I've been fine so far. I have a 20' x 20' garage with 11' ceilings that is only partially insulated. (mostly no insulation) I've only used it in the low 30's so far but it works as I would expect. After about an hour it gets so warm in the room that I don't need a jacket. After about two hours, the built-in thermostat will start to cycle on and off. It replaces a dual tank propane heater that was listed at a maximum output of 30,000 Btu. I wouldn't normally drive that far because it uses too much fuel too quickly. This unit costs around 20,000 BTU and heats the garage in a similar mansion. I've read some reviews where people seem to expect hot airflow like a big propane kerosene heater, but that's not what you get. This is a constant stream of warm air that takes some time to heat up the room. Other than that it does exactly what I want and for the money it seems to be the highest combination of performance and value that I could find that also has mostly positive reviews. Note: I'm not an electrician so please consult an expert and don't take my word for it: One of the biggest confusions for me when deciding to order this unit was the conflicting reviews/posts some of which pointed this out those needing services at 30 amps and others for services at 35 amps. I can confirm that this requires special service for 35 amps (not 30 amps). If I'm not mistaken, this heater is considered a continuous load. Under continuous load, you may only load the circuit up to 80% of the specified power. At 6000 watts that is 25 amps. 80% of 30 amps is 24 amps not 25 amps so needs to be upgraded to 35 amps. With that in mind, I can understand why some people have reported it plugged into a 30 amp service with no problems, but that was (limited understanding in my case) incorrect and potentially dangerous where appropriate. Again, don't take my word for it - the instructions say 35 amps
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