I quit with the heater and got a small propane bottle, we can exchange them at almost any convenience store around here for about $20 US, they sale a big sunflower attachment for them by a company called Mr. Heater I think. Doubt I could link here but will try and get you a better description. Really keep my place nice and on low would run for 5-6 days before refill need, bit expensive but so is my bud, and wasn't much difference in electrical cost with a 1,500watt heater that couldn't keep up. Most will come on screaming at me that they are not safe inside, but that's BS, been using them for years camping and such even in tents before I got to old for tents. I upgraded to one that has a quick disconnect and could leave the tank outside if I wanted too, it also had a blower on it, but I just used a box fan to keep the warm air moving down low longer. Cost me about $130 for that set up from Ama u know who.