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There are certainly many ways to warm the water, depending on the budget. On a small budget start with a cover of some kind. A pool solar cover or plastic. I have minimized water movement on my pond and have a 300watt aquarium heater (a drop in titanium heater probe) and my water has been holding at 50 so far with air temps 25-50, without a cover which I need to put in this weekend.
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