Waste Oil Heater Forum - Your definitive source for burning waste oil for heat.

Hello everybody,
I am new here to the forum, also new to burning waste oil.  i just recently bought an automotive repair shop that has a waste oil heater in it.  the primary source of heat is a massive coal boiler, and the back up is the waste oil.  i bought the shop last december (already  winter time) and everything was working OK, for the most part.  sometimes there were issues, but they all got resolved one way or another haha.  I do want to use the waste oil heater a little more (or learn to incorporate it in a little more to cut back on coal - i am new to burning coal as well! haha!)  But to start out, I want to make sure that things are running as efficiently as possible, i do not know much about waste oil furnace maintenance.

basically, I have a waste oil burner bolted onto an old coal boiler.  the waste oil is in a 275 gallon tank, which is siphoned/pumped with a gear pump on the floor, first going through a micron filter before it gets to the pump.  then goes up the wall and over and down to the burner, first going through another spin on filter.  that is basically my set up. 

I imagine the coal burner is probably not the most efficient way to utilize the waste oil burner, but not much I can do about that right now.  to me, it just seems the 'cavity' inside the coal boiler is too big for the flame of the waste oil burner, that it takes a lot to heat it up and get it to temperature.  is this a possibility?  i thought about filling the bottom of the coal boiler with some sand to take up space and also the sand would get hot and stay hot.  bad idea? 

i am not really sure what waste oil burner i have, besides the numbers off of it.  I was told it was made by Clean Burn, but according to the sticker the company is called Clean Energy Inc?  and then the following model number CB85HS.  and another Label Serial Number: 5969.   Is that the information that i need whenever getting parts for this thing?

What maintenance should i be performing to this thing before winter?  I was told/taught how to clean the nozzle, which ive done/will do.  it has two filters, a micron filter which i was told never to let the gauge get into the red, if it gets close to the red then i take the filter out and clean it - it never budged last winter.    the other filter is a large spin on/off filter which was changed last year. 

I know that I do need a new oil regulator.  the regulator functions when you increase or decrease pressure, but the gauge is not working so i do not know what the pressure is at any given time.   where can i find one of those?

I am  trying to post some pictures, but i cant figure out how!  haha

thanks guys!