Replace the Nozzel of the burners.
SOURCE: Natural Gas wall heater
It could be either the thermostat or thermocouple is not getting correct voltage so will intermittent turn on and off.
SOURCE: B vent configuration of direct vent propane heaters
Yes, the design of the combustion chamber is limited at how much fresh air and combustion air can enter it. If you lengthen the venting, you will be causing more restriction and there will not be enough natural air movement to make it work. It will start, run for a minute or two and poof out. Not to mention you will be circumventing it's UL rating and if you sell your home with it installed, you are liable for any fatality or damage. Do you want to risk that? Don't even think of doing it! There are "Box" heaters out there sized from about 5,000 Btu's on up to 100,000 Btu's. Check the web.
SOURCE: Natural Gas wall heater
It sounds like the thermocoupler is either not adjusted into the flame properly, or you may have gotten a bad one. The thermocouple is the main thing that makes the pilot work.
SOURCE: I have a Rinnai 506 silent servant vent free
yes you can, but is complicated, involves changing injector, burner, and reprogramming the PCB for the new gas type. Get a pro to do it for you
SOURCE: Comfort Glow Vent-free Gas Heater
I have a comfort glow gas heater that the pilot lights and when I start the heater it works for about 30 seconds then the whole thing shuts down.
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