I confess to having been misled into thinking that Erik's example related to the evotouch.
Perhaps Rameses you could let us know whether Erik's illustration (including the 100% spikes) is typical, or whether the evotouch system with OpenTherm interface can in practice achieve the utopian state of equilibrium heat demand/flow temperature that I wrote about earlier?
As you point out there are limits, and my boiler (max o/p 12 kW, min 3.7 kW) has just come on for about 45 secs!