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If you should have a PV system on the roof, it can be cheaper. Then the maximum output of the instantaneous water heater should be limited to 3 kW. Otherwise it may go into operation with 9kW. Best regards Flo ... Mehr anzeigen

Thank you for advice. Unfortunally at the moment I have not sollar system, but thinking about it. Just first I will try next 30 days to heat DHW with electrical heating element (Elektro Heizelement Boiler Heizung Wasserspender) instead heat pump (compresor) . Regards Ned ... Mehr anzeigen

Under the following link you will find the assembly instructions of the 3-phase energy meter. https://www.viessmann.com/vires/product_documents/5516060VMA00001_1.PDF PV energy meter 3-phase - order number 7506157 Best regards ° fl ... Mehr anzeigen

The electric heating for hot water preparation is needed if your heat pump can not reach the set value alone. In the 1x hot water function is heated to the value Temp 2. With TOP is switched off when the set temperature value is reached at the top of the boiler. "Standard" switches off when the temperature reaches the complete hot water tank. The return temperature sensor of the heat pump is used for this. Which attitude is best for you depends on your personal comfort wishes. The activation of the hot water preparation takes place with each setting after the storage temperature sensor in the top of the hot water tank. For this, the current temperature must have fallen below the setpoint by the set hysteresis. On delivery this is set to 7K. Best regards ° fl ... Mehr anzeigen

No Problem. If you have any further questions or comments, please do not hesitate to contact us again. Greetings Heizing ... Mehr anzeigen