Since the water heating takes place following diffused radiation in the atmosphere, you will continue to get warm water for a day or two during cloudy days. In such scenarios, an electrical back-up is provided to the storage tank of solar water heater, and is switched on if the water in the tank is not as hot as required.

A solar heater of capacity 100 litres is suitable for about 4 people and depending on the amount of water usage it can save up to 1500 units of electricity per year. It also reduces greenhouse gas emissions besides saving litres of fuel burning and thus saving your money. Higher-capacity solar water heaters will save more electricity.

Solar water heating systems like other solar products have extremely low maintenance requirements. Rare leakages due to wear and tear can easily be repaired by plumbers. In case of scale deposition in the collectors over the years following hard water, solar water heater suppliers should be contacted for cleaning or de-scaling with acids. In case of a broken glass tube, solar heater suppliers should be contacted. The outside surfaces of the solar heating systems should be painted again in every 2-3 years to avoid surface corrosion.