On Fri, May 6, 2011 at 10:27 AM, William Couture wrote= : > Hi all, > > My wife has decided that we should get a tankless hot water heater to sav= e > energy. > Why do you want to heat hot water? (sorry) Tankless water heaters come at quite a cost premium over tank units of equivalent efficiency. If you have gas service, the most efficient and economical option may be a "condensing" gas fired water heater. --=20 Martin K. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .