Hero image 0 of Mr. Heater 50,000 BTU Big Maxx Natural Gas Unit Heater with Natural Gas to Liquid Propane Conversion Kit, 0 of 10

Mr. Heater

Mr. Heater 50,000 BTU Big Maxx Natural Gas Unit Heater with Natural Gas to Liquid Propane Conversion Kit

Name: Mr. Heater 50,000 BTU Big Maxx Natural Gas Unit Heater with Natural Gas to Liquid Propane Conversion Kit
Brand: Mr. Heater
SKU: 37902470
Price: 619.35 USD
Availability: InStock
Rating: 4.2 (26 reviews)

4.2 stars out of 26 reviews

(4.2)|

26 ratings

Mr. Heater 50,000 BTU Big Maxx Natural Gas Unit Heater with Natural Gas to Liquid Propane Conversion Kit Mr Heater 50 000 BTU Big Maxx Natural Gas Unit Heater with Natural Gas to Liquid Propane Conversion Kit

Size:24" x 25.5" x 13"

Key item features

Powerful Heating: Natural gas heater with 50,000 BTU output, ideal for heating up to 1,667 square feet in garages, barns, or workspaces.
Versatile Operation: Self-diagnostic control module allows for precise temperature settings and versatile operation.
Quiet Performance: High-velocity fan operates quietly, pulling cool air over the heat exchanger and distributing warm air efficiently.
Easy Installation: Includes mounting brackets, external power access, and thermostat connections for straightforward installation.
Safety Features: Equipped with a heat safety limit shutoff to prevent potential accidents.
Dual Fuel Capability: Can operate on natural gas or propane, with a conversion kit included for flexibility.
Compact Design: Dimensions of 14.87 x 29 x 26 inches and a weight of 70 pounds, requiring a minimum 8-foot clearance from the floor.
WiFi Compatible: Accepts WiFi thermostats for modern, convenient temperature control.

Generated by AI

Specs

Space heater type
Garage Heaters
Power type
Gas
Maximum room size
1667 sq ft
Rec. use
Indoor
Features
Automatic Shutoff
Number of heat settings
1

Price when purchased online

Walmart Protection Plan by Allstate

(Only one option can be selected at a time)

3-Year Plan - $59.00

4-Year Plan - $77.00

Report an issue with this seller

More seller options (1)

Starting from $619.35

Similar items you might like

Based on what customers bought

Mr. Heater 80,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit $614.15 Was $767.25
current price $614.15, Was $767.25
Mr. Heater 80,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit
3.7 out of 5 Stars. 3 reviews
Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit $934.23
Options
current price $934.23
Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit
4.7 out of 5 Stars. 105 reviews
Ashley Hearth Products New 11,000 BTU Direct Vent Propane Wall Mount Heater $389.99 $389.99/count
current price $389.99
$389.99/count
Ashley Hearth Products New 11,000 BTU Direct Vent Propane Wall Mount Heater
4.5 out of 5 Stars. 31 reviews
17,000 Btu Direct Vent Propane Heater $559.99
current price $559.99
17,000 Btu Direct Vent Propane Heater
4.3 out of 5 Stars. 36 reviews
30,000 BTU Vent Free Radiant Heater, White $349.99
Available in additional 2 options
Options
current price $349.99
30,000 BTU Vent Free Radiant Heater, White
4.5 out of 5 Stars. 584 reviews
Comfort Zone Infrared Tower Heater, 1500W, Thermostat, 2 Settings $59.73
current price $59.73
Comfort Zone Infrared Tower Heater, 1500W, Thermostat, 2 Settings
4 out of 5 Stars. 495 reviews
Master MH-80TBOA-KFA 80000 BTU Kerosene/Diesel Cordless and Corded Portable Forced Air Heater with Thermostat (Tool Only) $399.99
current price $399.99
Master MH-80TBOA-KFA 80000 BTU Kerosene/Diesel Cordless and Corded Portable Forced Air Heater with Thermostat (Tool Only)
11,000 Btu Direct Vent Natural Gas Heater $399.99
current price $399.99
11,000 Btu Direct Vent Natural Gas Heater
4.3 out of 5 Stars. 3 reviews
REDDY HEATER 135,000-BTU Kerosene/Multi-Fuel Indoor/Outdoor Forced-Air Heater with Thermostat and Flat-Free Wheels, RFA135C, RFA135C $439.04
current price $439.04
REDDY HEATER 135,000-BTU Kerosene/Multi-Fuel Indoor/Outdoor Forced-Air Heater with Thermostat and Flat-Free Wheels, RFA135C, RFA135C
5 out of 5 Stars. 1 reviews
Empire Infrared Heater Natural Gas 18000 BTU, Manual Control 3 Settings $599.34
current price $599.34
Empire Infrared Heater Natural Gas 18000 BTU, Manual Control 3 Settings
Heatstar Hs170Qfavt 170,000 Btu Propane Forced Air Heater With Hose $359.99
current price $359.99
Heatstar Hs170Qfavt 170,000 Btu Propane Forced Air Heater With Hose
Heatstar Hs35Fa 115V 3A 35000 Btu Propane Forced Air Heater $129.99
current price $129.99
Heatstar Hs35Fa 115V 3A 35000 Btu Propane Forced Air Heater
150000 BTU Propane LP Variable Output Portable Gas Forced Air Heater $282.45
current price $282.45
150000 BTU Propane LP Variable Output Portable Gas Forced Air Heater
Portable 35cm for LPG Gas Room Heater with Flat 4.8mm Terminal $13.49
current price $13.49
Portable 35cm for LPG Gas Room Heater with Flat 4.8mm Terminal

