Ariston Storage Water Heater Leaking: 10 Causes & Solutions
Ariston Storage Water Heater Leaking:
10 Causes & Solutions
10 Common Causes & Solutions (Singapore)
A leaking water heater is a serious concern that can result in water damage, increased utility bills, and even safety hazards. While Ariston water heaters are generally reliable and widely used in Singaporean households, leaks may still occur due to ageing, environmental factors, installation shortcomings, or poor maintenance. This guide outlines the key causes of leaks, includes the latest 2025 Ariston models, and offers practical solutions tailored for Singapore homes.
Ariston Storage Water Heater – 2025 Line-up
| Model | Heating Element | Heating Element Power and Warranty | Maximum Temperature (°C) | Tank Material | Pressure Rating | Drainpipe Connection | Price (SGD) |
|---|---|---|---|---|---|---|---|
| Ariston SLIM2 LUX-D WI-FI | Titanium | 2.5kW Lifetime | 80 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose |
|
| Ariston ANDRIS 2 LUX-D WI-FI | Copper | 1.5kW 1 year | 80 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose |
|
| Ariston ANDRIS LUX WI-FI | Copper | 1.5kW 1 year | 80 | Fe (Iron) + enamel | 8 bar | 8mm soft hose |
|
| Ariston ANDRIS 2 TOP 30 WIFI | Titanium | 1.5kW 1 year | 80 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose |
|
| Ariston ANDRIS SLIM2 LUX 30 WI-FI | Titanium | 2.5kW Lifetime | 80 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose | Discontinued |
| Ariston ANDRIS SLIM RS SL20 OR 30 | Copper | 2.5kW 1 year | 70 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose |
|
| Ariston ANDRIS2 15 OR 30 LUX | Titanium | 1.5kW Lifetime | 80 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose |
|
| Ariston ANDRIS 2 15 OR 30 RS | Copper | 1.5kW 1 year | 70 | Fe (Iron) + enamel | 7.5 bar | 8mm soft hose | Discontinued |
| ANDRIS LUX 15 OR 30 | Copper | 1.5kW 1 year | 70 | Fe (Iron) + enamel | 8 bar | 8mm soft hose |
|
| Ariston PRO RS J 25, 35 OR 50 | Stainless Steel | 2.5 to 3.3kW 1 year | 75 | Fe (Iron) + enamel | 8 bar | 15mm threaded fitting |
|
| Ariston PRO R 30, 40, 56 OR 80 SHE | Stainless Steel | 2.5 to 3.3kW 1 year | 65 | Fe (Iron) + enamel | 8 bar | 15mm threaded fitting |
|
| Ariston PRO 1 R INNOX SLIM 30 OR 40 H | Copper (with oversized Anode) | 2.5kW 1 year | 67 | Stainless steel | 8 bar | 8mm soft hose |
|
🔧 Main Causes of Ariston Water Heater Leaks
1. Corrosion and Rust (Most Common Cause)
Why It Happens:
Most Ariston tanks are constructed from iron with enamel lining. Over time, especially in Singapore’s humid and coastal environment, corrosion can develop internally—particularly when the anode rod has worn out. This leads to rust and eventually tank leakage.
What to Do:
- Replace the anode rod every 3–5 years.
- If rust is visible or the tank body is leaking, replace the heater.
2. Anode Rod Depletion
Why It Happens:
The anode rod sacrifices itself to prevent corrosion inside the tank. In many Ariston models, particularly rectangular units, the anode rod is smaller and may deplete faster—often within three years.
What to Do:
- Inspect the anode rod annually. Replace it if it is under 7mm thick or heavily corroded.
- Smaller rods may be designed to match the heater’s 5-year warranty lifespan.
3. Sediment Build-up
Why It Happens:
While Singapore’s water supply by PUB is among the best in the world, water stored in rooftop tanks may carry debris or sediment if tanks are not properly maintained. This leads to build-up, overheating, and tank damage.
