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Does anyone know where to purchase good solar panels to use with a thermosiphoning DHW hot water system? Does thermosiphoning make sense for DHW in the northeast at the latitude of Long Island, NY. I set up a thermosiphoning system at this latitude and it has been working great in the summer but towards the end of August unless there is bright, hot sunny days the output falls off dramatically. In the northeast it may make sense as a supplement to an existing DHW from Thanksgiving to April 1st and then drain it during the winter.