" is below 40 degrees, it's not recommened to put them on a timer. We ran
several of them for years, to actually keep stock tanks open for a herd of
cows. They really don't use any more electricity than my pump. )
Janet in foggy, raining Niagara Falls,ON

Hi Janet - I never heard you shouldn't put them on a timer - when I used
mine 9 yrs ago, I only plugged it in when it got really cold for a few hrs
at a time, well that is until 2 yrs ago when I had to use it to melt its
way into the pond. It ran for a day and a half that time to get a good size
hole opened up. I keep an eye on my bubbler from now on and I get rid of any
ice dome on the real cold days
How big a pump do you use ? - That heater must run almost constantly as
they will run whenever your pond water reaches 40 to 42F
My pump is a 2500 gal @ ~280 watts and the heater was 1500 watts
Gale :~) in snowing Tilbury