Central boiler heat rating is at peak output
When wood burns down btu output goes down
I chose 6048 over the 5036
For approx. $2000 extra you will get longer burn times due to the larger water capacity
Out of all the brands i researched it has the largest wAter cap.
Initial startup takes more wood/time but once up to temp it doesnt take anymore energy to maintain water temp
Im looking at 24-36hr burn time heating comparably same sq footage as mentioned above