Yes, we are only dealing with a small water volume here. a cheap (under $10) little 7-10 watt heater would maintain the water at 5, 10 or 15 degrees above what it would otherwise be. This heated water would lose its heat upwards into the soil. Depending on where you lived, that could add a month or two to both the beginning, and end of your season, especially if you only added warm/hot water.
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