24 Jul 2024

Storage Water Heater Safety: Heater Isolator Switch Burned on Rheem EH86H-40 Water Heater at Kensington Square on 10 Jun 2024

The customer initially experienced no hot water from their storage water heater, followed by a power trip when the heater was switched on. Within its lifespan, the storage water heater had faced issues of no hot water and power tripping. These issues were likely caused by a faulty heating element or thermostat. During a site inspection, our licensed technician discovered a spoiled heating element. Further examination of the electrical connection revealed burn marks on the isolator, indicating a potential hazard. Although the existing isolator and wire sizing were correct, the problem stemmed from a loose wire connection. This loose connection posed a significant danger, including the risk of electrical fires, equipment damage, and potential harm to users. After the inspection, our Homeone team discussed the findings with the customer and proceeded to replace the rusty heating element and the burnt isolator with a new 20A isolator switch. This resolved the issues of no hot water and power tripping, ensuring compliance with LEW and PUB regulations for safety and reliability.

  • Project location

    Kensington Square

  • Property type

    Apartment

Storage Water Heater Safety-Rheem EH86H-40 Heating Element Replacement and Burned Isolator Replacement

Storage Water Heater Safety: Heater Isolator Burned on Rheem EH86H-40 Water Heater

Existing storage water heater:  – Rheem EH 86H-40 Water Heater

The Rheem EH 86H-40, from the 86H Classic Electric Storage Water Heater series, offers a 40-litre capacity and heats water using 3,000W at 230V AC, 50Hz.
It features a compact design of 664 mm length and heats water to 60°C in just 32 minutes.
This model ensures an efficient and reliable hot water supply, making it ideal for household use.

 

This heating element replacement and electrical work has met the following requirements for a storage water heater:

Storage Water Heater Safety, Electrical Work Scope:

1. Site Inspection and Planning

Begin by inspecting all wiring connected to the storage water heater, ensuring wires are 2.5mm in size, as required.
Then check the heater switch, magnetic contactor, and isolator to ensure the correct sizing and wire connection.
Check the heating element and thermostat for rust, and if none is found, conduct a light bulb test to determine if the fault lies in the connection or the heating element itself.

2. Replacing the Faulty Heating Element

If the heating element is identified as faulty, it should be promptly replaced with a new one.
This step is crucial to restore the water heater’s functionality and ensure efficient heating performance.

Storage Water Heater Safety - Heating Element Replacement

Storage Water Heater Safety - Heating Element Replacement

 

3. Replacing the Faulty Switch, Isolator, and Wires

Replace any faulty switches, isolators, and wires, especially if they show signs of wear, burn marks, or incorrect sizing.
This is vital for maintaining safety and preventing future electrical issues.

Storage Water Heater Safety - Burned Isolator Replacement

4. Testing the System and Cleanup

After replacements, thoroughly test the water heater system to ensure it operates correctly and safely.
Clean up the work area, leaving it tidy and free of debris, and provide the customer with a brief overview of the work completed.

 

Regulatory Compliance:

The electric water heater as a whole unit (i.e. parts incorporated in the water heater itself such as heating element, pressure relief valve/temperature relief valve, water tank, etc. shall be tested in accordance with the following:

  1. AS/NZS 4020:2018 Appendix K – Sample extraction procedure for use with water heating system. An accredited or non-accredited test report for Appendix K is acceptable provided that the test laboratory is accredited by Singapore Accreditation Council (SAC) to AS/NZS 4020:2018 Appendix H on Extraction of Metals, at the point of testing;
  2. The samples extracted in accordance with Appendix K shall then be tested in accordance with AS/NZS 4020:2018 Appendix H – Extraction of metals (for metallic materials in contact with water). The maximum allowable concentrations of metals listed in Table 2 of AS/NZS 4020:2018 shall not exceed the limits specified by the World Health Organization (WHO) Guidelines for Drinking Water Quality.

Condo Name: Kensington Square

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