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I have a 17 year old Thermo Dynamics tank less boiler; hard water and partially restricted coil. The copper pipe leaving the coil is hot to touch but the pipe leaving the mixing valve is not so hot. New mixing valve has been installed. The only time I seem to get good hot water is after the boiler reaches 180 after calling for baseboard heat. Regardless of my hard water and restricted coil I would think the pipe exiting the mixing valve should be almost as hot as the pipe exiting the coil. The valve is all the way open. Any help here!