Hi Bogdan,
please contact your regional service via mail, you can find the address on the Viessmann homepage of your country under "Contact".
Best regards,
Chris - Customer Care Team
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Hi, I have a 100-w but the pump does not provide enough circulation with microbore system to heat rads, takes VERY long time to warm up - pump max setting already set to 100%, how can I increase pump MIN setting? Thanks for help
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