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Fish tank heaters in plastic tanks is a disaster waiting to happen every time. I cant count how many times i drained a tank and forgot the heat was on it.
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That wouldn't be a problem for me. I am in the habit of cleaning the reservoir at every
nutrient change. That includes unplugging the
pump (to clean it), and scrubbing out the reservoir. I would be unplugging the heater and cleaning it as well. If for some reason that is not the case for you, it would be simple enough to place a insulating plate in between the heater and the reservoir. Or using a piece of 4 inch tubing placing the heater in it, and cutting slots in the tubing for water circulation. That would keep the heater suspended even when there is no water in the reservoir.