http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=20;t=002145;p=1 is a good thread that I will not try to repeat info. If you plan to aerate your pond I would seriously consider a pump and dump system or burried loop over a pond loop. I am happy with my pond loop but according to the manufacturer of my unit I should not aerate or otherwise mix the water column. My all electric house monthly bill has averaged less than $100 per month for over two years now. My Dad's house next door is 1/3 smaller than mine with an older traditional heat pump, electric furnace, and even using his wood burning stove his electric bill is more than double mine.
