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I have a Navien NCB-240E combi boiler for DHW and heating (baseboard+radiators) with 4 zones. I have had issues in the past with pressure dropping and boiler stopped working and giving error code E351. Majority of the time It’s fixed by draining the radiators on the second floor (sometimes I...

Hello, I ordered an ecobee thermostat. Now that it has arrived, I have found out I only have two wires R and W going into my thermostat. I have a tankless combi boiler which provides me hot water and fulfills my heating needs. I have 4 zones and all thermostats are connected with two...