The Varistor 300 LPD ETC Solar Water Heater is an evacuated tube system with a glass-coated tank, sized for a family of 6 to 8, carrying a 10-year tank warranty. It uses 24 tubes (2100mm each) to heat a 300 litre tank rated to handle water hardness up to 2000 ppm. It is a gravity-fed, non-pressurized system.
Built for hard water the 2000 ppm rating. This is the number that decides the purchase across most of South India. The inner tank is galvanised iron with a glass coating, and that coating is a physical barrier between your water and the metal. On borewell supply, where mineral-heavy water corrodes an ordinary tank in three to four years, the 2000 ppm rating is what supports a 10-year warranty. Among the water heaters we stock, only Sudarshan Saur's glass-lined range and Supreme's higher-rated units match or exceed it most V-Guard and Racold models handle 600 to 1000 ppm. If your water is genuinely hard, this is the specification that matters most.
Sized for a large family. At 300 litres this serves 6 to 8 people sharing hot water across a morning a joint family, or a household with several bathrooms in use at once. Twenty-four evacuated tubes feed the tank.
Evacuated tube heating. Each tube holds a vacuum layer that traps heat like a thermos, so the system keeps producing on cold winter mornings and overcast monsoon days when a flat plate system slows. For a large household bathing in the same window, that consistency is what keeps everyone in hot water rather than the last person going cold.
Compact footprint. This unit needs 8 feet by 7 feet of clear terrace space considerably less than the equivalent 300 LPD flat plate system, which needs 9 by 10 feet for its three collectors. On a rooftop that also carries tanks and other equipment, that difference matters.
Two things to confirm before ordering. Your overhead tank or Sintex must sit at least 6 feet above terrace level, because this runs on gravity. And if you have a booster pump on your terrace, this product is not for you the Varistor FPC 300 is the pressurized alternative, though it handles only 600 ppm, so if your water is also hard, tell our team and we will find the right combination. Send us a photo of your terrace and we will confirm before you spend anything.
On sizing, 300 litres serves 6 to 8 people. More than that, step up to 500 LPD; five to seven, the 250 LPD saves money.
The price includes transportation to your house, lifting to the terrace, and installation. You arrange the plumbing connection.
SolarClue is India's managed solar marketplace, and Varistor is our own brand we set the specification, we stock it, and we stand behind it directly. Our team confirms whether 300 LPD suits your household, whether your water hardness suits this tank, and whether your terrace and tank height work for a gravity-fed system, before you pay anything. You book with a token payment rather than the full amount upfront. Delivery, terrace lifting and installation are coordinated by us through verified partners. Compare the Varistor against Supreme, V-Guard, Sudarshan Saur and Racold on our platform we will tell you honestly which suits your water and budget, including when a branded unit is the better choice. Check the current solar water heater 300 ltr price and talk to our team for the installation timeline in your city.
