5 star Geysers are generally the power saving storage water heater available in India. The star ratings of water heater geyser is dependent on standing loss of water geyser. Which means the amount of heat lost by storage water heater. So the star rating is more dependent on how long it can store the water hot in the inner tank of storage water. So insulation plays a bigger role in deciding the star ratings. So if you are a person who don’t let the hot water store inside for long or mostly use it immediately then this star rating will play a marginal role in your water power savings.

You should use higher energy star rated water geyser for bigger tank capacity storage geyser. Like for 25liters a 5 star rated is a must. For 10-15liters you can decide between 4-5star depending on price. For 6-10liters 3-4star is enough. It all depends on how long you keep hot water and how hot you set the water geyser temperature to.

Crompton Arno Neo 15-L 5 Star Rated Storage Water Heater (Geyser) with Advanced 3 Level Safety, National Energy Conservation Award Winner 2023
  • PRODUCT: Crompton’s energy efficient storage water heater with fast heating
  • TECHNICAL SPECIFICATIONS: Wattage: 2000 W; Capacity: 15L; Star Rating 5; Pressure 8 bar
  • 3 LEVEL SAFETY: Capillary Thermostat, automatic thermal cut-out & multi-functional valve to provide higher safety, Heating Element – Copper
  • ANTI-RUST: Fitted with specially designed magnesium anode which prevents corrosion due to hard water quality
  • QUALITY COMPONENTS: ISI marked nickel coated special element to provide resistance against scale formation
Bajaj Shield Series New Shakti 15L Storage Wall Mount Water Heater For Home|5-Star Rated Geyser|Child Safety Mode|For High Rise Buildings|10-Yr Tank 6-Yr Element 4-Yr Product Warranty 【White & Grey】
  • ✅ Free Installation and Free Inlet pipes worth Rs.600 by brand.
  • ✅ DuraAceTM tank with Marine grade glassline coating, DuraCoatTM Non-Stick Heating Element, DuraNteTM Thermostat and VoltageProTM – it can wiithstands 45KW Surge Voltage
  • ✅ 10 Year Tank Warranty, 6 Year Heating Element Warranty & 4 Year Product Warranty by Bajaj
  • ✅ Bajaj Shield Series New Shakti has an Unique weld free joint technology for outer body and Pre coated metal body
  • ✅ The product comes with Swirlflow Technology – 20% more hot water
V-Guard Divino Geyser 15 Litre Wall Mount Water Heater For Home|5 Star Rating|Vitreous Enamel Tank Coating|Advanced Multi-Layered Safety|Suitable For Hard Water&High-Rise Buildings|White
  • 【15 LITRE】Storage Water Heater; 【BEE 5 STAR RATED】: Highly Energy Efficient with Extra Thick & High Density CFC Free PUF Insulation for Maximum Heat Retention;【COUNTRY OF ORIGIN】: India
  • 【ANTI-CORROSIVE & SUITABLE FOR HARD WATER USAGE】: Advanced Vitreous Enamel Coating protects the Inner Tank, Superior Incoloy 800 Heating Element ensures Sustained Performance, Extra Thick Magnesium Anode provides Added Protection 
  • 【66% REDUCTION IN LEAKAGE】: Single Weld Line High Grade Mild Steel Tank
  • 【SAFETY ASSURED】: Advanced Thermostat & Thermal Cut-out Mechanism for Dual Overheat Protection; 5-in-1 Multi-function Safety Valve prevents excessive Pressure Build-up, Vacuum Formation & Reverse Water Flow
  • 【HYGIENIC & PUNGENT-FREE WATER】: Multi-layer protection against Corrosion & Scaling
AO Smith Geyser 15 Litre 5 Star Rating (BEE) | Powerful 2KW Heating | Storage Water Heater With 2X Corrosion Resistant Blue Diamond Glass Tank | Warranty: 5 Yr Tank, 2 Yr Comprehensive | HSE-SHS-015
  • DOUBLE PROTECTION FOR SAFETY: Enjoy ultimate peace of mind with this AO Smith 15-litre water geyser. It features a factory-set thermostat, multi-function safety valve, and thermal cut-out, ensuring safe and reliable hot water for your bathroom every day.
