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Simply so, do solar water heaters work at night?

Yes, they do. They store water in insulated tanks. The heater collects solar radiation, and the insulation keeps the water hot all night (I learned this from a personal experience using one of these heaters).

how long does a solar geyser take to heat up? 2 to 2 ½ hours

Similarly one may ask, how effective are solar water heaters?

Solar thermal systems convert 60 percent to 70 percent of the sun's energy into heat, while high-end photovoltaics top out at around 24 percent efficiency. Because heating it accounts for 25 percent to 30 percent of the average home's energy use, a solar water heater can make a sizable dent in the utility bill.

Do solar water heaters work in winter?

Solar water heaters don't generate as much hot water in the winter.do solar water heaters work in the winter Systems installed will have freeze protection, and snow will melt off of your solar water heating collector well before it slides off of your roof.