The biopro does stir washing. If you run the automated wash cycle the first wash is just mist and settle, this is to reduce the chance of an emulsion. The 2nd and 3rd wash is mist then after the water is in the stirrer comes on for ~10 seconds and then shuts off. The bio is then allowed to settle so the water can be drained off the bottom.

So far so good.. I have just over 1000 gallons processed in this machine and run through my duramax/mercedes personally. Prior to me getting the biopro I was getting fuel from a buddy who has the same processor.

As for the heater you have I'm not sure, I have never used one of those but as long as it will get the biodiesel up to temp you should be good. Just needs to be hot enough for the water to evaporate off.

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'98 E300 Turbo "Juliette"
'85 Federal 300TD