I currently has a propane gas patio heater. Its design allows a massive amount of heat to escape upward instead of being reflected downward due to its use of combustion to produce heat.
I would like to replace the unit with a soffit mounted linear electric heater. You can see a picture of both the current heater and the spot where I would mount under the soffit below:
The gas unit is rated at 42,000 BTU/hr. However, clearly it loses a lot of its heat as convection away from the unit since much of the heat produced is combustion products rather than infrared that is reflected back at me.
What wattage electric model (which presumably is more efficient in producing infrared rather than heating the air) would best replace the existing unit?