Water Heater Singapore
Reason for the Callout
Hot water had turned yellowish brown, and the existing heater lacked mandatory safety components like double check valve, drainpipe, and bonding.
HDB
Hot Water Yellow: Ariston AN2 15 RS Replacement at 101A Bidadari Park Drive
A resident at 101A Bidadari Park Drive HDB reported a “Hot Water Yellow” issue. Our team replaced the corroded Ariston heater with a new AN2 15 RS unit, fully compliant with PUB regulations.
Before: Ariston AN2 15 RS
After: Ariston AN2 15 RS
Date Of Replacement: 24 May 2025
Project Location: Bidadari Park Drive
Before Replacement:
The old water heater showed signs of severe internal rust, and the hot water output was discoloured. There was no double check valve, drain pipe, or earth bonding, posing a hygiene and electrical hazard.
After Replacement:
We replaced the faulty heater with a new Ariston AN2 15 RS unit. New safety fittings were installed to ensure clean water delivery and safe electrical performance.
Inspection Findings 
- Corrosion on internal tank walls
- Rusty, discoloured hot water at the outlet
- No double-check valve, which can lead the water backflow.
- No electrical bonding
- Drain water is discharging improperly due to a lack of a PRV drainpipe
New Components Replacement
- Double Check Valve – Prevents backflow contamination
- Drain Pipe – Safely channels overflow water
- 2.5mm² Cable – Provides essential electrical bonding and supplies a new power supply cable for the heater.
- Earth Bonding – Ensures electrical safety
- Gate Valve – Allows shut-off for maintenance
Replacement work scope:
- Removal of the old, rusted heater
- Supply and installation of Ariston AN2 15 RS
- Double Check Valve: Prevents backflow contamination
- Drain Pipe: Ensures safe discharge from PRV
- 2.5mm Cable & Earth Bonding: Protects users from electric shock risks
- Gate Valve: Enables convenient water shutoff during servicing
Our PUB Licensed Plumber has endorsed that the work is done in accordance with the conditions stated below:
- 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.
- The proposed works shall not adversely affect the existing water supply reticulation system.
- The 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 in preventing backflow and the back-siphonage of water from the storage water heater through the heater inlet pipe, and will be safe for use.
Conclusion:
This replacement was completed by a Homeone-trained technician and supervised by a PUB-licensed plumber. All installations were carried out in full compliance with PUB regulations for safety, hygiene, and water system integrity.