At 11:56 AM 11/6/2008, you wrote: >is a thermo siphon feed as done in days of old. This is self >regulating and worry free Why is the system worry free? Don't the coils thermo siphon into a tank that could overheat? Thanks Drake Chamberlin Athens Electric OH License 44810 CO License 3773 740-448-7328 740-856-9648