Jack,
Keep using Diesel fuel. Some problems that will occur are that soot will build up on the burner coil and water moisture will build up in the fuel tanks. These problems can be minimized by using a product called Red Devil. This Product must be used CONSISTENTLY or it will not help. It is not an overnight cure for these problems. You must use it with frequency or not at all.
I purchase Diesel fuel for 90 cents a gallon with no road taxes from Phoenix Fuel. I am a lucky person to live in a metropolitan area. They have pumps throughout the city. Each of my rigs have 110 gallon tanks. This is due to D.O.T. regulations that state a rig can only carry 110 gallons of fuel. If you are in a rural area, you can transport up to 600 gallons of diesel fuel on a D.O.T. approved trailer but you must obtain a permit.
De-scaling your burner and draining your fuel tanks are small problems compared to the problems connected with kerosene use. Kerosene has a higher flash point than diesel. It is also more expensive (by approximately 50 cents a gallon. An increase of 64%) and much more dangerous. Kerosene is not readily available and must be stored at specific temperatures. Certain OASHA regulations ban the use of kerosene. Other major corporations have adopted these policies as well and also ban the use of gasoline and kerosene. I realize your machine may not burn diesel to run the motor but keep in mind, some companies will only allow machines run entirely by diesel fuel.
A special note when working inside of buildings, you MUST use propane. Any machine can burn propane as an alternative fuel. I am not suggesting that you use propane when working outdoors, but as far as environment and conditions, there is no better fuel.
From someone who has years of experience with this kind of work. I am always willing to give useful advice to those starting out in the business and I always look for ways to improve my company as well.
P.S.- Will have more info on flash points later.