Hi Ingrid - have you done this? - the reason I ask is I have a block heater
for a car that I can use this way - do you allow the heater to get submerged
as it makes the hole deeper - the block heater has a plug connection on the
element that is grounded - do the cup heaters have this connection as well
? - also I hope it won't heat the water above 165F - don't want my fish
getting burned lips (sorry, couldn't resist :~))
Gale :~)

wrote in message
...
for those with real ice over their air stone... they sell little bare
metal core
water heaters that clip onto the side of a cup (for making coffee). they
will nicely
burn a hole right thru ice in a short period of time. get a hole started
with a
spade bit, put in the heater, fill with water and plug it in. put a
little salt in
the water too. INgrid