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Just had a new heating system installed with a bypass valve to keep some water from entering boiler therby creating slower, more consistent heating of radiators. When the bypass valve is opened, hot water backs into the system and heats radiators-not a good thing in the summer. Installer wants to install a flow valve to eliminate the problem. Is there something wrong with the piping setup, and will the installation of a flow valve cause a reduction of system efficiency by restricting flow in system.