Putting together a pretty simple system, P/S using a hydrolink 2+1, an Alpha2 pump with zone valves for 2 "high" temp zones (baseboard, hydro air), an Alpha2 pump with no zones after a 3 way mixer for "low" temp (radiant), no DHW for now. ~67k btu heat loss calculated.
Looking at the Knight and Evergreen in the 88-89k output size, they seem pretty similar but I see lots of chatter here on the Knight and almost nothing on the Evergreen?
Both are firetube
Both have 3 tstat inputs with separate configs/priority/ODR
Knight does a 10:1 turndown, Evergreen 5:1
Knight comes with a ECM variable speed Grundfos, Evergreen with a ECM constant speed Taco
Knight has 1 system pump out, Evergreen has 1 pump per tstat plus an aux you configure per input
Knight is a bit more expensive
The Evergreen's controls seem to help me out in this case, I could wire all 3 zones using the endstops with just an extra 24vac transformer to drive the valves. The Knight would need relays/controller or their multi temp add-on to do the same, which increases the price difference/complexity a bit more.
Trying to think if the 10:1 and hassle of extra controls are worth it vs. the less expensive 5:1 with an easier setup in this case?