Well I have had the new boiler up and running for about two weeks now. I had a 5036 and now 6048. The two major differences I see are burn time and size of log. The weather had been rather mild for our area highs around 30 and lows in the 20. And I was able to get over 24 hours burn time. Heating 2800 ranch, full walk out basement and DHW. In fact I went out of town for a night and loaded it in the morning I left and it was still very full the second evening. I am also able to through in very large diameter logs. I hate splitting big logs, so I had some old birch and oak that was 24 plus stuff and knotty. I cut it in to short pieces 8 inch long or so. And load the chips in. In the old burner I could do this but could not get enough packed in to burn this stuff well. Also the coal bed is enormous compared to the smaller, I know this is management thing. But I like having a bed that never goes cold, helps to dry and burn the bigger stuff. Glad I bought a 6048 before the EPA bans the sale of them.