What is Reddit's opinion of Comfort Zone CZ8008 1,500-Watt Electric Oil-Filled Radiant Radiator Heater, Permanently Sealed, Never Refill, Adjustable Thermostat, Stay-Cool Handle, Tip-Over Switch & Overheat Protection System?

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I don't know how big your tent is, but the standard 1200 to 1500 watt resitance heaters won't do a whole lot semi-outdoors especially at the predicted temperatures. Anything with more wattage will require a dedicated 20 amp circuit with a 12ga or 10ga extension cord (depending on length).

I'll look in my basement tomorrow, I should have one like this https://www.amazon.com/Comfort-Zone-Filled-Deluxe-Radiator/dp/B018WO5YMO and one like this https://www.qcsupply.com/21002-utility-heater.html