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- #25,571
Not if the hand warmers I have are anything to go by. They give out enough heat to warm the hands but not enough to stop water freezing unless it's a very very small cup full. The ones I have last about six hours on the lowest setting. They're fine for purpose but not as a water heater.I think we were talking about battery hand warmers in here...those that have them, do you think if a waterer was set on them, it wouldn't freeze?