Geof --
Here's another idea for you to research -- an oil heater. I have 2 - Toyo heaters .. one in each shop -- Here's their link:
http://www.toyostove.com
I use Kerosene in an above ground bulk tank. If I remember right -- Diesel can be used.
I LOVE my Toyo heaters !! !! !!
Just a thought as I read your posts .. ..
OLDphoneman