Voltas is a big brand that I accept and it has expanded their business in many other different fields like air conditioners, refrigerators, water coolers and purifiers, etc. There is a water purifier in my office which is there for 6 to 7 years that I knew from a person of my company. The water purifier works well that is it gives out hot as well as cold water but not from the set buttons but from wrong buttons and also it stops working sometimes. And its heating capacity is slow but I think it should increase their thermal capacity. The thermal capacity should be around 5 hiurs I think but its on you guys how patient you are.