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Remember that a 5-star unit uses less standby energy as compared to a poorly rated one. The device with 5-star rating will come with a heftier price tag but it will eventually help you a lot in saving your electricity cost later. Another important parameter to keep in mind while purchasing a geyser is whether to go for storage or instant model. The Storage geyser heats the water in a tank and keeps it hot. This functionality of storage geyser makes it a better option for bathrooms and several users. On the other hand, instant geysers heat water as it flows, so there is no waiting and no standby loss, but the flow will also be limited. On the other hand, gas geysers are also an option where piped gas is available, however, they need an excellent source of ventilation, as poor airflow can cause buildup of carbon monoxide. It is advisable to never install gas geyser in closed bathrooms. It is always important to check the energy star rating before buying any electrical appliance. Buyers should keep in mind that a geyser may run for hours everyday during the winter season, so the efficiency matters a lot. Always look for Bureau of Energy Efficiency (BEE) star rating. Good insulation, usually polyurethane foam around the tank, keeps water hot for longer and reduces how often the heater switches on. * ISI mark: Always ensure that the geyser carries an ISI mark rating which clearly states that the device meets Indian safety standards. Nowadays, a lot of models are available in the market which comes with various smart features. For instance, the geysers now come with timers, digital temperature displays and app control which can help reduce the use of power and also prevent the appliance from staying on the entire day. These features are use but they should not come at a cost of other important safety features. Also, always check for the warranty, which usually covers the tank fr longer than the heating element. Also, make sure that you go for a brand which has a proper service network in your city.