Installed the 200L solar water heater from VGaurd . It worked fine for 17 months and all of a sudden, all the 20 glass tubes got broken fully. The tubes are not covered under warranty. The VGAURD people blaming on the Airwent problem due to plumbing. I had used the certified plumber to fit the Airwent and all. The VGAURD people are now very careless to respond and now not attending the call at all.
Hence I do not recommend the solar water heater which is based on the glass tubes.