# Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater

**Brand:** [Mr. Heater](https://shop.coreranger.com/brands/Mr.%20Heater)
**Price:** $452.79–$934.23 · in stock
**URL:** https://shop.coreranger.com/product/mr-heater-125-000-btu-big-maxx-natural-gas-unit-heater-328549216

## Options

- **Color:** Black, Gray
- **Heat rating (BTU/hour):** 125000, 50000, 80000
- **Product Weight (lb.):** 108.93, 59.08, 87.6

## Variants

| Variant | SKU | Price | Stock |
|---|---|---|---|
| Gray / 50000 / 59.08 | MHU50NG | $452.79 | in stock |
| Black / 80000 / 87.6 | MHU80NG | $549.99 | in stock |
| Black / 125000 / 108.93 | MHU125NG | $934.23 | in stock |

## Specifications

| Spec | Value |
|---|---|
| Color | Black |
| Features | Adjustable Thermostat |
| Pack Size | 1 |
| Room Size | Extra Large |
| Vent Type | Ventless |
| Returnable | 90-Day |
| Heater Type | Vented |
| Color Family | Black |
| Control Type | Mechanical |
| Location Use | Garage |
| Ignition Type | Electrical |
| Heating Method | Forced Air |
| Indoor/Outdoor | Indoor,Outdoor |
| Power/Fuel Type | Natural Gas |
| Runtime (hours) | 0 hr |
| Product Depth (in.) | 26.50 in |
| Product Width (in.) | 27 in |
| Product Weight (lb.) | 108.93 lb |
| Area Heated (sq. ft.) | 5000 sq ft |
| Manufacturer Warranty | 3 Years parts, 10 year Heat Exchanger |
| Heat rating (BTU/hour) | 125000 Btu/h |
| Number of Heat Settings | 1 |
| Fuel Rate (gallons/hour) | 0 gal (US)/min |
| Portable Heater Features | Thermostat |
| Fuel Tank Capacity (gal.) | 0 gal |
| Certifications and Listings | CSA Certified |
| Maximum Temperature Setting (F) | 0 °F |

## Description

The Mr. Heater Big Maxx 125,000 BTU unit heater will turn your garage or barn into a work space you can use all year round. Uses a built-in high-velocity electric fan to pull cool air in and across the heat exchanger, then forcing warm, comfortable air out. Its low profile design requires only a 15 ft. minimum ceiling height and 1 in. mounting clearance. Features a high-temperature safety shut-off, gas safety shut-off flame sensor, and an electric spark ignition with a self-diagnostic control module, to bring you peace of mind and years of comfortable, safe heat. Comes as natural gas and includes a propane conversion kit and ceiling mounting brackets. Requires 120-Volt AC power and can be vented vertically or horizontally - please check local codes and restrictions. This heater offers all the operating versatility and safety you have come to expect from Mr. Heater.

• Indoor 125,000 BTU forced air propane or natural gas unit heater
• Forced air propane or natural gas heater heats up 5,000 sq. ft.
• Ceiling mounted forced air unit heater for garages, barns, etc.