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See exactly how much you save on electricity bills by replacing your electric geyser with a solar water heater — month by month, year by year.
Switching from an electric or gas geyser to a solar water heater is one of the most effective ways to slash your utility bills. Depending on the size of your family and the length of the winter season in your region, water heating can account for up to 25-30% of a household's electricity bill in India.
A standard 200 LPD (Liters Per Day) Evacuated Tube Collector (ETC) system costs roughly ₹18,000 to ₹20,000. For a family of 4 using a 2kW electric geyser for 1.5 hours daily, the annual electricity consumption easily exceeds 1,000 units (kWh). At an average rate of ₹8 per unit, that is over ₹8,000 spent just on heating water every year. A correctly sized solar water heater eliminates up to 80-90% of this cost, leading to a payback period of just 2 to 3 years.
India receives excellent solar radiation for about 300 days a year. During summer (March to June), your solar water heater will easily reach temperatures of 60°C to 80°C. During winter (November to February), when demand is highest, the system operates highly efficiently on sunny days, easily reaching 50°C to 60°C, which is more than enough for bathing.
During the monsoon (July to September), continuous cloudy days will reduce efficiency. This is why solar water heaters come with an inbuilt electrical backup heating element (typically 2kW or 3kW). You will only pay for electricity on days when solar radiation is insufficient.
A standard 200 LPD solar water heater can save around ₹1,000 to ₹2,000 per month depending on electricity rates, daily usage hours, and the duration of the winter season in your city.
Yes, but with reduced efficiency. On cloudy days, a solar water heater can still pre-heat water. Most systems come with an inbuilt electric backup heater which is turned on manually or via thermostat to reach the desired temperature during heavy rains.
Evacuated Tube Collectors (ETC) are cheaper initially, leading to a faster payback period (often 2-3 years). Flat Plate Collectors (FPC) are more expensive but have a longer lifespan and better resistance to physical damage. Over a 10-15 year horizon, both offer excellent monetary savings.
An ETC solar water heater typically lasts 10 to 15 years, while an FPC system can last 15 to 20 years with proper maintenance. Since payback usually happens within 2-4 years, the rest of its lifespan generates completely free hot water.
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