I am installing a small irrigation system on top of a house For a small greenhouse. I would like some assistance in selecting a cheap but reliable/durable pump that can withstand cold weather. Also if you have any suggestions for sprinkler heads that may have to run during the winter... would be great Greenhouse Scenario --- Water and pump on the side of the house. Tube/Hose runs 22 feet vertically up the house. 30 feet over the roof to this small greenhouse with a few sprinkler heads and drip hose. With suggestions, links to the product would be appreciated... Thanks!!!