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 10-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: 10L; 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
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
  • 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
  • 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
POLYCAB Celestia 5-Star 15L Water Heater (Geyser) | Free Installation | 5-yr tank & 2-yr product warranty | Temperature Control Knob | Enhanced Safety, Rust Proof Tank | Efficient Heating【White】
  • ✅【5 Star Energy Rating】This energy efficient product comes with a 5-Star energy rating by BEE, Govt of India which helps save you electricity bills.
  • ✅【Ultra Diamond Glasslined Coated Tank】The storage tank has an inner glasslined coating that make it corrosion-free and also helps withstand high pressure applications
  • ✅【Efficient Heating Element】Experience instant hot water with the highly efficient heating element.
  • ✅【Durable Engineered Plastic Body】Our Water Heaters boasts a rust-proof engineered plastic body that ensures prolonged durability.
  • ✅【Enhanced Safety Measures】Polycab, known for its core value of Safety with its other electrical categories, incorporates advanced safety standards and internal fire retardant cables for unparalleled protection of your family.
Crompton Gracee|5L|3000-Watts Powerful Heating|Electric Instant Water Heater (Geyser) for home|High Grade SS Tank with Advanced 4 Level Safety|Rust-Proof|Premium Black|Wall Mounting
  • Premium Finish Rust Proof Outer Body: High quality polymer engineering that prevents outer body from rusting
  • Food Grade Inner Tank: 304 Grade Stainless Steel Inner Tank; also suitable to be used in the kitchen
  • Powerful Heating: 3000-Watts Copper Heating Element for 33% faster heating
  • 4-Level Safety: Thermostat, automatic thermal cut-out, pressure release valve and a fusible plug to ensure complete safety
  • Withstands a pressure of 6.5 Bar: Suitable for high rise buildings and pressure pump applications
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.
Havells Instanio Prime 25 Litre Storage Water Heater | Color Changing LED Ring Indicator, Feroglas Coated Tank | Warra: 5 Year on Tank, Protective Anode Rod, Heavy Duty Heating Element | (White Blue)
  • Colour-changing LEDs that change from blue to amber to indicate the hotness of the water
  • It is made of ultra-thick super cold rolled steel plates that provides higher resistance to corrosion resulting in longer life than standard inner tank designs
  • Heavy Duty Heating Element for high performance & Quick heating
  • Suitable for high-rise buildings and pressure pump applications. The multi-function valve prevents pressure to increase beyond 8 bars
  • It avoids direct contact between cold and hot water flow for faster heating and optimized energy saving resulting in 20 % more hot water output
AO Smith HSE-SHS-015 Storage 15 Litre Vertical Water Heater (Geyser) ABS BEE 5 Star Superior Energy Efficiency Enhanced Durability Blue Diamond Glass Lined Tank, High Rise Buildings, Wall Mounting
  • 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
Orient Electric Enamour Classic Pro| 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.
Bajaj Skive 5 Litre Instant Water Heater for home| High Grade SS Tank| Multiple Safety System| Suitable for High Rise| Shock Resistant| Rust Proof Outer| 5-Year* Tank Warranty by Bajaj |White
  • TYPE: Instant Water Heater/Water Geyser, Capacity: 5 Litres, Wattage: 3000 Watts, Voltage: 230V, Frequency: 50Hz
  • WARRANTY: PRODUCT WARRANTY By Bajaj – 2 years. Inner Tank Warranty by Bajaj – 5 years. Heating Element Warranty by Bajaj – 3 years.
  • THERMOPLASTIC BODY: Rust Proof and Shock Resistant outer body
  • ASSURED SAFETY – It comes equipped with a 4-in-1 multifunctional safety valve and a fire-retardant water heater cable. Thus, this product comprises of MULTIPLE SAFETY SYSTEMS to safeguard against dry heating, overheating and excess pressure.
  • LED INDICATOR: The green and red light helps indicating power on and heating function
Havells Instanio 3 Litre Instant Water Heater | Color Changing LED Indicator, Rust & Shook Proof | SS Tank, ISI Certified, Warranty: 5 year on Inner Container ; 2 year comprehensive | (White Blue)
  • LED Indicator: Colour-changing LEDs that change from blue to amber to indicate the hotness of the water
  • Outer Body: Rust and shock proof ABS outer body for long life
  • Inner Tank: Stainless steel inner tank of 304 grade
  • Power Cord: Fire retardant power cord for maximum safety
  • 0.65 MPa Bar Pressure: Suitable for high rise buildings and pressure pump applications

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.