For systems that require hotter water for some loops, (like when you heating a cement floor on one level and a wood floor on another) we've developed this simple solution. This Dual Temperature Divider it's a plastic divider that partitions off some pumps and allows the hottest water straight from the boiler to feed those pumps. From 1 to 2 pumps can be in the hotter zone.

This component installs in minutes with no tools necessary.