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.

Longway Vesta 5.5 Ltr 5 Star Rated Instant Water Heater for Home with Advanced Multi-Layered Safety System & Anti-Rust Coating |Suitable for Kitchen & Bathroom | 5 Year Warranty (Gray, 5.5 Ltr)
  • DURABLE STAINLESS-STEEL TANK FOR EXTENDED LIFESPAN: Built with high-grade stainless steel, this water heater offers long-lasting durability, ensuring endless hot water supply. Its heavy-duty copper heating element ensures rapid heating, providing hot water whenever you need it.
  • ENHANCED SAFETY FEATURES: This water heater features a robust polymer body that is both shock-proof and rust-resistant, ensuring long-lasting durability and safety and designed to withstand pressures up to 8 bars, this instant geyser is ideal for use in both low-rise and mid-rise buildings.
  • SUPERIOR HEAT RETENTION: Featuring premium Glass Wool Insulation, this water heater retains heat for longer periods, so you can enjoy hot water whenever needed.
  • USER-FRIENDLY WITH NEON INDICATORS: This water heater comes with convenient neon indicators to show power and heating status, and it includes a moulded 3-pin plug for optimal load efficiency.
  • WARRANTY PERIOD: 1 Year Limited Domestic Brand Warranty on Product & 5 Years on Inner Tank/Container. Enjoy the hassle free warranty by Longway on your product.
Bajaj Shield Series New Shakti 25L Vertical Storage Water Heater For Home| 5-Star Rated Geyser| Multiple Safety Systems| For High Rise Buildings| 10-Yr Tank 6-Yr Element 4-Yr Product Warranty 【White】
  • ✅ Free Installation and Free Inlet pipes worth Rs.600 by brand.
  • ✅ 【Type】: Storage Water Heater/Water Geyser, Capacity: 10 Litres, Wattage: 2000 Watts The rated voltage is 230 volts, and the frequency is 50 Hz
  • ✅ 【Warranty】: 10 Year Tank Warranty, 6 Year Heating Element Warranty & 4 Year Product Warranty by Bajaj
  • ✅ 【Build To Last With Glassline Inner Tank, Titanium Armour Technology & Magnesium Anode For Zero Erosion】: These technologies prevent corrosion & rusting of the geyser inner tank and helps to fight hard water Results in long tank life
  • ✅ 【Temperature Control】: Set the temperature of water as desired with the help of Adjustable Thermostat knob
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 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.
V-Guard Zio Instant Geyser 5 Ltr Wall Mount Water Heater|Advanced Multi-Layered Safety|3000 W Powerful Heating|Strong Stainless Steel Tank|Suitable For Kitchen&Bathroom|White-Blue
  • POWERFUL INSTANT HEATING: V-Guard Zio 5 Litre is powered by a superior 3 kW heating element with a copper sheath and high-grade magnesium oxide insulation for quick movement of heat
  • ADVANCED 4 LAYER SAFETY: Pressure release valve for safer operations at higher pressures, ISI marked thermostat for cutting off power supply when temperature exceeds 55°C, Overheating protection through disc type snap action safety device operating at 90°C & Anti-siphon Protection for preventing the reverse flow of water
  • STYLISH & ENERGY EFFICIENT : This Instant Water Heater maintains maximum heat retention with eco-friendly insulation and has an stylish colour display panel indicating the status of heat and power
  • HIGH DURABILITY: Robust Inner Tank of Zio is made of high-grade 304 Stainless Steel | Rust-proof high-quality engineering polymer constitutes the Outer Body, preventing rust formation
  • WARRANTY: V-Guard Zio has a warranty of 2 Year on Product, 2 Year on Heating Element and 5 Year on Inner Tank
Longway Superb 15 Ltr 5 Star Rated Automatic Storage Water Heater for Home, Water Geyser, Water Heater, Electric Geyser with Multiple Safety System & Anti-Rust Coating (Gray, 15 Ltr)
  • Type: Storage, Capacity: 15 Liters, Wattage: 2000 Watts, Pressure: 8 Bars, BEE Rating: 5 Star Rated Energy Efficient Geyser, Inner Tank Material: Stainless Steel (SS) Tank with special Anti-Rust coating – 2X Corrosion Resistance, Outer Body Material: Metal (CRCA).
  • Highest Saving: BEE 5-star rated with Advanced heat resistant Technology for Power Savings. Perfect if you want to go green. Quality check: 5 safety functions and 15 Quality checks by a team of professionals to ensure the best product for you. Extra heavy duty element for extra heating & durability.
  • Product Features: Superior polymer coated tank, nano poly bond technology for excellent corrosion resistance and oxidation resistance even in high temperature and pressure 100% ISI Marked & BIS approved Copper Heating Element to ensure powerful heating.
  • Package Content: Electric Geyser, Instruction Manual.
  • Warranty Period: 1 Year Limited Domestic Brand Warranty on Product & 5 Years on Inner Tank/Container. Enjoy the hassle free warranty by Longway on your product.
V-Guard Divino DG Geyser 15 Litre Water Heater for Home | Digital Display | 5 Star Rating | Vitreous Enamel Coating | Advanced 4 Layer Safety | Suitable for Hard Water & High-rise Building | White
  • 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
Racold Buono Pro NXG 15L Water Heater (Geyser) – ABS Body, Free Installation & Pipes, 5 Star Rated, 5 Years Warranty on Tank, Titanium Coating, Vertical Storage Geyser for Bathroom, 3 Safety Levels
  • 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 .
Havells Adonia Spin 25-Litre Vertical Storage Water Heater (Geyser) White Blue 5 Star, Vertical Mounting
  • Type: Storage ; Capacity: 25 Litres; Wattage: 2000 Watts; Pressure: 8 Bars ; BEE Rating: 5 Star;Waterproof Degree : IPX-4 Protection for longer product life
  • Temperature Sensing Color changing LED Ring Knob to indicate the real-time hotness of the water
  • Feroglas Tech with single Weld Design : Made of ultra thick superior steel, Provides superior corrosion resistance & anti-rust property resulting in longer life, Tough enough to withstand high pressure rating (8 bars) ideal for high rise building
  • Heating Element : Incoloy glass coated heating element offers superior heating performance with its excellent resistance to both oxidation and carbonization at high temperature setting and resists corrosion against extreme and hard water conditions
  • The tank has an anode rod with a stainless steel core that is designed to protect the tank from corrosive elements . The system uses special catalyst action to fight the corrosive elements which in turn prolongs the life of the water heater

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.