Mr. Heater 18,000 BTU Portable Propane Heater MH18B

The Mr. Heater Big Buddy PRO Series portable propane heater delivers reliable warmth for both indoor and outdoor spaces, producing up to 18,000 BTU of heat output to cover areas up to 450 sq ft. Featuring a dual heating system that blends radiant warmth with convection airflow and a built-in high-powered fan, it offers three adjustable heat settings at 4,000, 9,000, and 18,000 BTU to suit varying conditions.

Equipped with dual swivel regulators, this versatile heater connects easily to two 1 lb propane cylinders or to a 20 lb tank using compatible Buddy hose accessories. An integrated Life Safety System includes an oxygen depletion sensor, thermal shut-down system, and tip-over switch to ensure secure, dependable operation during cold-weather excursions, workshops, or emergency backup heating.

Key Features

Highlights

• Heats up to 450 square feet
• Low, Medium, and High heat settings: 4,000 / 9,000 / 18,000 BTU
• Heats up to 216 hrs. on two 20lb Propane tanks with optional hose (low setting)
• Big Buddy dual heating system combines radiant heat comfort with convection heat air flow
• Built-in high powered fan
• The use of un-authorized accessories/attachments with this heater are expressly prohibited, may cause serious injury, and will void the warranty.

Videos

Compatibility

Compatible with standard 1 lb propane cylinders and 20 lb propane tanks when using official Buddy connection accessories and hoses.

How to use

Attach two 1 lb propane cylinders to the swivel regulators or connect an authorized Buddy hose accessory to a larger 20 lb propane tank. Select between Low (4,000 BTU), Medium (9,000 BTU), or High (18,000 BTU) heat settings to operate the dual radiant and convection heating system with the integrated fan.

Warranty

Downloads

• User Manual (PDF)