26 Jun 2025

18A Holland Drive HDB

Alpha Water Heater Rusty Replacement: Alpha ALP 25L-H to PRO RS J 25 at 18A Holland Drive HDB on 20 Jun 2025

A homeowner at 18A Holland Drive HDB reached out to Homeone after noticing water stains and discolouration on the ceiling below their concealed heater. Our on-site inspection confirmed the issue—an "Alpha Water Heater Rusty" case, where the tank showed visible corrosion along its base and joints.

In addition to the rust and early signs of leakage, the heater installation lacked several key safety components:

No double check valve for backflow prevention, in violation of SS636
No drainpipe from the temperature & pressure relief valve, risking uncontrolled discharge
No electrical bonding, creating a potential electrocution hazard (breach of CP5:1998 Clause 413-02)

Project location
18A Holland Drive HDB
Property type
HDB

Before

Replacement of a Alpha ALP 25L-H water heater to resolve heater problems end of service life.

After

The Ariston PRO RS J 25 has been newly installed to the existing water heater system, with all connecting pipework made of stainless steel. The installation includes a new stop valve, double check valve, drain pipe, electric bonding, and 2.5mm² wire, and a submission has been filed to PUB to ensure safety and compliance with PUB regulations. Additionally, Homeone offers a 1-year warranty on this installation, complementing the manufacturer's warranty, ensuring peace of mind and reliable service.

Table of Contents

Alpha Water Heater Rusty Replacement: Alpha ALP 25L-H to PRO RS J 25 at 18A Holland Drive HDB

Old Water Heater:

Alpha ALP 25L-H

Old Water Heater:

Ariston PRO RS J 25

Site Findings

Advanced Alpha water heater rusty condition at the tank base
Risk of backflow contamination due to a missing check valve
No proper drainpipe installed to route overflow water
No earth bonding on metal fittings and pipes
The heater was at the end of its service life and required immediate replacement

Proposed Solution for Alpha Water Heater Rusty

To replace the Alpha water heater rusty unit, Homeone installed a new Ariston PRO RS J 25—a 25-litre storage heater known for its improved corrosion resistance and compact build, suitable for HDB ceilings.

Compliance upgrades included:

PUB-approved double-check valve installation
Stainless steel drainpipe to direct relief water safely into a floor trap
Electrical bonding for all metallic components
Replacement of old plastic fittings with stainless steel pipes (within 1 metre)

All works were carried out under the supervision of a PUB-licensed plumber and submitted for PUB compliance documentation.

Work Scope for Ariston Water Heater Rusty Replacement

Removal & Site Prep

Shut off the water and power supply
Safely removed the corroded Alpha ALP 25L-H unit
Disconnected non-compliant fittings

Installation of Ariston PRO RS J 25

Mounted the new Ariston PRO RS J 25 securely
Installed stainless steel inlet/outlet pipework
Fitted double check valve, drainpipe, and stop valve
Applied protective electrical bonding
Recommissioned the system and tested for leaks and safety

Testing & Commissioning

Leak testing and pressure validation
Bonding continuity check
Verified safe operation of temperature relief valve and new drainage line

Documentation

Submit the required documents to PUB by a PUB-licensed plumber

Conclusion

This Alpha Water Heater Rusty case at 18A Holland Drive was resolved with a safe and fully compliant upgrade to the Ariston PRO RS J 25 model. The new installation includes all PUB-required components, ensuring clean water, backflow protection, safe pressure relief, and protection against electrical hazards.

At Homeone, we don’t just replace water heaters, we restore safety and compliance with every job.

Project Location: 18A Holland Drive HDB

18A Holland Drive HDB