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I came from a call today.A combi boiler in a 1200 sqft apt.Domestic water goes through an electric water heater then to fixtures.(customer complained of nhigh electric bills).On the heat side there is two six loop manifolds piped in series all with actuators.Radiant piping is minitube.Has anyone ever had success piping two manifolds like this,by the way there is problems with heat in every room.Thanks