If it is an all-in one solution or an add-in heater that says it is safe in plastic buckets, then you are okay. These heaters generally have a thermostat that keeps that water just a little above freezing, maybe 40 degrees.
There are a lot of options, but most all of them use basic electrical heaters to keep the water above freezing.
There are a lot of options, but most all of them use basic electrical heaters to keep the water above freezing.
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