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Seasonal Shutdowns At the end of your swimming season you may have freezing weather conditions. The unions (provided) must be disconnected to drain any water in the pipes. Failure to do so may cause the heat exchanger to expand and crack. This will void your warranty. If you live in an area that does not have freezing weather conditions but are subject to extended periods of non-use, allow the filtration system to continue to run water through the heater. Or you can drain the unit of all water.