GUESS WHAT ?!? IT DOES WORK!!! last night it was -2 degrees and their water was still free flowing! very happy bout that. i'm sure it also helps that i have their water located inside the coop which keeps it protected from the wind. Today I went one step further and made an insulated huggy that slips down over it because quite often it does goes below zero here at night and the paper work does state this product really only good to zero degrees. What I did was I had saved the insulation blanket that my old kitchen dishwashing machine was wrapped in and used that. It was quite long, 4 ft. i think so I cut it in half . The insulation was encased in thin plastic like a garbage bag. I took duct tape and covered the entire one side of it with strips of duct tape (so chickens wouldn't pick at the insulation) and took it out there and wrapped it around and fastened it with more duct tape. I think this will work quite well for me.
Up until now I had been refilling their water every single day and when it froze changed it out three times a day. Even though I only have four hens am really glad this bucket holds 3 gallons of water so I only need to carry water out there about every fourth day now! It's becoming increasingly harder challenge for me to carry items and walk any distance doing both at the same time so this is really going to make a big happy difference for both me and my girls!
Also want to share an idea that i found here. This gal is so clever. Never would I have thunk this up on my own. It's a Cookie Tin Waterer Heater by Kathy Shea Mormino, The Chicken Chick® !! If I hadn't already just bought my heated poultry bucket I definitely would have made this. Still might just for heck of it ! Always can use a back-up plan. Please visit her site. She's got photos and an instructable all ready made up on how to do this clever idea!