Add a immersion heater to outdoor boiler?

To get a real idea of my situation I'll have to give you a little idea of my setup. I am living on 100 acres in an old farmhouse built in 1889. The farmhouse as you can imagine is not very well insulated. I did change out almost all of the old single pane windows to new double panes. I have been living in this house for about 3 years now and the only way to heat it (without going broke) is an outdoor wood boiler system (freedom eliminator 36). However, the amount of wood I burn is insane. I go through an 8ft truck load and a half per week when the temperature is below freezing here in eastern ohio. I was hoping part of my problem was the underground water pipes weren't insulated enough so after my first year with the boiler i dug them up and bought highly insulated ones in corrugated pipe and then inulated them even more before burying them. The new pipe was a waste of time and money.......I know that insulating this 3,000 square foot old farmhouse is the answer but I do not plan to live in it forever I intend to tear it down in the next ten years and rebuild a smaller more EFFICIENT home in its place. So putting insulation in the entire house is not an expense I am willing to do.
The main question I have is if an immersion heater inserted out in the boiler would be a way to use less wood, while keeping the temperature up. I wouldn't mind if the electric bill went up a 100 bucks or so per month but I wouldn't want it to go up any more than that....Is this something that is even feasible, the screw plug immersion heaters would be easily installed and the electric is already ran out there. This would be especially handy when my fiancee is home alone hopefully she wouldn't have to load it as often?? Any help, suggestions, or opinions would be appreciated, thanks...Cory

Thanks for all the replies, When I redid the underground pipes I did not check the amount of heat loss first. I just assumed that the culprit had to be the pipes because their is no way I should be burning that much wood. The pipe I used was good stuff I did my research on that and I even insulated around it even more before burying. I'm glad I asked before I went any further with the immersion heater idea, I was just hoping their was a simple way to cut down on my wood consumption before the weather really rolls in. I uploaded a picture of the house with my old taylor wood stove that has since been replaced with the freedom. I posted it to show how big ithe house is, I think that thats my problem more than anything its too big and too uninsulated. The baseboard heaters are a good idea maybe ill give them a try.