We have two 300 liter, indirect heating solar water heaters from Tata BP. Both tanks are rusted at all joints and leaking. I checked for replacement, but the same model is not available. But for an ordinary direct heating tank, they quoted Rs.35000 for the single tank.
First of all the solar water heater prices are so much elevated, they hardly have anything in raw material and construction cost. I would estimate they should not cost more than Rs.4000. They are just cheating consumers with a crap products
I suggest anyone who buy a solar water heater from any brand, get an unconditional warranty of 15 years at least. Otherwise, be prepared to spend an average cost of Rs.1500 per 100 liter water heating per month which is just nonsense.