Ron Rosenfeld wrote:
: What are the design considerations for converting a heating element that
: has been designed to function on 120VAC to 12VDC?

: For example, I have a TANIS system in my a/c which draws about 375W @
: 120VAC.

You wouldn't convert it. You'd just hook it up to ~125 VDC. It will work
great. You may have trouble if it has an electronic thermostat (SCR/TRIAC)
because these require the reversals of the AC voltage to stop conducting
(you can turn on a TRIAC with DC across it, but you have to interrupt
the current flowing to shut it off).
--
Aaron C.