The Fireview ad says it will heat from 900-1600 sq. feet and burn for 10-12 hours, whereas the Homestead ad says it heats up to 1800sq. feets and burns up to 8 hours. Will the Fireview really burn for that long? I wonder how the sq. feet of heated area really compares between the two stoves?
Yes, it will really burn that long, but not if you run it at 650 degrees - you'd need to slow it down to more like 400 degrees surface temperature in my experience to get that kind of burn time. And towards the end, you really see mostly hot coals, but it will still be putting out heat just the same.
As to the sq. feet question - let me suggest looking at this a different way, because houses and thermostat programs are all very different, and those marketing numbers are just best guesses.
If this is for an existing home, you can first determine how much heat do you put into your house over a given season by going over your old bills. (gallons of oil, therms of gas, kWh of electricity, etc...)
Then determine how much wood that equals. You can find a lot of guidelines for this on the web. For example, a cord of mixed hardwood is often considered equal to ~150 gallons of heating oil. This will tell you how many cords of wood you need to burn per winter, and might help put this in perspective. If you're using oil, the comparison is easy - the efficiency in converting oil to heat and wood to heat in a catalytic stove will be close enough. If you're using gas or electric, you need to adjust your calculation a bit more.
If your answer is 3-4 cords per winter, then the Fireview will be fine even if you are gone during the day and sleep 8 hours. We have gone through about 1.5-2 cords since October using it in this fashion. If your answer is 8-10 cords per winter, I think you will have a hard time burning that much wood unless you are home all day to run it at higher burn rates with more frequent loading, or you have a really really long winter
This is why people often say look at the firebox size as the most important number - the end goal is that you need a device that can combust the volume of wood required to keep you warm over a winter season.
-Colin