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14 Nov 2022

Joven JH25 Yishun HDB Exposed — Joven JH25 25L Water Heater Replaced with Rheem EHG30 30L Water Heater at Yishun St 61 HDB on 16 May 2020

Joven JH25 Yishun HDB Exposed

  • Project location

    Yishun St 61 HDB.

  • Property type


Joven JH25 Yishun HDB Exposed


Replacement of a storage heater from existing Joven JH35 storage heater to resolve heater problems (leakage, poor heating, etc.). Storage heater has stopped working and owner has decided to change the whole unit instead of the common practice of replacing the heating element.


Rheem EHG30 Model storage heater is used for replacement. All pipe works connecting to the heaters are replaced with stainless steel. A new approved stop and double check valves are employed in accordance with the manufacturer’s specification. Such will comply with PUB. Our Licensed has supervised and approved the installation. There is a 1-year warranty by Homeone for this installation on top of the warranty provided by Rheem.

The final result

Joven JH25 Yishun HDB Exposed

Old storage water heater: Joven JH25 25L Water Heater Exposed

New storage water heater: Rheem EHG30 30L Water Heater Exposed

Work Scope

1. Supply of tank, pipe and fittings
2. Removal of old tank
3. Pipe works partial redo to comply PUB
4. New tank installation
5. Testing and commission. Submission to PUB
6. Clean up before leaving
7. PUB approval letter

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.


Reason for the Replacement: End of service life

Our  licensed water service plumber has ensured that work is done in accordance with the conditions stated below:

  1. All water service installations must be in accordance with the Public Utilities (Water Supply) Regulations, Singapore Standards 636 for Water Services and all other relevant statutory requirements.
  2. The proposed works shall not adversely affect the existing water supply reticulation system.
  3. Proposed water storage heater is installed in accordance with the specifications and requirements of the manufacturer. The installation of double check valves is safe and effective to prevent backflow and the back siphonage of water from the storage water heater through the heater inlet pipe and will be safe for use.

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