The Racold Alpha Plus 500 LPD ETC Solar Water Heater is a large-capacity evacuated tube system with a stainless steel SS-316 inner tank, sized for 10 to 15 people, carrying a 5-year tank warranty. It uses 34 tubes to heat a 500 litre tank, protected by a sacrificial anode rod and rated for water hardness up to 1000 ppm. It is a gravity-fed, non-pressurized system.
Stainless steel, and what that means at this capacity. The inner tank is SS-316 the corrosion-resistant grade used in marine and chemical environments backed by a sacrificial anode rod that corrodes in place of the tank. On a 500 litre installation the tank is the component you cannot easily replace: doing so means dismantling a 34-tube array off a roof. Stainless steel resists corrosion structurally rather than relying on a coating that can be damaged, which is a different approach from the glass-lined tanks used by most large-capacity heaters, and one that suits an installation running hard every day.
Capacity for a joint family or establishment. At 500 litres this serves a joint family, a PG, a hostel, or a guest house where 10 to 15 people need hot water in the same morning window. Thirty-four evacuated tubes feed the tank, each holding 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 which matters most in an establishment, where running out mid-morning means complaints.
On hard water read this before ordering. The 1000 ppm rating suits moderately hard supply. If your borewell water runs harder, as parts of Bangalore and Hyderabad do, a tank rated to 2000 ppm will outlast this one Sudarshan Saur's glass-lined range, Supreme's ETC range, and our own Varistor ETC all handle 2000 ppm, and Supreme's ETC carries a 20-year warranty against this unit's 5. On a 500 litre system where replacement is a major job, matching the tank to your water is the most important decision in the purchase. Have your water tested and tell our team the figure before you order.
Two things to confirm before ordering. Your overhead tank or Sintex must sit at least 6 feet above terrace level, because this system runs on gravity. And if you have a booster pump on your terrace, this product is not for you — you need a pressurized model instead. Send our team a photo and measurements of your terrace and we will confirm before you spend anything.
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. Our team confirms whether 500 LPD suits your household or establishment, tests your water hardness against this tank's rating, and checks your terrace and tank height 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, and we handle Racold warranty support afterwards. Compare the Racold Alpha Plus against Supreme, Sudarshan Saur and other large-capacity heaters on our platform, and check the current solar water heater 500 ltr price. Talk to our team for the installation timeline in your city.
