I was worried about the cold up here. We will have three weeks of -10c each year. To keep my lines from freezing we went with a rocker pump and 3/8th line to the air disks. We put the air pump down at the pond to keep the heat and we were running power down to run the waterfall too.

Moral of my story is if your line ends up freezing smaller line will help hold the heat but make sure your getting volume. Just like what Bill said the rocker pump has pressure and heat to spare, but the pump house needs cool clean air.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.