In terms of gas usage and heat output? I'm considering either an attic mounted furnace or hanging unit heater for my garage shop. If both heaters are rated at 40k input btu, will they use the same amount of gas to heat the space? 80% furnace and seperated combustion unit heater.

[color=#141414]I have 2 rooms that need supplement heat. I sized and installed all the gas line according to code and pressure tested for leaks. I only have one heater installed now, waiting for other in mail. The room I don't have a heater for I ran the line and capped it.[/color] [color=#141414]When I try to light the heater the pilot goes out as soon as I lift my finger off control knob, pilot will stay on as long as I keep control down. I noticed the pilot flame does not reach the thermocouple causing pilot to go out. I shut off my furnace and tried to light the heater, the pilot was now working properly. I let it run for 20 minutes and then kicked on my furnace, heater then went out.[/color] [color=#141414]I'm wondering if I need to call gas company and have them increase pressure or what may be the issue. I bled the air from heater, furnace, and hot water tank. I didn't bleed the pipe I capped for the other heater I don't have yet, do I still need to crack the cap in order to bleed it even though there's no appliance hooked up? Wondering if maybe air in that line would affect this heaters performance. The heater uses a 630 eurosit. Any input is much appreciated, thanks![/color]