The 3kW heating element is standard for instant geysers in India, but you should check the type and material of the heating element. Incoloy or copper heating elements are known for their durability and efficiency. Otherwise glass coated heating elements are the best. Only AO Smith provide glass coated heating element in Instant geysers in India.

Instant geyser must have safety features like a thermostat to prevent overheating and a pressure relief valve to release excess pressure. As the 3kw is considered high power which put a lot of load on wiring of the house specially old houses with decade old wiring. An ELCB inbuilt instant geyser are also need of the hour to avoid electric shock. Better to connect elcb plug/top separately to geyser.

Bajaj Splendora 3L 3KW Vertical Instant Water Heater for Home | Geyser for Bathroom & Kitchen | High Grade SS Tank | Copper Heating Element | 5 Years Tank Warranty by Bajaj【White】
  • ✅ Free Installation and Free Inlet pipes worth Rs.600 by brand.
  • ✅ ABS outer body with SS tank
  • ✅ Copper heating element with efficient longer life
  • ✅ Suitable for 6 bar pressure
  • ✅ Unique Weld free joint in outer metal body
Racold Pronto Pro 3L 3KW Vertical Instant Water Heater (Geyser) | Faster Heating | Suitable for High Rise Buildings | Italian Design|3 Levels of Safety|Convenient for Kitchen & Bathroom Applications
  • PUF INSULATION: the dense and thick insulation in the tank effectively retains heat, improving energy efficiency and lowering electricity costs
  • FASTER HEATING: the high-capacity heating element ensures rapid access to hot water
  • AUTO CUT OFF: the stem-type thermostat and cutout feature provide automatic temperature control and added safety for your water heater
  • NO BACK FLOW: the anti-syphoning system prevents water from flowing back into the container, thus avoiding dry heating
  • HIGH PRESSURE RESISTANCE: the water heater has high pressure withstanding capacity, which makes it suitable for high-rise buildings and high pressure pump applications
Racold Altroi+ 3L 3KW Vertical Instant Water Heater (Geyser) White with Free Standard Installation & Pipes Smart LED Ring Free Electric Plug Convenient 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
  • Components: Includes product, warranty manual & warranty card. Inlet and outlet pipes are not included in the product box – they will arrive at the time of installation with a Racold technician at no added cost.Free Installation & Pipes are not available in the following states: Sikkim, Odisha, Uttarakhand, Himachal Pradesh, Uttar Pradesh, Bihar, Jharkhand, Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura. For any queries or assistance, please contact Racold Customer Care.
Racold Svelto 3L 3KW Vertical Instant Water Heater(Geyser) White | Free Electric Plug | Faster Heating |3 Levels of Safety |Italian Design| Convenient for Kitchen & Bathroom Applications
  • High Pressure Resistance: Your water heater has high pressure withstanding capacity, which makes it suitable for high-rise buildings and high pressure pump applications
  • 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
  • Faster Heating: The high power heating element ensures you get hot water in minimum time
  • Anti-Siphon : The back flow of the water from cold inlet pipe is prevented by anti-siphoning system from inner tank of the water heater,Avoids dry-heating incase of no or less water inside inner tank due to back flow of water
  • Rust Proof Body : This water heater have rust proof body to prevent corrosion leaving no room for rust, ensuring, also its longer life Improves aesthetics in the bathroom
Black+Decker Galerus Geyser 3 Litre | Instant Water Heater for Home & Kitchen | 3KW | High Grade Stainless Steel Tank I Copper Sheathed Heating Element I 5 Year Tank Warranty | Water Geyser White
  • ★【3L Compact Capacity】: Ideal for kitchens and small water usage areas.
  • ★【3KW High-Speed Heating】: Ensures instant hot water with superior efficiency.
  • ★【Stainless Steel Tank】: Built with high-grade stainless steel for long-lasting durability.
  • ★【Copper Sheathed Heating Element】: Offers rapid heating and corrosion resistance.
  • ★【5-Year Tank Warranty】: Guaranteed durability with extended tank warranty.
Goldmedal Insta24 3Liters 3Kw Instant Geyser (Water Heater) With Faster Heating| Preset Thermal Cutout| Stainless Steel Tank Rust Proof| Dual Colour LED Indicator|(White-Silver)
  • In a world that’s rapidly gravitating towards the instant, embrace the moment with Insta 24, our premier instant water heater.
  • Its elegant design effortlessly merges with modern interiors, while its pre-calibrated thermostat ensures precise temperature control.
  • Equipped with a pressure release valve, Insta 24 is not just about speed, but also safety and sophistication.
  • This water heater comes with Pressure Release Valve, Preset Thermal Cutout, Superior Grade Stainless Steel Tank.
  • Additional Features: Pre-Calibrated Thermostat, Fire Retardant Power Cord & Dual Colour Led Indicator.
Bajaj Shield Series Skive Plus 5L 3KW Instant Water Heater For Home|Star Rated Geyser For Bathroom & Kitchen|Rust Proof|Stainless Steel Tank|4-Yr Product 6-Yr Element 2-Yr Tank Warranty|White
  • Tank Durability: DuraAce tank with marine-grade glassline coating ensures longevity and corrosion resistance. Heating Element Efficiency: DuraCoat non-stick heating element for efficient performance and easy maintenance.
  • Temperature Control: DuraNte thermostat offers precise temperature adjustment for comfort. Surge Protection: VoltagePro technology withstands 4.5KW surge voltage for safety.
  • Robust Construction: Unique weld-free joint technology and pre-coated metal body for durability. Enhanced Efficiency: Swirlflow technology delivers 20% more hot water* output.
  • Safety & Ease of Usage: Multiple safety systems including magnesium anode, LED indicators, and fire retardant cable.
  • High-Rise Compatibility: Suitable for high-rise buildings, capable of withstanding 6 bar pressure.
NEXOMS Cup Type Heating Element ISI Marked 3KW Compatible for 3 Litre – 6 Litres Instant Geysers
  • Tube Material: Anti-Corrosive Copper
  • Power: 3KW
  • Heavy Quality ISI Marked Element
  • Compatible for Portable Geysers and Instant Geysers 3 Litre to 6 Litres
Havells Instanio 3L Instant Water Heater(Geyser)| Temp. Sensing LED Indicator| Rust & Shock Proof Body| ISI Marked|Warranty: 5 year on Inner Tank| High Rise Compatible (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

Another thing to check is pressure bar capacity of inner tank specially if you like high rise buildings as water pressure can be much more for tank to withhold. You can also consider 4.5kw instant geysers if the house is fairly new with new wiring.