I just started the 4th year of use with my KeroHeat CTN-110 and I couldn't be happier with it. I use it as the primary heat source in my one bedroom apartment. When I buy anything, I typically research as much as possible before making a decision, and I think I chose perfectly this time. I looked into small wood stoves, window pellet heaters and anything else I could think of. After I researched all the possibilities, I decided I would try a kerosene heater. I had some doubts because I heard a few negatives about using kerosene heaters, but I've since come to learn that if used properly, there isn't really anything to worry about. I had heard they were dangerous, but research showed that electric heaters proved to be far more dangerous statistically. Yes, kerosene heaters can be dangerous, just like any heater, woodstove, pellet stove or fire place can be dangerous if not used safely. But if used properly, kerosene heaters can be safer than other heaters, especially electric space heaters. Another negative I always heard was the smell and possible carbon monoxide. Well, after burning off the initial smell from being new, it hardly ever smells at all other than a little when starting it or turning it off. Mine can heat continuously for up to 13 hours depending on wick setting without any noticeable odor. And as far as carbon monoxide, I think it's always a good idea to have a carbon monoxide detector just in case, but mine always reads zero when my heater is in use. I can leave it on all night without worrying about a wire sparking or shorting out like a space heater could possibly do, or an ember from a fire place popping out on to the carpet or wood floor. I just love it. I almost bought the 23,000 BTU model, but I saw from a lot of reviews that they use a lot more fuel. The CTN-110 is a 10,000 BTU unit and to me, it seems like more, and it sips kerosene. I often have to turn it off or crack a window on cold nights because it gets to hot in my apartment. I turn the unit off when I go to work and turn it on when I get home and it heats my apartment fast. If it's freezing outside, I may close the bedroom door or block the kitchen doorway with a curtain for a half hour or so just until the rest of the apt heats up, but it'll go from very cold to very comfortable in 15 - 20 minutes and I have to open up the bedroom and kitchen. Like I said, I did a lot of research before deciding on my kerosene heater. I learned that kerosene heaters are the main heat source for homes in Japan, and besides wood, kerosene heaters were the main heat source here in the USA before electricity. The "Perfection Kerosene Heater & Stove Company" was huge 100 years ago and there are many "Perfection" Kerosene heaters around today and still in great working condition. I'm sure a lot of people who are considering a kerosene heater have some of the same concerns I had, well I'm one person who has been won over. When I decided to purchase a kerosene heater, the next question was which one ? Well, after a lot of research, I decided on the KeroHeat CTN-110. If I remember correctly, there were 3 or 4 different brands that all looked very similar, but after reaching them, I found out that they were not all alike. The CTN-110 was by far the best reviewed. The only thing that I don't like is that I have to fill the fuel tank once every day or two during the coldest days of winter. But it's not a big deal, the tank comes right out and it takes about 2 minutes to walk outside and fill it. I actually look forward to using it on those freezing nights, and I think my cat loves it even more than I do. She is an indoor/ outdoor cat who comes and goes as she pleases, but she hates the cold. She will come in from the cold and stare at the heater from about 2 feet away. After a few minutes, she is stretched and sprawled out on the floor in front of the heater just soaking up that heat from the floor. She will gradually move further away from the heater through the night because it gets so warm and I always have it on the lowest wick setting. If I get up during the night to use the facilities or turn the heater off because its to warm, my cat is laying on the floor in the kitchen as far away from the heater as possible. The only thing I really worry about when it comes to my kerosene heater, is if a guest knocks it over. But that has never happened and it does have a safety turn off switch if it does get knocked over. I just make sure any guest's realize that there is a kerosene heater in the corner, but it's never really been an issue. If I have a party or something, I wouldn't use it. Bottom line - It's a great heater and pretty cheap to operate. I think I paid about $110.00 for the heater and I estimate it cost's me about $80 - $100 per month to heat my place. I will occasionally run my furnace but I'd say I use my CTN-110 as my primary heat source 90% of the time. I love it.