Lets compare the water heater also known as geyser in India of both AO Smith and VGuard.

This difference is basically for storage water heaters and we expect almost similar features in instant water heaters too. You can read the difference highlighted in the table below:

FeaturesAO Smith Water HeaterVguard Water Geyser
Inner Tank ProtectionBlue Diamond glass lined tank with magnesium anode rodAdvanced Vitreous Enamel Coating with Sacrificial Magnesium Anode rod
Heating ElementIncoloy element with glass coatingIncoloy 800 element
Outer TankCorrosion-resistant powder coat mild steelCorrosion-resistant powder coat mild steel
Warranty2 yr comprehensive
3 yr heating element
7 yr tank warranty
2 yr comprehensive
3 yr heating element
5 yr tank warranty
Temperature AdjustmentTemperature Control Knob from 25-75°CTemperature Control Knob from 25-75°C
Here AO Smith geysers offer better heating element protection and tank warranty, rest everything seems same. Few good AO Smith Deals to check below ….
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
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
AO Smith SGS-GREEN-006 Storage 6 Litre 3KW Vertical Water Heater (Geyser) White Express Heat 5 Star
  • Type: Storage ; Capacity: 6 Litres; Wattage: 3000 Watts; Pressure: 8 Bars ; BEE Rating: 5 Star;
  • Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance; Outer Body Material: ABS
  • Product Dimensions: 31.7 Cms X 31.7 Cms X 25.8 Cms
  • Warranty: 7 years on inner tank, 2+2* years extended warranty on glass coated heating element and 2 years comprehensive
  • Included in the box: 1 Vertical Storage Water Heater, User Manual , Mounting Screws
A.O. Smith EWS-5 White | 5 Litre 3KW Instant Water Heater (Geyser) with shock proof Outer Body |5 Levels safety shield |Made for Kitchen and Bathroom Applications, Wall Mounting
  • Instant Geyser with Express Heating: Get instant hot water with a 3000-watt high-powered heating element.
  • Longer Life: Superior quality stainless steel tank provides the best protection against corrosion in hard water conditions.
  • 5-level safety shield for maximum protection: Auto Switch on/off- No overheating, Superior Quality Wiring U/L Rated wiring harness for added safety, Pressure relief valve Protection against high-pressure build up in the tank, ISI marked Power cord added safety, Rust Proof/ Shock Proof HIPS polymer outer body
  • Instant Geyser Suitable for high-rise buildings 6.5 Bar high-pressure rating with superior quality stainless steel inner tank.
  • Complete Peace of Mind with a 5-year warranty on the tank, a 2-year warranty on the heating element, and a 2-year warranty on the overall product, the water heater/ geyser comes protected against manufacturing defects. Dial our toll-free number to arrange hassle-free assistance at your doorstep. PAN INDIA SERVICE NETWORK: AO Smith Instant Water Geysers have a Pan India Service Network.
AO Smith HAS-X1-015-RHS Storage 15 Litre Horizontal Water Heater (Geyser)Rust-proof outer Body|Compact Size|Fits under false ceilings|Suitable- High-rise Buildings|8 Bar High Pressure rating
  • Type: Storage-RHS model ; Capacity: 15 Litres; Wattage: 2000 Watts; Pressure: 8 Bars ; BEE Rating: 4 Star
  • Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance; Outer Body Material: Metal
  • Product Dimensions: 50.9 cms X 33.8 cms X 33.8 cms
  • Warranty: AO Smith 7 years warranty on inner tank, 2+2* years extended warranty on glass coated heating element and 2 years comprehensive
  • Included in the box: 1 Horizonatal Storage Water Heater, User Manual , Mounting Screws
AO Smith HeatBot Wifi 15L Silver | Smart Storage Vertical Water Heater (Geyser) with Free Installation | Voice & Smart App Control | Personalised Modes & Scheduler | Digital Touch Display
  • Type: Storage ; Capacity: 15 Litres; Wattage: 2000 Watts; Pressure: 8 Bars ; BEE Rating: 3 Star;
  • Superior Technology : HeatBot Wifi Water Heater (Geyser) has superior durability with patented Blue Diamond Glass Lined tank it reduces scaling accumulation & corrosion on the tank caused due to hard water. Long-lasting Protection: Customized alloy Anode offers 2X lifespan in comparision to ordinary geyser.
  • Energy Efficient: Save on electricity bills with advanced PUF insulation, which retains heat effectively
  • Elegant Design: Digital Touch Display & Durable shock proof ABS plastic body with a sleek, modern look.
  • Smart Modes with options of Bucket Bath, Shower, Pedicure, Washing and Mopping enable you to personalise your hot water requirements as you like it and saves electricity with intelligent functions. Warranty: 7 years on tank, 2 years on product, and 2 + 2 years (extended warranty) on heating element.
AO Smith HeatBot-SZS-025-DG- SILVER Storage 25 Litre Vertical Digital Display Remote Controlled Water Heater (Geyser) Silver - 4 Star
  • Type: Storage ; Capacity: 25 Litres; Wattage: 2000 Watts; Pressure: 8 Bars ; BEE Rating: 4 Star;
  • Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance; Outer Body Material: ABS
  • Product Dimensions: 48.6 cms X 44.4 cms X 40.8 cms
  • Warranty: 7 years on inner tank, 2+2* years extended warranty on glass coated heating element and 2 years comprehensive
  • Included in the box: 1 Vertical Storage Water Heater, Wireless Remote, User Manual , Mounting Screws
AO Smith HeatBot-SZS-025 - SILVER Storage 25 Litre Vertical Water Heater (Geyser) Silver - 4 Star
  • Type: Storage ; Capacity: 25 Litres; Wattage: 2000 Watts; Pressure: 8 Bars ; BEE Rating: 4 Star;
  • 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
  • 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
AO Smith SGS-PLUS-006 Storage 6 Litre Vertical Water Heater (Geyser) White Express Heat 5 Star
  • Type: Storage ; Capacity: 6 Litres; Wattage: 3000 Watts; Pressure: 8 Bars ; BEE Rating: 5 Star;
  • Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance; Outer Body Material: ABS
  • Product Dimensions: 31.7 Cms X 31.7 Cms X 25.8 Cms
  • Warranty: 7 years on inner tank, 2+2* years extended warranty on glass coated heating element and 2 years comprehensive
  • Included in the box: 1 Vertical Storage Water Heater, User Manual , Mounting Screws
AO Smith HeatBot-SZS-015-DG- SILVER Storage 15 Litre Vertical Digital Display Remote Controlled Water Heater (Geyser) Silver - 4 Star
  • Type: Storage ; Capacity: 15 Litres; Wattage: 2000 Watts; Pressure: 8 Bars ; BEE Rating: 4 Star;
  • Blue Diamond Glass-Lined Tank for 2X corrosion resistance
  • 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
  • Inner Tank Material: Blue Diamond Glass Lined Tank- 2X Corrosion Resistance; Outer Body Material: ABS
  • Product Dimensions: 40.8 cms X 39.5 cms X 37 cms

AO Smith is USA based global manufacturer of water heater only. That’s their specialty so obviously one can trust them with single thing manufacture and does it the best. Like the glass coated heating element was introduced to India by AO smith only.

Vguard is a Kochi KL based company which is more than 4 decades old. As the name suggests started as voltage stabilizer based co and later ventured into other products using it old reliable service network.