Water Heater Singapore
Reason for the Callout
The customer reported leaking and rusty water from their existing water heater, along with visible stains on the ceiling caused by water damage. The heater had reached the end of its usable life.
Condo
Water Heater Rusty: Rheem EH-40M at Waterfall Gardens
A Waterfall Gardens homeowner experienced a Water Heater Rusty issue with their Rheem EH-40M. Homeone replaced it with a new unit of the same model, ensuring compliance with PUB standards.
Before: Rheem EH-40M
After: Rheem EH-40M
Date Of Replacement: 24 Apr 2025
Project Location: Farrer Road
Before Replacement:
The existing Rheem EH-40M heater was leaking at the base of the tank’s water pipe connection. Rust-coloured water stained the ceiling, indicating internal corrosion and active leakage, requiring urgent replacement to prevent further property damage.
After Replacement:
A new Rheem EH-40M heater was installed with secure fittings. The installation was professionally completed and certified, restoring a safe and reliable hot water supply with a proper PUB-compliant setup.
Inspection Findings 
- Rust stains were found on the heater tank and inlet connection, indicating internal corrosion.
- Brown water leaked from the tank base, confirming rust contamination in the system.
- Ceiling damage was visible beneath the heater due to ongoing water leaks.
- The cold water inlet lacked a PUB-approved check valve as required by SS636.
- Without a check valve, there was a risk of backflow contaminating the drinking water supply.
New Components Replacement
- Rheem EH-40M (new unit)
- New mounting bracket and anchor bolts
- Double check valve
- Stop valve
- Stainless steel piping for hot, cold and drain pipe (within 1m)
- Electrical bonding cable
Replacement work scope:
- Shut off the electrical and water supply
- Remove the faulty EH-40M unit safely
- Assess structural mounting and restore the ceiling area clearance
- Install a new EH-40M unit with updated fitting
- Reinstate water and electrical connections
- Test for proper operation, leaks, and insulation resistance
- Perform the water pressure test and water temperature test under PUB-licensed plumber supervision
- The PUB compliance submission
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:
The entire replacement process was carried out by Homeone’s trained technician under the supervision of a licensed PUB plumber. All safety measures, fittings, and connections complied with PUB regulations and Singapore Standard CP5:1998 for electrical safety. PUB submission was duly completed for documentation.