I saw your program where you recommended using a recirculating hot water system to help prime the hot water line on a Tankless hot water system. I believe the system you used was a TACO D'MAND recirculator. What I would like to know is, when the recirculator kicks in and draws the cold water out of the hot water line, where does the recirculator send the cold water from the hot water line? I do not have a hot water tank, so is the water being fed back to? If the water is being fed to the Tankless water heater will this type of setup void my Rinnai warrant?