My wife has been complaining about how long it takes for the hot water to arrive in her upstairs bath. I've been looking at the Grundfos Instant Hot Water Recirculation Kit and wonder if you compared the two.
My only problem is she absolutely hates the new rental powervent gas water heater I recently had installed and wants it gone. She wants me to install a tankless but I don't think they are quite what they're made out to be and AFAIK they are not compatible with any Instant Hot Water Recirculation Kit. There's a minimum (0.6 or there about) GPM required for a tankless to fire.