I got this heater from a coworker in order to heat the second floor of my house without raising my heating bill. The second floor in my house doesn't heat well with the baseboard's heat.
The capacity isn't very large, but it heats very well. Normally it can fully heat a bedroom in 20 minutes; and the whole second floor in two hours. I usually don't leave the heater on in a bedroom while sleeping as the bedroom can get too hot. I've done this several times, and have woken up hot and uncomfortable. Also don't leave the heater plugged in while away from the house as it could start a fire.
The reliability is good. In the winter, I never had to turn up the thermostat to heat my house fully, which is good because it lowers my heating bills. The heater has a dial for low, medium, and high heat. I like this dial because I can adjust it to the seasons. For example, autumn: medium heat, winter: high heat, spring: low heat. The dial has one notch for fan. Although I've never used this setting, I would imagine it would be of use in the summer.
There is no maintenance or cleaning.
The power-efficiency is very good. The fan and motor is powerful and expels a lot of heat in a short amount of time. So for a small machine and a small amount of power, this product is very efficient.
The effectiveness of this heater is excellent! It can heat my whole second floor in an hour, and this isn't just any type of warmth, its toasty warm! It feels very good and it lowers my heating bills.
I love this heater and would recommend it to anyone, however, if you're looking for something to heat the entire house, look elsewhere.