What heater to use for ice shelter?

[Troll]

I have the older style Mr. Heater. (same company that makes the Buddies). It is not certified for indoor use, but my tent has lots of ventilation.
I have done a few modifications to it so that it runs on 1lb tanks and sits flat. That way i can cook breakfast in the shack.

The heater keeps it plenty warm. The kid in back with no coat is also wet up to his waist. A couple hours after this picture he was dry.
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