About this item

Product details

Keep your workshop working even in the cold months with the Big Maxx 50,000 heater. The heater uses the power of convection heating to pump out 50,000 BTU of comfort. A heating area of 1,667 square feet will blanket your barn or garage as the industrial fan spreads the warmth. The Big Maxx comes with angle brackets for simple installation where you need the heat. And a clearance requirement of eight feet below and one inch above mean it can fit almost anywhere. Keep doing your work and let the Big Maxx keep you warm. Requires 120-Volt AC power and can be vented vertically or horizontally - please check local codes and restrictions.

Natural gas heater allows you to use your garage, barn, or workspace even in the coldest months; heats up to 1,667 square feet
Self-diagnostic control module allows you to set your temperature for versatile operation
Quiet, high-velocity fan pulls cool air over the heat exchanger and forces warm air into the surrounding area with little noise
Uses 115-volt AC power and can be vented vertically or horizontally
Includes mounting brackets, external access to power, and thermostat connections to make installation a breeze
Includes heat safety limit shutoff to stop potential accidents
Fuel type: Natural Gas or Propane
Heat type: Forced Air
Maximum BTU output: 50,000 BTUs per hour
Heats up to 1,667 square feet
Accepts WiFi thermostats
Minimum 8-foot clearance from floor to base of heater required
0.50 inch gas line connection
Category 1 vertical, category 3 horizontal venting
Natural gas to liquid propane conversion kit also included
Thermostat sold separately
Color: Gray
Dimensions (L x W x H): 14.87 x 29 x 26 inches
Weight: 70 pounds
Manufacturer warranty: 1-year warranty

info:

We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.

Specifications

Fuel type

Natural Gas, Liquid Propane

Space heater type

Garage Heaters

Power type

Gas

Maximum room size

1667 sq ft

Warranty

Warranty information

1 year limited

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.

Warranty url

https://www.mrheater.com/warranty-registration

Warnings

Warning Text

proposition 65 reasons:titanium dioxide, other chemicals

WARNING: Chemical: Lead and lead compounds

Customer ratings & reviews

4.2 out of 5 stars

stars26 ratings12 reviews

How item rating is calculated

Customer photos

Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.

Sort by |

Showing 1-3 of 12 reviews

Aug 25, 2025

Mary

Item details

Size: 24" x 25.5" x 13"

Sold and shipped byNorthern Tool + Equipment

5 out of 5 stars review

Verified Purchase

liked it .. will serve my needs .. just wish the ventilation kit had been included with it . Now have to order it separate.

Incentivized Review

Helpful?

Mar 17, 2026

tim

Item details

Size: 24" x 25.5" x 13"

5 out of 5 stars review

Verified Purchase

Big heater

Awesome machine warms my shop nice

Incentivized Review

Helpful?

