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2 Feb 2024

Instant Water Heater Replaced With Rheem RCY 15 Water Heater at 3B Upper Boon Keng Road HDB on 1 Feb 2024

As a recurring customer, the decision for a water heater replacement stems from the recent incident at the customer's uncle's house, where their instant water heater, having reached the end of its lifespan, experienced a malfunction resulting in a burnout. Prioritizing safety, the customer is opting for a storage water heater. They recognize the safety advantages, as storage heaters can mitigate the risk of electrocution by utilising bonding to safely discharge electricity in the event of a faulty earth MCB. This informed choice aligns with the customer's commitment to a secure and reliable home environment.

  • Project location

    3B Upper Boon Keng Road (S)382003 HDB

  • Property type


Instant Water Heater


Replacement of Instant Water Heater to resolve heater problems end of service life.


Rheem RCY15 Water Heater is the new installation. All pipe works connecting to the heaters are stainless steel piping. Following the manufacturer's specifications, a new approved stop valve and double-check valves are employed. Such will comply with PUB Regulations. Our Licensed Plumber has supervised and approved the installation. There is a 1-year warranty by Homeone for this installation on top of the warranty provided by the manufacturer.

The final result

Instant Water Heater Replacement

Old water heater:

Instant Water Heater

New water heater:

Rheem RCY 15 Water Heater

The Rheem RCY 15 water heater is a model of Rheem’s commercial water heaters.
However, there’s no specific information available on an RCY 15 model.
Rheem manufactures various types of water heaters, including tankless water heaters, storage tank water heaters, and hybrid water heaters.
Here’s a general overview of the types, efficiency, and safety features you might find in Rheem water heaters:
Types: Tankless water heaters heat water on demand, offering continuous hot water and potentially saving energy compared to traditional tank-style water heaters.
Efficiency: Rheem water heaters are known for their energy efficiency.
They offer models with high Energy Factor (EF) ratings, which indicates how efficiently they convert energy into hot water.
Tankless and hybrid water heaters generally have higher efficiency ratings compared to traditional storage tank models.
Safety Features: Rheem incorporates various safety features into their water heaters to prevent accidents and ensure safe operation.
These may include:
Temperature and pressure relief valves to prevent overheating and excessive pressure build-up.
Flammable vapor ignition resistance to prevent accidents if flammable vapors are present in the area.
Overheat protection to shut off the heater if temperatures exceed safe limits.
Corrosion-resistant materials to prolong the lifespan of the water heater and prevent leaks.
Compliance with industry safety standards and regulations.


This heater unit has met the following requirements for a water heater:

Work Scope:

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

Regulatory Compliance:

The electric water heater, as a whole unit, shall be tested.
This includes parts such as the heating element, pressure relief valve, temperature relief valve, and water tank.
That work is done 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.


In conclusion, the Rheem RCY 15 Water Heater is a high-quality and reliable product that meets all necessary regulatory requirements.

The installation was carried out in compliance with PUB regulations, ensuring the safety and effectiveness of the new water heater.

We are pleased to inform that we have received the PUB Approval Letter for the installation.

This letter means that PUB has a record of this heater replacement job and it is authorized.



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