I have already purchased this solar water heater and I am using this solar water heater from one year. But I experience that this solar water heater work properly in the summer season but in the winter season while there is raining or when the sun is not raised it does not work properly because solar water heater only works by the sun rays and when there is no sun rays it doesn’t work and the water is not heated. so in other words I can say that this solar water heater does not useful because of the above reasons so I advise that we should not purchase this solar water heater.