Dec 14, 2025

Courtney

Item details

Size: 24" x 25.5" x 13"

Sold and shipped byNorthern Tool + Equipment

5 out of 5 stars review

Verified Purchase

Didn't come with anything to hook it up with. Overall it heats fast and well

Incentivized Review

Helpful?

Rewards debit card.Earn 3% cash back, on up to $150spent each month.Terms apply.

Join OnePay Cash

Rollbacks & more

Mother's Day

Grocery

Clothing, Shoes, & Accessories

Baby & Kids

Pharmacy, Health & Wellness

Home, Garden & Tools

Electronics

Gaming

Auto & Tires

Personal Care

Beauty

Toys & Outdoor Play

Household Essentials

Pet Supplies

School, Office & Art Supplies

Sports & Outdoors

Books, Movies, & Music

Party Supplies

Auto Care Services

Pharmacy

Health Services

Vaccines

Vision Center

Benefit Programs

Insurance Services

Lists

Registries

Gift Cards

Spark Good

Custom Cakes

Custom Cupcakes

Featured

Photo Gifts

OnePay Hub

Money & Other Services

Gift Cards

Protection Services

Home & Tech Services

Subscriptions

Subscription Products

Walmart Business

Industry solutions

It’s easier in the app

Pickup & Delivery

Get inspired

Mr. Heater 50,000 BTU Big Maxx Natural Gas Unit Heater with Natural Gas to Liquid Propane Conversion Kit

Key item features

Specs

More seller options (1)

Similar items you might like

Based on what customers bought

Mr. Heater 80,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit $614.15 Was $767.25

Mr. Heater 80,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit

Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit $934.23

Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit

Ashley Hearth Products New 11,000 BTU Direct Vent Propane Wall Mount Heater $389.99 $389.99/count

Ashley Hearth Products New 11,000 BTU Direct Vent Propane Wall Mount Heater

17,000 Btu Direct Vent Propane Heater $559.99

17,000 Btu Direct Vent Propane Heater

30,000 BTU Vent Free Radiant Heater, White $349.99

30,000 BTU Vent Free Radiant Heater, White

Comfort Zone Infrared Tower Heater, 1500W, Thermostat, 2 Settings $59.73

Comfort Zone Infrared Tower Heater, 1500W, Thermostat, 2 Settings

Master MH-80TBOA-KFA 80000 BTU Kerosene/Diesel Cordless and Corded Portable Forced Air Heater with Thermostat (Tool Only) $399.99

Master MH-80TBOA-KFA 80000 BTU Kerosene/Diesel Cordless and Corded Portable Forced Air Heater with Thermostat (Tool Only)

11,000 Btu Direct Vent Natural Gas Heater $399.99

11,000 Btu Direct Vent Natural Gas Heater

REDDY HEATER 135,000-BTU Kerosene/Multi-Fuel Indoor/Outdoor Forced-Air Heater with Thermostat and Flat-Free Wheels, RFA135C, RFA135C $439.04

REDDY HEATER 135,000-BTU Kerosene/Multi-Fuel Indoor/Outdoor Forced-Air Heater with Thermostat and Flat-Free Wheels, RFA135C, RFA135C

Empire Infrared Heater Natural Gas 18000 BTU, Manual Control 3 Settings $599.34

Empire Infrared Heater Natural Gas 18000 BTU, Manual Control 3 Settings

Heatstar Hs170Qfavt 170,000 Btu Propane Forced Air Heater With Hose $359.99

Heatstar Hs170Qfavt 170,000 Btu Propane Forced Air Heater With Hose

Heatstar Hs35Fa 115V 3A 35000 Btu Propane Forced Air Heater $129.99

Heatstar Hs35Fa 115V 3A 35000 Btu Propane Forced Air Heater

150000 BTU Propane LP Variable Output Portable Gas Forced Air Heater $282.45

150000 BTU Propane LP Variable Output Portable Gas Forced Air Heater

Portable 35cm for LPG Gas Room Heater with Flat 4.8mm Terminal $13.49

Portable 35cm for LPG Gas Room Heater with Flat 4.8mm Terminal