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Posted by HeatPro on January 31, 2007 at 10:37:04:
In Reply to: Re: Grundfos Comfort Series Instant Hot Water System posted by Peter on January 31, 2007 at 08:41:14:
The recirculator is started by a thermostat at the farthest fixture, so the farthest part gets the warm water.
http://www.plumbingsupply.com/images/grundfos_pump_diagram.gif
The thermostat is not at the return entrance to the heater, so the entire line is not heated. Other taps being opened, those parts of the system purge warm water if there is any left not cooled by lost heat from the pipes.