No, the empyre elite was designed around the notion of not having to have storage, or a dump zone, or a pressurized system. Efficiency peak has also been reached in these units, burn chamber temps are over 2000 degrees and yet exhaust temp is only 300. If you start dipping below 300, you have condensation issues in the chimey and there isn't enough heat left to carry moisture out, so it's about as efficient as it can possibly be.
They have 2 models, elite 100, and elite 200. Folks are heating very large 5k plus square foot homes on these without any issue and wood usage I'd minimal. They are also EPA phase 2, there is a b415 testor standard in Canada they use and these units were 5 times cleaner burning than what was required.
The elite series also won the vesta award, it is a world wide award where anyone who is in the heating business submits there latest unit for testing, it won hands down. Some of the brands u mentioned were also entered.
The units are also hybrid ready, they have ports where you can install electric heating elements into it to have electric as a back up if need be, it is an option.
Maintenance is also a big plus on these units, they only have one set of tubes vs other models having 3 sets, yet efficiency is maintained. There are many many pluses to these boilers