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I have used those for years, never had one fail, and always pretty consistent Performance. I have a few in the drawer removed from project upgrades and intercepted before they reached the dumpster, saved for future use:)

Yea, the manufacture may have a specified duty cycle, but duty cycles are usually imposed because of an inability to dissipate heat. I would guess if this unit can maintain a steady temp when operating, it probably has no duty cycle...

That doesn’t sound right. I would hope there is no way for combustion gas to enter the airstream. But a fuel leak before the combustion chamber might allow fuel to come in contact with the burn chamber or heat exchanger and get heated enough to generate smoke/vapors which are being drawn into...

Wow, an honest 3-1/4” in the floor, I wonder whats in the ceiling? that extra insul in the floor only saves you about 300 BTU/hr at the above temps...

Thats a lot of heat! An 8x8x12 structure has 512 sq/ft of surface area. If it had 2“ of insulation it might make R10? At 70F inside and say -20 outside, crunching some numbers with say 24SQ/ft of R2 windows and one air change per hour, that is around 7000 BTU/hr required to maintain 70F...