Vitodens 200 hot water temperature hysteresis

[mhejsek_gmail]

Hello,

I have Vitodens 200 with external bivalent hot water tank. Primary source of energy is PVE. I want to maintain temperature of water heated by gas as low as possible (40 °C). I recognised, that hysteresis (temperature when the boiler starts heating of water) is 4 °C below that (36 °C) which is quite cold for shower. I would like to decrease this to about 2 deg but i only found upper limit in boiler parameters. Is there any way to solve it?

Thank you

[qwert089]

Hello,

What vitodens 200 du you have?

A new one with the new control technology?

Or an older one with vitotronic controller

the parameter for the vitotronic is in coding level 2 . Code 59.

the default value is 0 with a difference  of 2,5K below the setpoint.

for the new controller check parameter "1085.0 „Speicherbeheizung: Einschaltpunkt Sollwert“"

the uper hysteresis can not be changed.

BR