Mr Heater Big Buddy Heater Mh18B 4000-18,000Btu/Hr OS1 WD means this gear is

WD means this gear is designed to keep you in the field and focused on the hunt

an aluminum strainer basket with heat resistant handle and a 5-inch stainless thermometer

There's nothing worse than trying to keep still in a hunting stand when the weather is at it's coldest and wettest

Ultra-bright orange color is easy to track in flight

Mr Heater Big Buddy Heater Mh18B 4000-18,000Btu/Hr OS1 WD means this gear isThe Most Popular Portable Propane Heater in North America. This patented radiant 4,000 18,000 BTU Liquid Propane heater connects directly to two 1 lb. cylinders and is the perfect solution for heating up to 450 sq. ft. Two swivel regulators give you the ability to adapt usage from disposable cylinders to a remote gas supply with the purchase of a single hose and filter. To light the unit, simply push and rotate the knob. The built in Piezo sparking