I have been using this geyser from last month. The only problem I am facing is its turn around time to heat water. It takes around 45 mins to heat 15 l of water at 75 degree C .
Other than this I did not face any issue but this is a major problem. Its insulation is also not good as if it heats the water and if I switch off the geyser and then use water after some hours then water will not be hot anymore.