Two days is not that big a deal. Do not run out in a panic and buy the first heater you can find. Take your time, find what you want, for the price you are willing to pay. The gen set will not self destruct in the near future. Wait until you do not need it, then take care of the problem. I start out at 40-50% load. run it an hour or two. Then step it up to 70-80% if you can. Better yet, is 100%, but if you can not get it that high, it will still be OK. Run it a hour or two. If your set is wet stacked, the dried carbon WILL come out of the exhaust and be like fallout. It will get on and in everything. So do not park your Lamborghini down wind. It also can and has happened to me, set the woods to burning.
The reason I say wait until you do not need the set, is so you can take your time, read the directions, hook it up SAFELY and not have to worry about keeping your house powered up. Later, when you KNOW how to hook it up and run in conjugation with your house, SAFELY, you can step up the load a tad, and not knock your house off load.