Here are are the pump curves for a UPS 3. which IMO are quite adequate for your system with that 26kw boiler. On speed 3 it will circulate 2.0M3/hr @ a 4.3M head to satisfy a power rating of 26kw at a dT of 11C.
The Alpha 2 will only circulate 2M3/hr @ a 3.2M head. The pump in the photo is only showing 13W?.
The Alpha 2 will only circulate 2M3/hr @ a 3.2M head. The pump in the photo is only showing 13W?.