The Williams Comfort Products 4505621A Propane Floor Furnace has an input of 45,000BTU.  The compatible conversion kits are  8953 (Natural to Propane) and 8955 (Propane to Natural Gas).

Williams' Floor Furnaces are equipped with an automatic floor register grille temperature control. This meets the latest American National Standards Institute Requirements. In extreme weather conditions, this control may be overridden to allow increased heat output

FEATURES:

• No electricity required.
• “Matchless” pilot igniter
• Easy Installation
• Natural and propane models (conversion kits available)
• Combustion chamber lifts out for easy service
• Long-life and quiet heavy-duty burner
• Automatic temperature and safety controls
• Resettable vent-limit safety switch