Strange question. Niece and hubby are substituting diesel fuel for oil to heat the home they rent. Is that OK?
I think that's fine, so long as the exhaust leads right out of the house. You don't want to have even a little of those fumes circulating inside.
So I have learned, however, yesterday they had to clear the house for a bit, three adults and 2 wee children. Her husband had just filled the tank. I'll pass that info along to them. THANKS