Rust,
#1 and #2 are not the same at all. Toyo Laser 73 heaters should only use #1 home heating fuel or Water Clear Kerosene. If you burn #2 in your Laser 73 it will soot up in less than a week. It is a disaster, do not do it!!!
The difference between the fuels is the amount of carbon in them. # 2 has a lot of carbon and therefore more BTU's of heat per pound than # 1. All that carbon will end up on the burner, blower and in the heat exchanger. It will be the dirtiest job you have ever done.
I have used #2 in the summer. I have been told the difference between 1 and 2 is 1 has an additive so it won't free. I would use oil meant to be used as heating oil because it should be lower in sulfer.
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