  • DURABLE & ELEGANT DESIGN: This AO Smith 15-liter water geyser is crafted with a glossy ABS plastic body and blue diamond glass-lined tank for 2X corrosion resistance, making it the best 15L storage water heater for style and durability.
  • ENERGY-EFFICIENT 5-STAR GEYSER: Save on electricity bills with this BEE 5-star rated AO Smith electric 15-litre geyser. Perfect for eco-conscious homes, this water heater ensures efficient heating while reducing energy consumption, making it a top choice in India.
  • BUILT FOR HIGH-PRESSURE USE: This AO Smith 15-liter storage water geyser can handle up to 8 bars of pressure, making it ideal for high-rise apartments or hard water areas. Enjoy uninterrupted hot showers without compromising performance.
  • LONG-LASTING WARRANTY COVERAGE: With a 5-year warranty by AO Smith on the inner tank, 2 years on the glass-coated heating element, and 2 years comprehensive by AO Smith, this AO Smith 15-litre water heater offers unparalleled after-sales support for peace of mind.
Orient Electric Enamour Classic Pro Geyser|25L Storage Water Heater| High Pressure Epoxy Coated Tank|5 Star rated |8 bar pressure compatibility |Suitable for high rise buildings |5 years tank warranty
  • STYLISH & SOPHISTICATED DESIGN: This orient geyser comes with a pre-coated metal body and stylish design to complement your interiors.
  • SHOCK-PROOF & SPLASH-PROOF IPX2 PROTECTED BODY: This water heater comes with an IPX2 protected, high-strength Polymer body that is shock-proof and splash-proof for an ultra-safe usage.
  • ENHANCED SAFETY WITH MULTIFUNCTION VALVE: The 25 litre geyser comes with a multifunction valve for enhanced safety, as well as a moulded 3-pin plug for better load efficiency.
  • GOOD CORROSION RESISTANCE & EXTENDED LIFE: With Nickel-coated heavy Copper heating element, this water heater is corrosion resistant and durable.
  • 20% MORE HOT WATER OUTPUT WITH WHIRLFLOW TECHNOLOGY: Equipped with the cutting-edge Whirlflow technology, this orient geyser yields 20% more hot water by minimizing the direct mixing of hot and cold water.
V-Guard Divino DG Geyser 15 Litre Water Heater with Digital Display | Suitable for Hard Water | Energy Efficient 5 Star Rating | Advanced 4 layered Safety | 5 Year Inner Tank Warranty by V-Guard
  • Storage Water Heater; 【BEE 5 STAR RATED】: Highly Energy Efficient with Extra Thick & High Density CFC Free PUF Insulation for Maximum Heat Retention;【COUNTRY OF ORIGIN】: India
  • 【ANTI-CORROSIVE & SUITABLE FOR HARD WATER USAGE】: Advanced Vitreous Enamel Coating protects the Inner Tank, Superior Incoloy 800 Heating Element ensures Sustained Performance, Extra Thick Magnesium Anode provides Added Protection 
  • 【66% REDUCTION IN LEAKAGE】: Single Weld Line High Grade Mild Steel Tank
  • 【SAFETY ASSURED】: Advanced Thermostat & Thermal Cut-out Mechanism for Dual Overheat Protection; 5-in-1 Multi-function Safety Valve prevents excessive Pressure Build-up, Vacuum Formation & Reverse Water Flow
  • 【HYGIENIC & PUNGENT-FREE WATER】: Multi-layer protection against Corrosion & Scaling
Havells All New Greta Pro 15L 5 Star Storage Water Heater (Geyser) | Faster Heating | Safe to use | Saves electricity |Engineered for Hard Water | Feroglas Coated Anti Rust Tank | Made in India
  • Type: Storage Capacity 15 Litres Wattage 2000 Watts Pressure 8 bar BEE Rating 5 Star
  • Feroglas Coated Inner Container: This thick rolled steel tank is coated with feroglas which ensures high resistance against corrosion, making the water heater tough on hard water & giving them a longer life.
