Under normal operating conditions, a Wallas diesel stove, furnace or oven should not emit any diesel smell. There may be a 30 to 60 second period during startup where the unit will emit some very light gray smoke and faint odor, but once running, they are essentially free of any smell.
These devices are very clean and emit almost insignificant levels of CO, but they are plumbed overboard when properly installed. This allows the unit to change out stale air in the cabin for new, drier, oxygen rich air from outside.
You are more likely to smell diesel from the tank than from a Wallas device. Diesel smell being mostly caused by the presence of sulfur in the fuel means that the new ultra low (>15ppm) sulfur diesel will not have much smell even from the tank as a liquid.
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