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.

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
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 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
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
Bajaj Edrea 15 Litre Storage 5-Star Rated Storage vertical Wall Water Heater for home | Polymer Coated Tank | Multiple Safety* | Suitable for High Rise | Child Safety Mode | 5-Yr* Warranty 【White】
  • ✅ Bajaj Edrea Water Heater comes with multiple safety system and Child safety mode
  • ✅ The product tank is Polymer coated and designed to withstand 8 bar pressure. It has a PUF insulation
  • ✅ Bajaj Edrea Water Heater has powder coated metal body, Thermostat knob for temperature setting and magnesium node
  • ✅ The product comes with efficient and long-life heating element
  • ✅ Bajaj Edrea Water Heater has a Fire-retardant cable with 16A plug
Racold Altroi+ DN 6L 3KW Vertical 5 Star Instant Water Heater (Geyser) White, with Free Standard Installation & Pipes | Smart LED Ring|Free Electric Plug| for Kitchen & Bathroom, Wall Mounting
  • High Pressure Resistance: Your water heater has high pressure withstanding capacity, which makes it suitable for high-rise buildings and high pressure pump applications
  • Temperature Regulation Knob: An easy control knob through which you can regulate heating of water as per your requirement
  • Safety Plus: Three levels of safety against high temperature and pressure, provided by a hightech adjustable thermostat, cut-out and multi function safety valve according to international standards
  • Customized Application : It’s a unique, novel and first of its kind feature in the Instant water heater segment helps you in optimizing water heater usage . You can select ‘KITCHEN’ or ‘BATHING’ mode based on the intended hot water application
  • Smart LED Ring : The Smart LED Ring range senses when hot water is ready for bath, or other application and notifies user by changing LED color from blue to red
AO Smith Geyser 25 Litre 5 Star Rating (BEE), Vertical Water Heater | Geyser 25 Ltr For High Rise Building | 7 Year Tank Warranty, 2 Year Comprehensive Warranty | SDS-GREEN-025
  • Blue Diamond Glass-Lined Tank for 2X corrosion resistance
  • Long-lasting Anode Rod a customised alloy that works even in hard water conditions to protect the tank and has 2X lifespan as compared to normal magnesium rod.
  • Installation: Water Heater Free Installation is applicable up to municipal city limit of Bangalore, Chennai, Hyderabad, Secunderabad, Pune – PCMC, Delhi, Noida, Faridabad, Ghaziabad, Gurgaon, Kolkata, Howrah and Hooghly. Free Installation does not include any additional material e.g. connecting hoses, water inlet & outlet, pipe nipples, any additional material, electrical fittings & Demounting* of old geyser etc. In rest of the cities, installation will be provided by the brand against the installation charge of INR 400
  • Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance; Outer Body Material: ABS, Temperature Control Knob Easy temperature settings
  • Glass-Coated Heating Element to prevent scale formation and extend the life of heating element
Longway Superb 10 Ltr 5 Star Rated Automatic Instant Water Heater for Home, Water Geyser, Water Heater, Electric Geyser with Multiple Safety System & Anti-Rust Coating (Gray, 10 Ltr)
  • Type: Instant, Capacity: 10 Liters, Wattage: 2000 Watts, Pressure: 6.5 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.
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.

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.