Gen 1 Heater

$539.00$1,255.00 Inc. GST

The Gen 1 Heater prioritises efficiency and savings without compromising on performance.

Saves Energy, maintains hot water for 12 hours without reheating.

Incredible Durability with Patented Blue Diamond tank. Record lifespan of 33 years in Singapore, far over the 5-year average.

High Heating Efficiency with Blue Diamond elements. Fast, high heat even after a decade of use.


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Gen 1 Heater, HDB BTO
Gen 1 Heater, HDB Resale
Gen 1 Heater, Condo, Private

Gen 1 Reviews

The water heaters sold by AOS Bath are of superb quality. You can tell just by the looks of it. Moreover the glass coating on their heating element & tank; ‘Blue Diamond‘, helps reduces the amount of scale build-up over time.

I’ve bought their 30L ‘ELJH-30’ water heater back in July 2021. Even though the price can be seen as slightly higher than most other brands out there, I genuinely and truly believe it’s money worth spending.

M’Izz Afig Bmr
Google Review

My previous heater was also an AO Smith, and it lasted more than 15 years. Just installed the new heater today. Messrs Kalam and Mahadi did a very professional job with the wiring and piping. I hope that this new heater will also last as long.

Fook Hou Lee
Google Review

I wish to add that this brand is superb reliable and lasting. The current 72L is a vertical model which has been discontinued and replaced by horizontal model, has been in use for more than 30 years, and never failed me once. The job done by Kalam and Rana team was impeccable. I can tell that they are very experienced in what they do.

Everything was done to my satisfaction including a thorough cleaning of the bathroom before they left. AOS Bath is highly recommended.

P Chong
Google Review

Gen 1 FAQ

How do I use the heater?
Residential use
  • Fixed operating temperature of 65-70ºC
  • Switch on 15 min before use
  • Power off after use

There is a dial on the right side of the tank. It will light up when heating is in progress.

Temperature control ranges from 60-70 degrees. Users in Singapore are advised to turn knob clockwise fully for heater to heat well.

AosBath provides the longest full onsite warranty for water heaters in Singapore.

This a zero out of pocket cost, onsite warranty and not a partial warranty. The warranty will cover you for three years on transport, parts, and labour.

The most popular size is 40 litres for a family of up to 4 people. 

For more information on how to size your tank, refer to this Sizing Guide

This gauge is not marked or calibrated and only shows an approximate reading of whether there is hot or cold water in the tank.


Gen 1 wiring specification and illustration.
Gen 1 wall mount specification and illlustration.
Power (kW) 2.0-2.2
Voltage/frequency (V/Hz) 220~230 / 50
Temperature range (°C) 35 – 75 ± 5
Rated water pressure (MPa) 0.8
Waterproof grade IPX4
Capacity (litres)30 lit40 lit50 lit80 lit100 lit
Length (mm)6057108308601025
Width (mm)360360360463463
Height (mm)360360360463463
Weight (kg)1719213135