I don't have electricity to my greenhouses and just can't get it there from the house so last year I used a Mr. Heater Big Buddy propane heater. It worked pretty good but his year I'll have a lot of orchids in one of the greenhouses. I plan on getting a generator/inverter to set between the two to run some box fans for warm air circulation and also adding some lights for evening work. Last year I ran it on low with two 15lb tanks and it would heat ok but not everywhere and I lost a few plants. Does anyone have suggestions for possibly another brand heater that would work with the two 15lb tanks or even a 20 or 40lb. Here are the specs on the one I have. My greenhouses are 10 x 13 or 130sqft. The built in fan didn't run too long on batteries so I'll more than likely order the AC adapter if I keep the Big Buddy.
The 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 enclosed spaces like cabins up to 400 sq. ft. An integrated fan increases the heating capacity of this unit, blending radiant and convection style heat to give you the best of both worlds. 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 mechanism will take care of the rest. With the Oxygen Depletion Sensor (ODS) and accidental tip-over safety shut-off, you can be sure that you will enjoy years of comfortable indoor safe heat.
4,000, 9,000, or 18,000 BTU per hour
For use with propane gas
Heats up to 400 sq. ft.
Single control start knob
Hi-Med-Low heat settings
Automatic low oxygen shut-off system (ODS)
Accidental tip-over safety shut-off
Connects to two 1 lb. cylinders
Connects to a 20 lb. cylinder with optional hose
Fan operates on 4 - D batteries or AC adapter, both sold separately