Vitocal 200-s mixes DHW

aconjaer — Mon, 13 Mar 2023 18:51:23 GMT

Hi community,

I have a Vitocal 200-s heat pump which supplies both the DHW and heating. I notice that my DHW temperature in the boiler decreases way too fast (from 45°C to 38°C in 5 hours). However, when I completely shut down the heat pump, the temperatures remains stable for a much longer period. In the attached picture below, I've shut down the system between 22pm and 6 am. In this period the temperature only decreased 3°C over 8 hours. This made me think that mixing occurs between DHW and the heating circuit. A Viessmann technician already replaced the 3-way valve, so I think it's unlikely this is the cause. Is there anything else I'm missing out here?

Kind regards,

Andreas

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BernhardW1 — Tue, 14 Mar 2023 06:27:11 GMT

Do you have a circulation pump installed (and running)?

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aconjaer — Tue, 14 Mar 2023 07:35:57 GMT

I do have a circulation pump, but even when I shut it off and close the valves on the circulation circuit, the temperature still decreases.

Thema "Betreff: Vitocal 200-s mixes DHW" in Wärmepumpe & Hybridsysteme

Vitocal 200-s mixes DHW

Betreff: Vitocal 200-s mixes DHW

Betreff: Vitocal 200-s mixes DHW