  • Mcoloy Heating Element: It offers faster heating & superior performance with its excellent resistance to corrosion against hard water conditions, thus extending life span of heating element.
  • High working pressure 0.8MPa: Suitable for high rise buildings. The multi-function valve prevents pressure to increase beyond 8 bar
  • Energy Saving High Density PUF insulation: CFC free thicker PUF insulation offers complete protection against radiant heat loss, reduces energy consumption and provides higher energy efficiency
AO Smith Geyser 15 Litre 5 Star BEE Rating | 2KW | Storage Water Heater With 2X Corrosion Resistant Blue Diamond Glass Tank | Warranty: 7 Yr Tank, 3 Yr heating element & 2 Yr Overall | VAS PLUS 15L
  • DOUBLE PROTECTION FOR SAFETY: Enjoy ultimate peace of mind with this AO Smith 15-litre water geyser. It features a factory-set thermostat, multi-function safety valve, and thermal cut-out, ensuring safe and reliable hot water for your bathroom every day.
  • DURABLE & ELEGANT DESIGN: This AO Smith 15-liter water geyser is crafted with a glossy ABS plastic body and blue diamond glass-lined tank for 2X corrosion resistance, making it the best 15L storage water heater for style and durability.
  • ENERGY-EFFICIENT 5-STAR GEYSER: Save on electricity bills with this BEE 5-star rated 15-litre geyser. Perfect for eco-conscious homes, this water heater ensures efficient heating while reducing energy consumption, making it a top choice in India.
  • BUILT FOR HIGH-PRESSURE USE: This AO Smith 15-liter storage water geyser can handle up to 8 bars of pressure, making it ideal for high-rise apartments or hard water areas. Enjoy uninterrupted hot showers without compromising performance.
  • LONG-LASTING WARRANTY COVERAGE: With a 7 year warranty by AO Smith on the inner tank, 3 year warranty on the heating element and 2 years comprehensive warranty by AO Smith, this AO Smith 15 litre water heater offers unparalleled after-sales support for peace of mind.
Havells All New Adonia Spin 25L 5 Star Storage Water Heater(Geyser)|Faster Heating|Safe to use|Saves electricity|Feroglas Coated Anti Rust Tank| Temp. setting knob|7 Yr. Tank Warranty| Made In India
  • Type: Storage Capacity 25 Litres Wattage 2000 Watts Pressure 8 bar BEE Rating 5 Star
  • Feroglas Coated Inner Container: This thick rolled steel tank is coated with feroglas which ensures high resistance against corrosion, making the water heater tough on hard water & giving them a longer life.
  • Incoloy Glass Coated Heating Element: It offers faster heating & superior performance with its excellent resistance to corrosion against hard water conditions, thus extending life span of heating element.
  • High working pressure 0.8MPa: Suitable for high rise buildings. The multi-function valve prevents pressure to increase beyond 8 bar
  • Temperature setting knob: The temperature setting knob lets users adjust temperature to their comfort level, ensuring personalized warmth and energy-efficient usage.
Racold Buono Pro NXG 15L ABS Body 5 Star Water Heater (Geyser) – 7 Yrs Tank Warranty, Corrosion Prevention With Superior Titanium Enameled Tank Coating, Suitable for Buildings, for elegant aesthetics
  • TITANIUM PLUS TECHNOLOGY: Titanium enamel coating in the tank prevents corrosion by handling toughest water conditions, providing reliable and healthy water for years.
  • PUF INSULATION: An eco-friendly insulation that retains hot water longer, saving energy.
  • MAGNESIUM ANODE: The water heater features a bigger anode that prevents corrosion of the inner tank, extending its lifespan
  • RUST PROOF BODY: Prevents corrosion, eliminating any chance of rust and ensuring a longer lifespan.
  • SAFETY PLUS: This storage water geyser features enhanced protection with 3 layers of safety with a thermostat, cutout, and safety valve for a worry-free bathing experience .

Do remember you can yourself insulate water heater too as properly insulating the tank of your electric water heater can help reduce heat loss. You can insulate the tank with a water heater blanket or jacket, and insulate hot water pipes to prevent heat loss while water travels from the tank to the faucets.