Square Digital Water Heater

The most compact digital water heater.
So precise. So easy to use.

Digital display and control

Realtime feedback on precise water temperature.
Program your water heater wirelessly to save up to 40% energy.


  • Temperature controls
  • Blue Diamond™ tank
  • Glass Lined element

Always know if you have enough hot water before you enter a shower.

Don’t run out of water

Program your water heater wirelessly to save over 40% of energy. Something basic heaters don’t allow you to do.

Learn more

This digital water heater monitors the amount of energy your family consumes.

So you have a good idea of how to save even more.

Blue Diamond Glass™ Technology

A. O. Smith water heaters are more durable than others.
They easily last over 10 years. Their patented Blue Diamond glass lining significantly reduces corrosion and scaling.

Glass Lining vs. Stainless Steel

Glass Lined Element

Increased corrosion resistance

HSE-SES-25 445 371 445
Product Specifications
Rated volume (L) 25
Power (kW) 2.0
Voltage/frequency (V/Hz) 230~/50
Temperature range (°C) 25 – 75 ± 5
Rated water pressure (MPa) 1.0
Inlet/outlet connection (inches) ¾
Waterproof grade IPX1
Net weight (kg) 16

Leading American Technology

A. O. Smith has been refining water heating technology for the last 140 years. Every A. O. Smith heater is equipped with cutting edge, patented technology. Other heaters may look like A. O. Smith heaters but they do not work the same way.

Built to Last

A. O. Smith’s patented Blue Diamond formula makes its water heater tanks the toughest and most durable tanks in the market.

The longest lasting heater in the world was made by A. O. Smith.

No OEM Factories

Other manufacturers use OEM factories so they can give you cheaper products, but every A. O. Smith water heater and its components are manufactured in-house.

3 year full warranty

Other heaters only provide full warranties for one year. All A. O. Smith products are fully guaranteed for 3 years – parts and labor, making us the longest water heater warranty provider in Singapore.

Square Digital Water Heater

Model: HSE-SES

  • 3 year full warranty
  • 5 year tank warranty