Electrocution-Proof Electric Storage Water Heater

Sigma Tank

An insulated cylinder tank that heats water, stores heated water at a controlled temperature and delivers the hot water when it is needed. The tank comes with different storage sizes to fulfil varied requirements in the commercial and residential markets. It is featured with a powerful electric heater, high quality and reliable Pressure and Temperature Safety Devices to supply a smooth and enjoyable hot water usage at your convenience.


 Key Features

Electrocution Prevention


Pre-installed with isolation barrier to prevent electrocution caused by current leakage

Exclusive Single Welded Line


Inner storage tank with single welded line that helps to reduce more than 67% of water leakage risk.

Blue Diamond Inner Tank


A high efficiency inner tank with anti-rust coating that prolongs the product lifespan with 5 years warranty.

Product Advantages

Multi-layered Safety Protections

Protect users from over-temperature, over-pressure, water refluence and dry heating.

Excellent Corrosion Resistance

Incoloy 840 heating element is a high nickel based superalloy, designed for excellent corrosion resistance and able to withstand dry burn. In addition, Magnesium anode is also pre-installed to purify water to prevent corrosion of heating element.


The tank is featured with 20mm of CFC-free Polyurethane insulation to maintain water temperature overnight. Therefore, it helps to save energy consumption with minimum heat loss. 

Double Action Thermostat

The Double Action Thermostat provides two cut-out points to ensure users safety. The first thermal cut-out when there is over-heating, thus protects user from scalding risk. The second thermal cut-out terminates the power supply under abnormal conditions, when the temperature falls at above 90ºC.