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Hello, First I want to thank you for your reply to my inquiry. I have several questions and will be happy to reply. The manual for my boiler De Dietrich MCR 24/28 MI, nowhere mentions that there OpenTherm standard, no logo, but the circuit diagram of the terminal 7 and 8 have written...

Hello, I am from Bulgaria. I have a boiler De Dietrich MCR 24/28 MI. Currently the boiler is controlled by a thermostat on/off. I want to replace it with a modulating internal temperature with OpenTherm standart. In Bulgaria only available model "DeDietrich-easymatic", which costs over 300...