Gas Water Heater: Water Pipe Replacement
Gas Water Heater Water Pipe Replacement
Why we replace the water pipe section and all fittings in stainless steel on every gas water heater replacement.
What is this?
The water pipe section is the hot and cold water pipework that connects your gas water heater to the household water supply. On a standard replacement job, Homeone replaces the water pipe sections and all associated fittings — elbows, connectors, tees — up to 1 metre from the heater connection, including the new stop valve (S/N 7).
The replacement pipes and fittings are stainless steel. This is an upgrade from whatever material is currently installed.
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What types of water pipe are found on existing installations?
Homeone encounters five types of water pipe material on existing gas water heater installations. Each has specific failure modes, but the most common — PPR — has a critical weakness in outdoor installations.
PPR — Polypropylene Random Copolymer (more than 60% of installations)
PPR is the most common water pipe material on existing gas water heater installations. It is widely used because it is lightweight, inexpensive, and easy to install using heat fusion.
The problem: PPR becomes brittle when exposed to direct sunlight for extended periods. Singapore’s intense UV radiation breaks down the polymer structure of PPR pipe over years. The pipe gradually loses its flexibility and becomes rigid and fragile. Homeone has observed this extensively at condominiums including Lakeshore, Silversea, and many others — PPR pipes on aircon ledges that have cracked and started leaking without being touched.
When PPR pipe that has become brittle through sun exposure is then worked on during a heater replacement — fittings loosened, pipes moved, joints disturbed — the already-fragile material is far more likely to crack or leak. A pipe that was leaking before anyone touched it will almost certainly leak after being disturbed.
Copper pipe
Copper water pipes corrode over time, particularly at joints and connections. Internal corrosion produces verdigris (green deposits) and limescale buildup that restricts water flow. When disturbed during a heater replacement, loose scale and debris flow into the new heater.
Stainless steel pipe
Stainless steel is the most durable water pipe material and is what Homeone installs as the replacement standard. Existing stainless steel pipes in good condition are the least problematic, but the fittings and joints still degrade over 10–20 years and should be replaced when the pipe section is already disconnected.
Japanese Mechfit system
Mechfit is a proprietary press-fit pipe system using specialised fittings. It requires specific tools and fittings that are not interchangeable with standard plumbing. A surcharge of $150 applies when connecting to an existing Mechfit system.
German PEX pipe
PEX (cross-linked polyethylene) is a flexible pipe system used in some newer condominiums. Like Mechfit, it requires specialised fittings and tools. A surcharge of $150 applies when connecting to an existing PEX system.
Why we replace the pipes and all fittings
When the stop valve (S/N 7) is being replaced, the water pipes are already disconnected. The labour to replace the pipe sections and all their fittings is essentially the same as the labour to reconnect the existing pipes — because every joint must be remade regardless.
Every fitting in the water pipe section is a potential leak point. Whether PPR fittings on brittle sun-damaged pipe, copper fittings with corroded joints, or any other material — each old joint remade on old material is a gamble. Replacing every fitting with new stainless steel means every joint in the section is new, made once, and tested once.
How we know it works
The plumbing work — every new joint, every new fitting — is inspected by a PUB Licensed Plumber under SS636:2018. Water flow is tested before handover to confirm there is no restriction or leak. The work is covered by a 1-year warranty with next business day response.
Why the charge is $80
The $80 covers not just the pipe but all new stainless steel fittings within the section — elbows, connectors, tees — plus the labour to remove old pipes and fittings, assemble the new section, and the PUB Licensed Plumber inspection and 1-year warranty.
| What you're paying for | What it means |
|---|---|
| Material | New stainless steel pipe sections and all new fittings for both hot and cold water lines |
| Skilled labour | Remove old pipes and fittings, install new stainless steel sections, connect to existing pipework |
| Compliance | Inspected by PUB Licensed Plumber under SS636:2018 |
| 1-year warranty | Covered under the plumbing work warranty — next business day response |
Pipe material compatibility
Connecting to existing copper, stainless steel, or PPR pipes carries no surcharge.
A surcharge of $150 applies for Japanese Mechfit or German PEX systems, which require specialised fittings and tools.
The bottom line
More than 60% of existing water pipes are PPR — a material that becomes brittle under Singapore’s sun and cracks when disturbed. Copper corrodes and sheds debris into new heaters. Even stainless steel fittings degrade over 10–20 years. The water pipes are already disconnected when we replace the stop valve. Replacing them and all fittings at this point costs $80 and gives you a completely new stainless steel water pipe assembly.
We replace them on every job because the labour is already spent. The $80 buys new pipes, new fittings, and zero old joints.
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