thanks for info, Viessmann Romania already knows the problem with overshooting. And they are quite good specialists (at least in choosing the proper hidraulic parts and setup). The vitodens boiler can modulate fine the temperature around 45-50degC once it started properly (2nd start). This modulation works for 15min (as it is now, outside temp around 10degC in the night - heating underfloor reaches quickly the setpoint) - or it works for 1hour during hard winter. The heating under-floor would get around 43degC. Anyone knows how to change the (electronic or software) filter on reading temperature sensor T2 of the low-loss header? Kind regards, Mihai
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