I say if you can afford it run electric. I ran a 350' run to mine last fall for my aerator and am very happy about it. Main reason I decided to pay a little more is I read too many stories about the airline freezing up this time of year in the northern states from getting moisture in the line and then collecting in a low spot. Hard to make the airline run 700' without having some low spots. Then you have some major problems. Electric lines can have high, low, and straight runs with no problems!!! See you're in Ohio so it would definitely affect your pond....