Wall outlets are usually in garages, which are indoor/outdoor areas, kept with lots of microbial growth.
Maybe the engineers wanted to ensure your cabin wouldn’t induce health risks.
The real answer is probably that the heater pulls sufficient amps to slow down their already abysmally slow charge (relative to competition),
and they didn’t want to include the variance.
The real answer is probably that the heater pulls sufficient amps to slow down their already abysmally slow charge (relative to competition),
and they didn’t want to include the variance.