Amazon.com: Martin Direct Vent Propane Wall Furnace Heater for Indoor Homes or Offices with Built-in Thermostat and Glass Panel, 20,000 BTU : Tools & Home Improvement
Dyna-Glo 30,000 BTU Vent Free Infrared Liquid Propane Thermostatic Wall Heater IRSS30LPT-2P - The Home Depot
Dyna-Glo 18000-BTU Wall-Mount Indoor Liquid Propane Vent-Free Radiant Heater in the Gas Space Heaters department at Lowes.com
MHVFRD30LPT Vent Free Radiant Propane Heater | Mr. Heater