25 Jun 2025

Woodsvale

Joven Water Heater Corrosion Replacement: Joven JH50 to JSH50 at Woodsvale on 25 Jun 2025

During our assessment of the existing Joven water heater (shown in the second photo), we found that the installation did not comply with the manufacturer’s installation guide, nor did it meet PUB regulatory standards. Several essential safety components were missing or improperly installed, which may have contributed to the unit’s early corrosion and reduced service life.

According to the official Joven installation manual, the following elements must be installed for safety, performance, and compliance:

Double check valve – essential for blocking backflow and required by SS636.
Drainpipe – to channel relief-valve discharge safely to the nearest floor trap.
Protective electrical bonding – mandatory under CP5 Clause 413-02 to prevent electrocution.

Project location
Woodsvale
Property type
Condominium

Before

Replacement of a Joven JH50 water heater to resolve heater problems end of service life.

After

The Joven JSH50 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

Joven Water Heater Corrosion Replacement: Joven JH50 to JSH50 at Woodsvale

Old Water Heater:

Joven JH50

Old Water Heater:

Joven JSH50

Site Findings

Joven Water Heater Corrosion along the tank seam and the mounting bracket.
No backflow protection; inlet fittings starting to leak.
Relief valve doesn’t have a drainpipe to discharge the drain water.
No earth-bonding wire.

Proposed Solution to Replacement for Joven Water Heater Rusty

Homeone removed the corroded JH50 and installed a new Joven JSH50 (50 L) with full PUB compliance:

Backflow prevention – Installed PUB-approved double check valve
Safe discharge – Routed stainless-steel drainpipe to floor trap
Electrical safety – Added 2.5 mm² supply cable and bonding strap
New pipework – Re-piped hot & cold lines (≤ 1 m) in stainless steel

All works were carried out by our team under the close supervision of a PUB-Licensed Plumber. On completion, we lodged the required installation submission with PUB to formalise compliance.

Work Scope for Water Heater Corrosion Replacement

Removal & Site Prep

Shut off the water and power supply
Safely removed the corroded Joven JH50 unit
Disconnected non-compliant fittings

Installation of Joven JSH50

Mounted new 50L JSH50 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 water heater corrosion case at Woodsvale posed multiple hazards, from tank failure and water backflow to potential electrocution due to missing bonding. Homeone’s replacement with a Joven JSH50 and full safety upgrades ensures the homeowner now enjoys a PUB-compliant, leak-free, and safe water heater installation.

All work was carried out under the supervision of a PUB-licensed plumber.

Project Location: Woodsvale

Woodsvale