Harold Kestenholz
A recirculation pump with a temperature control may be what you need. A circulator that runs constantly uses more energy than necessary and may have deposits from the water settle in the circulator faster than one that turns on when the water needs to be warmed in the line at the last tap.
http://www.lainginc.com/howhot.htm
http://www.thecontrolsgroup.com/catalog/01/pages/HON_L4006_L6006_Aquastat_Co.htm
see model L4006C
