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WE used it in our waste oil heater which was EPA approved. Close to 1000 gallons a year. The heater preheated the oil and injected into a combustion chamber with ceramic diffusers and a very efficient heat exchanger. It produces 135k BTU of heat at close to 97% efficiency. I could stick my hand into the flapper in the exhaust pipe and there was very little heat lost and the unit itself was inside the shop so any heat radiated from the unit was also utilized.
Collected on site and used on site. At the end of the winter season sometimes we had to buy home heating oil or get more waste oil from some other businesses.
It's still doing the job even though I have no owned the shop now for 11 years. Paid for itself several times over in fuel cost savings.
regards
Mech
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