I have had this unit up and running for about two weeks now and I believe it was a great purchase. Skip to the to the end to see my list of pros and cons. I live at an elevation over 4800' and the Oxygen Depletion Sensor (ODS) has not given me any issues so far. It has been starting to get pretty cold outside. The nights are getting into the teens and it has kept the air inside at a comfortable 70 degrees just on setting 2. The thermostat allows up to 5 different settings which will cycle on and off until it reaches the preset temperature. I have it mounted to the wall and since we only had an electric furnace before getting this unit, I had to run all the piping myself. At first I was using the yellow gas teflon tape but kept running into leaks. I would recommend using a paste instead of the tape as it is less time consuming and not as critical to make sure that the right amount of tape was used. Most city ordinances require a pressure test to be done before they will allow the gas company to connect the meter. For me this was $65 the first time to find out what to do since I could never get ahold of anyone, and unfortunately another $65 to come back out an reinspect the finished leak free pipe going from inside the house to outside near where the meter would be, holding pressure of at least 20 PSI for 20 minutes. Just to be sure, I pumped it up to 85 PSI and let it sit overnight. This was quite an ordeal since there wasn't too much documentation through the city I could find on this. In the end all is well though, it passed and the house is toasty.Getting back to the unit, within the first day or two I noticed a lot of condensation build up on the windows. I discovered that by cracking the window in the kitchen an inch or two, the frost on the windows was greatly reduced. The fan really doesn't work that well and is kinda loud. We have vaulted ceilings and our bedroom connects to the living room, so I'm thinking about installing a ventilation fan between the rooms to bring the hot air inside the room without having to leave the bedroom door open. If I had been feeling more ambitious I would have ran more pipe and installed it near the electric furnace so that the return vent would pick up the heat from the vent free heater and pump throughout the house more efficiently. I still leave the fan circulating the air on the electric furnace without the furnace actually being on and it seems to do a really good job at circulating the air still. For now, here is the short list of pros and cons:Pros:-Heats up whatever room it is in quickly-Easy to install, used the Mr. Heater adapter kit.-Works great in Mobile Home, and is specifically manufactured for them as long as it is permanent (inspector asked me to verify)-Looks great!-Heats upwards, not directly out like the infrared heaters, i.e can use closer to furniture (could be pro or con depending on desired use)-5 temperature settings, cycles on and off-Works fine at elevation over 4800'Cons:-Fan is fairly pointless-Lots of moisture built up on windows due to the combustion of natural gas (as explained above, just crack a nearby window an inch or two to allow for the moisture to escape)That's all I could think of for now, if anything worth noting comes up I will be sure to edit this comment.

I have been using propane space heaters to heat our house for many years. For several reasons: first, our house is big and its old. We have baseboard radiators all throughout the house that are heated by a central natural gas heater and circulated by an electric water pump. The electric pump was what drove up our heating cost. Secondly, we only use a few of the rooms in the house and there was no easy way to create zones as to shut off water flow to rooms that were not being used. The system circulated through out the entire house all the time, which made it wasteful. So the switch to space heaters was the way to go, at first we used propane because it was easy to run the copper lines and propane was cheaper than what we were paying to run the central heater.Then the local gas company began updating all the residential gas lines and equipment, at which time they did the upgrades to our house, I was able to make a deal to install natural gas lines to the locations where we wanted the new heaters at a discount! So after checking the local codes and regulations we were given the green light to proceed with the installation.I chose these heaters because they have a thermostat to control the room's temperature, super nice as each zone could be different, cooler areas for sleeping and warmer ones for daily living. I installed the heaters to look like fire places with hearths and mantel the whole works, which when all said and done cost 1/10 of what a "real natural gas fire place" would have cost and the fireplaces look awesome!Now the great part and the whole reason for this project... saving money on heating! Our heating bill decreased by 1/3 from the original central gas system and about 1/10 from the propane system. After one year of use these heaters have paid for themselves in savings, and by next year we will have broken even with the installation costs.We could not be happier with these heaters. They are super efficient, quiet, and the thermostat does an excellent job of maintaining a zone's temperature. The fans are a little noisy at first, but quickly become part of the background noise. We look forward to many years of use from these heaters.