.

      Helpful?

Accessories We Recommend

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See All Hose Assemblies + Regulators
Mr. Heater Fuel Filter for Buddy Heaters, Model# F273699
4.5 out of 5 stars. 102 reviews

Mr. Heater Fuel Filter for Buddy Heaters, Model# F273699

Item # 173639

$12.99

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 Buddy Pro 18,000 BTU Radiant Heater, 450 ft² Capacity, Model# MH18B
4.8 out of 5 stars. 207 reviews

Mr. Heater Big Buddy Pro 18,000 BTU Radiant Heater, 450 ft² Capacity, Model# MH18B

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