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All Purpose Natural Gas Building Heater — 40,000 BTU
- Mfg.#
- F272800/MH40NG
- Sku#
- 6390306
- Designed to deliver 40,000 BTU heat output for building use
- Suitable for heating spaces up to 750 sq. ft.
- Designed for low-profile buildings with 12–15 ft ceilings
- Operates without electricity to provide heat during power outages
- Features a Prop 65 warning for exposure to lead and lead compounds
* Estimated stock levels as of Thu, Apr 2, 2026. All items subject to prior sale. Prices may vary between stores and online. Please call ahead to confirm availability of items marked as Limited Stock.
Description
The Mr. Heater All Purpose Natural Gas Building Heater is a 40,000 BTU unit designed to warm large indoor spaces where reliable heat is needed. You’d want this heater when heating workshops, garages, barns, or construction sites that run on natural gas and require consistent, high-output warmth to keep work moving comfortably. Its all-purpose design fits a variety of applications, providing steady heat for chilly mornings, drying out damp areas after plaster or paint work, or keeping equipment and supplies from freezing in colder months. Compact enough to mount where space is limited yet powerful enough to make a noticeable difference, this heater helps maintain a usable environment so tasks stay on schedule and occupants stay comfortable. Backed by the Mr. Heater name, it’s a straightforward solution for building-scale heating needs.
Specifications
General
| BTU | 40000 |
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Manufacturing Details
The following information is subject to change without notice
| Prop 65 Warning |
WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov
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