FYI
From Toyo's site...
EXCLUSIVE!!
TOYOTOMI Heaters* are the only Direct Vent Heaters available that are Manufacturer approved to operate with Ultra Low Sulfur Diesel (ULSD) in addition to K-1 Kerosene and No. 1 Fuel Oil.
Ultra Low Sulfur Diesel (ULSD) has no more than 15ppm (parts per million) of sulfur content. This is the same diesel fuel that is available at most gasoline stations for use in diesel engine automobiles. If ULSD is available for delivery to your home by a fuel oil dealer be sure to request “off road” prices, meaning that federal and state road taxes have been deducted. In order to maintain the best performance, Toyotomi strongly recommends when using ULSD that the heater be serviced at least every two years because the distillation of ULSD is heavier than either K-1 Kerosene or No. 1 Fuel Oil.
If any of the Toyotomi vented heaters listed below are currently in use and using K-1 Kerosene or No.1 Fuel Oil, ULSD can now be used. However, Toyotomi strongly recommends that the unit be serviced prior to using ULSD and subsequently serviced at least every two years.
*Only the following models are approved to use ULSD: Toyostove Laser L-30, L-56, L-60AT, L-73, L-73AT, and Oil Miser OM-22