Good vent-free propane wall heaters include the Mr. Heater 30,000 BTU Propane Blue Flame Vent-Free Heater and ProCom 27 inch Vent-Free Dual Fuel Blue Flame Gas Garage Heater. Both of these products have been well-reviewed by customers, according to Amazon and Home Depot.
The Mr. Heater 30,000 BTU Propane Blue Flame Vent-Free Heater has a majority of 5-star reviews on Amazon. It operates without electricity and is 99.9 percent efficient. It has a built-in oxygen shut-off sensor and thermostat.
The ProCom 27-inch Vent-Free Dual Fuel Blue Flame Gas Garage Heater is a wall-mounted heater which runs on propane gas, according to Home Depot. It has a majority of 3, 4 and 5-star reviews and can heat up to 1,000 square feet. Other good vent-free propane wall heaters include the Cedar Ridge Hearth BTU-30,000 heater, Cedar Ridge Hearth BTU-10,000 heater and HouseWarmer 35,000-BTU Wall-mount heater.