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 6-L 5 Star Rated Storage Water Heater with Advanced 3 Level Safety (White)
  • PRODUCT: Crompton’s energy efficient storage water heater with fast heating
  • TECHNICAL SPECIFICATIONS: Wattage: 2000 W; Capacity: 6L; Star Rating 5; Pressure 8 bar
  • 3 LEVEL SAFETY: Capillary Thermostat, automatic thermal cut-out & multi-functional valve to provide higher safety
  • ANTI-RUST: Fitted with specially designed magnesium anode which prevents corrosion due to hard water quality
AO Smith HSE-SHS-015 Storage 15 Litre Vertical Water Heater (Geyser) ABS Body BEE 5 Star Superior Energy Efficiency|Enhanced Durability Blue Diamond Glass Lined Tank |Suitable High Rise Buildings
  • Type : Storage ; Capacity 15 Liters, Wattage 2000 Watts; Pressure : 8 bars Factory set thermostat – Max 75C Double Protection with Thermal Cut-Out and Multi-function Safety Valve
  • Outer Body – ABS Plastic – superior glossiness and surface finish. Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance
  • Warranty: 5 years on inner tank, 2 years warranty on glass coated heating element and 2 years comprehensive
  • BEE 5 Star rated for Maximum energy savings
Bajaj Shield Series New Shakti 25L Storage Water Heater For Home|5-Star Rated Geyser|Multiple Safety Systems|Non-Stick Heating Element|20% More Hot Water*|For High Rise Buildings|4-Yr Warranty|White
  • TYPE: Storage Water Heater/Water Geyser, Capacity: 25 Litres, Wattage: 2000 Watts. The rated voltage is 230 volts, and the frequency is 50 Hz.
  • WARRANTY: PRODUCT WARRANTY By Bajaj – 1 year. Tank Warranty by Bajaj – 5 years. Heating Element Warranty by Bajaj – 2 years.
  • 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.
  • ENERGY EFFICIENT with SWIRL FLOW TECHNOLOGY – ENSURES 20% MORE HOT WATER; PUF INSULATION – Traps the heat inside the tank, to keep water hot for longer period, thanks to the Polyurethane foam inserted between the outer and inner shells of water geyser body.
V-Guard Divino DG 5 Star Rated 15 Litre Storage Water Heater (Geyser) with Digital Display and Advanced 4 Level Safety, 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
Crompton Solarium Care 15-L 5 Star Storage Water Heater (Geyser) with Rust Proof Plastic Body (White),Free Installation, Free Pipe.
  • PRODUCT: Crompton’s 5 star rated storage water heater with a powerful heating element and glassline Coated tank along with customised bath modes and Color Changing LED Indicator
  • CUSTOMISED BATH MODES: Solarium Care offers bathing modes like Baby Care, Hair Care & Hygiene Mode for a customised bathing experience.
  • 3 LEVEL SAFETY: Capillary Thermostat, automatic thermal cut-out & multi-functional valve to provide higher safety water heater
  • RUST PROOF PLASTIC BODY GEYSER: Featuring a rust-proof plastic body and a superior glass line coated tank which ensures durability and longevity Geyser.
  • WARRANTY: 7 year warranty on Tank, 3 year warranty on Element and 2 year warranty on Product provided by Crompton from date of purchase
Crompton Gracee 5 Litres instant water heater with 4 Level Advance Safety | 3000W fast heating element | Rust proof Body | 5 years tank warranty | 2 years element warranty
  • PRODUCT: Crompton’s 5L instant water heater with fast heating function
  • TECHNICAL SPECIFICATIONS: Wattage: 3000W; Capacity: 5L; Pressure 6.5 bar
  • WARRANTY: 5 year warranty on Tank, 2 year warranty on Element and 2 year warranty on Product provided by Crompton from date of purchase
  • 4 LEVEL SAFETY: Steam Thermostat, automatic thermal cut-out, pressure release valve and a fusible plug to ensure complete safety.
  • ANTI-RUST: Rust free PP body along with a weldless tank design that enhances resistance to corrosion and ensures long life
Racold BUONO PRO NXG Storage Water Heater 25L – Free Standard Installation & Pipes, 5 Star Rated, ABS Body Vertical Geyser for Bathroom,3 Safety Levels, Rust Proof Body with Titanium Coating, White
  • TITANIUM PLUS TECHNOLOGY: Buono Pro NXG water heater has a superior durability thanks to its specially designed titanium steel tank which helps to resist pressure and water impurities
  • SMART GUARD: Buono Pro NXG has a special anode which performs an electrolytic process which protects the heating element from corrosion
  • RUST PROOF BODY: Buono Pro NXG is specially designed to make it rust free, increasing his life
  • SAFETY PLUS: 3 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
  • HIGH PRESSURE RESISTANCE: the water heater has high pressure withstanding capacity, which makes it suitable for high-rise buildings and high pressure pump applications
AO Smith SDS-GREEN -025 Storage 25 Litre Vertical Water Heater (Geyser) ABS Body|BEE 5 Star Superior Energy Efficiency|Enhanced Durability w/ Blue Diamond Tank Coating|Suitable High rise Buildings
  • 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
  • Glass-Coated Heating Element to prevent scale formation and extend the life of heating element
Crompton Solarium Qube 15-L 5 Star Rated Storage Water Heater (Geyser) with Free Installation and Connection Pipes (White and Black)
  • PRODUCT: Crompton’s energy efficient storage water heater with corrosion resistant body
  • 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
  • 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
Longway Superb 25 Ltr 5 Star Rated Automatic Storage Water for Home, Water Geyser, Water Heater, Electric Geyser with Multiple Safety System & Anti-Rust Coating | 1-Year Warranty | (Gray, 25 Ltr)
  • Type: Storage, Capacity: 25 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 Savings : 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.

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.