I have an installation set for end of May. I heard my regional warehouse is still stocked with T5 Series D version and waiting to run out before stocking with the LE's. It may be out of my control as to which version I get, but to be honest, I'm now beginning to hope a bit more for the LE with the EPA2020 EBT2(?) design and just keep my fingers crossed that it works well. Regardless of EPA2020 rules, maybe PE would have done some of these changes earlier if it weren't for the required cost of testing the stoves each time they did a major change? (Only their engineers really know.)
So here's a little thought flow, excuse me.... Like the weather, I've spent a lot of time thinking about things that I really can't change now that I'm contractually (voucher program) committed to a stove . I can't count the times I've looked at the EPA test report for the Super series LE and the 1 page EPA report for the Series D trying to decipher information from them. I'm beginning to conclude that besides volume of the stove, there's not a whole lot to learn for a lay person like me. (Can somebody tell me how they get their efficiency calculation from the data? ) Both reports seemed to be 14 or 15 pounds of crib wood (which I don't plan on burning) placed in the stove in the way I would never burn. The new reports give more detail - like now I know that the minimum BTU rating just comes from that 14 pounds of crib wood burning a the low level - perhaps a benchmark reference, but not replicating my future use of the stove. And to imagine these reports are based off of a small sample size of only 5 or so total burns and only 1 or 2 burns at each level, when we all know how much variability there is in the wood burning process - I'm not going to split hairs on small differences produced by their data.
What has recently struck me when comparing the two reports , is that with the crib wood, the minimum burn level for each stove still has them burning about the same number of Kg/hour of wood (.95ish) for both the Series D and LE stoves. The higher burns (air level wide open) are also roughly the same for both versions of the stove. So perhaps as far as the user goes, there's not a whole lot of functional difference.
I emailed a certain well known seller of PEs and that person praised both the Series D and LE as having had excellent performance, just one a bit cleaner. (True, one has a shorter track record.)
Regardless, with 20+ feet of straight up pipe, I'm suspecting I'll be having to cautiously learn some new burning techniques to keep either version of a T5 tame.
One last thought of this long post: What would be the biggest difference between secondary air linkage (series D) and EBT2 (LE version)? Having a smoke dragon, I can only try to imagine from reading posts online. Here's what I imagine:
- Secondary air linkage (series D): When you reduce (or increase) the primary air, the lever is connected to a second cover that also reduces (or increases) the secondary air intake. It's deterministic. Primary air opened, say, X cm^2 , secondary value opened k*X cm^2 with k is a factor of how much smaller the secondary is than the primary (so k<1). The user controls X, k is fixed.
- EBT2 (Series E): It has a small fixed secondary air, and the EBT2 valve adds additional air when there's a strong draft in the stove caused by lots of wood & gasses burning. So primary air is set by user, say, X cm^2. The user controls X. Secondary air is fixed plus the dynamic EBT2 system. So the secondary opening is, say, Y cm^2 when the EBT2 is closed and (Y+Z) cm^2 when the EBT2 is activated, where Y is the size of the fixed secondary opening and Z is the additional opening from the EBT2 when it is activated . The user has no direct control over Y or Z.
Do I have the general idea?
(I should stop having fun figuring out how to add equations to this forum and get to bed....)