Just joined today. I'm running a old Lanair L110 waste oil burner in my shop. According to the date on the label it was made in 1980. It is in pretty good shape tho. I'm in northern Colorado at 7000' elevation. The shop has 16' side walls so I have a 2nd floor in part of it. I put the burner on the 2nd floor to get it out of the way and shorten the expensive stove pipe. When I built the shop I also put PEX tubing in the floor for radiant heat. I'm also running 5 4'x10' solar hot water panels that feed the radiant floor. I put a radiator in front of the Lanair heater so it also is heating my floor. The solar can generate more heat than the waste oil heater, when the sun is shining. Unfortunately the sun doesn't always shine. I'm currently running the heater 4 to 11 hours a day depending on outdoor temp and solar gain. It burns about 1/2 gallon/hr but it can make the shop comfortable. I ordered one of the cheap peristaltic pumps from China and plan to use it to better control the heat output of the burner. Enough rambling for today.