What to Do:
- Flush the heater every 6–12 months. This typically requires a licensed plumber to remove the outlet for cleaning.
- Ensure the building complies with PUB’s mandatory annual inspection for water tanks.
- Contact PUB-appointed QC contractors (e.g., One Centum Pte Ltd, Mei De Engineering Pte Ltd) if maintenance is suspected to be substandard.
4. Tank Pressure Handling Capability
Why It Happens:
Models rated at 7.5 bar may not withstand the water pressure in high-rise flats or buildings with booster pumps is not always well managed by the HDB town council or the MCST. This can lead to stress on the tank and eventual leaks.
What to Do:
- Choose a unit rated at 8 bar or above for high-rise properties.
- Consider stainless steel tanks for better durability.
5. Faulty Pressure Relief Valve (PRV)
Why It Happens:
A PRV is designed to release excess pressure inside the tank. If it fails or sticks, internal pressure builds up, potentially causing the tank to rupture.
What to Do:
- Test the PRV annually.
- Replace immediately if it does not release water during testing.
6. Choked Drainpipe
Why It Happens:
Drainpipes may be redirected and terminated by air conditioning contractors to re purpose as condensation drains, or they may be obstructed during renovations. This can cause water to back up and leak.
What to Do:
- Hire only BCA-registered air-conditioning contractors who will submit the proper documentation.
- When in doubt, consult a licensed plumber.
7. High Water Inlet Pressure
Why It Happens:
Water pressure exceeding 10 bar (120 psi (pounds per square inch)) is common in some buildings. This is too high for tanks rated at 7.5 bar, leading to stress on internal components and premature failure.
What to Do:
- Install a pressure-reducing valve (PRV) if inlet pressure exceeds 50 psi (pounds per square inch).
- Excessive pressure drastically reduces heater lifespan.
8. Faulty Valves and Pipe Fittings
Why It Happens:
Leaks may develop from old or poorly installed fittings. Budget contractors or unlicensed handyperson sometimes reuse old parts, which are likely to fail within a few years.
What to Do:
- Insist on full replacement of all fittings during heater installation.
- Ensure PUB submission is completed.
- Select contractors who offer a 3–5 year extended warranty covering workmanship and fittings, matching the heater’s lifespan.
9. Thermostat and Gasket Issues
Why It Happens:
Worn gaskets or faulty thermostats can cause leaks near the element mounting area. A malfunctioning thermostat may overheat the water, damaging the tank.
What to Do:
- Replace the thermostat and gaskets if overheating or leaks are detected.
10. Ageing Water Heater (10+ Years)
Why It Happens:
Even well-maintained units deteriorate over time—seals crack, enamel weakens, and internal parts corrode.
What to Do:
- Replace any heater older than 10 years, regardless of whether it’s still functioning.
- Replace all related fittings, switches, and power connection units for safe operation.
🧰 When to Call a Professional?
Simple leaks caused by loose fittings might be repairable by competent householders. However, internal corrosion, high-pressure damage, or electrical faults require a licensed plumber or qualified electrician.
Note: Ariston authorised service centres may not be equipped to resolve complex plumbing-related issues.
✅ Prevention Tips for Singapore Households
- Annual Maintenance: Inspect the anode rod, flush the tank, and test the PRV.
- Water Pressure Check: Keep water pressure below 50 psi (pounds per square inch). Install PRVs if needed.
- Don’t Ignore Leaks: Early detection prevents more costly failures.
- Use Licensed Plumber: Always confirm PUB submission has been made and keep a record.
- PUB Submission: Ensure the installation complies with PUB regulations and is safe to use.
🔚 Final Note
Do not ignore water heater leaks—they are often symptoms of deeper issues that can lead to water damage, electrical risk, or property loss. Choosing the right heater, maintaining it properly, and ensuring compliance with Singapore’s safety standards will go a long way in prolonging the life of your Ariston heater.
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