http://www.youtube.com/watch?feature=player_embedded&v=lEmUYJ3Qs7UThe kagi in action... I have used it for three seasons, but do not expect any waste oil burner to work well without doing your prep work. You have to clean them all almost every time you add more oil to your tank. Buying inline filters will help I have a washable lenz model. I clean my burn chamber 1 to 2 times per season, and my exhaust pipes. i wash my filters every time i add new oil. I have a suction filter on my pump.
The kagi unit is designed to burn oil at 100 micron cleanliness, and has a nozzle designed to burn dirtier oil. it does not use a metering pump because Tom believes if the filter is dirty then clean it do not put strain on your gun it will decrease it life expectancy.
it has an on board pump and preheat er, i have no preheat-er in my tank but my tank is room temp.
I would not recommend buying forced air type as waste oil burners just last longer as a boiler.
i am in love with my unit it has saved me thousands but getting to know it is part of using it. you almost have to be able to meditate with the thing, i might even know more about it than my fiance or good friends. (Sad I know) you get good at taking them apart cleaning them and putting them back together. You will need to do this with all of them so just pick one. you can add upgrades to the kagi as you go, smarter relays, different nozzles, cad cells with more sensitivity, you can buy different length blast tubes. just depends how much money you want to spend.
kagis long blast tube is designed to be installed in wood boilers.