This winter is the first time in 4 years we will keep and overwinter our Koi's and goldfish. We have an aeretor from Aquascape but looking at different heaters, any suggestions? Went to TSC in Rockland and saw different 1500W models.
You could try Princess Auto. They had stuff in the past. Look online.
There is an online retailer called Pets and Ponds that has some heaters for ponds on their site.