What Is WELS?
A Practical Guide to Water Efficiency Labels for Boiling Water Taps
Understanding WELS Standards in Singapore-and Why They Matter to Global Brands
[2025-12-19] | By Xiamen Smart Water Technology Co., Ltd. Allen Huang
If you are sourcing or selling boiling water taps and kitchen faucets in Southeast Asia or Australia-related markets, you will almost certainly encounter WELS. But what exactly is WELS, and why does it matter so much for manufacturers, distributors, and brand owners?
This guide explains the Water Efficiency Labelling Scheme (WELS) in plain language, with a focus on kitchen taps and boiling water tap systems, and how compliance impacts product approval, market access, and brand credibility.
Table of Contents
- What Is WELS?
- Who Manages WELS in Singapore?
- Mandatory vs Voluntary WELS Explained
- Products Covered Under Mandatory WELS (MWELS)
- WELS Rating System: How Water Efficiency Is Graded
- How to Read a WELS Water Efficiency Label
- WELS Flow Rate Requirements for Taps
- Why WELS Matters for Boiling Water Tap Brands
- FAQs About WELS Certification
- Call to Action: Work With a WELS-Ready ODM Manufacturer
WELS stands for Water Efficiency Labelling Scheme. It is a national water-saving program introduced in Singapore in 2009 to help consumers and businesses identify how water-efficient a product is before purchase.
The system uses a rating label to clearly show:
- Water consumption performance
- Efficiency level
- Verified registration details
In short, the more ticks on the label, the more water-efficient the product.
WELS is administered by PUB, Singapore's National Water Agency. PUB oversees:
- Product testing standards
- Registration and approval
- Ongoing compliance monitoring
Any water-using product sold in Singapore that falls under mandatory WELS must be registered with PUB before entering the market.
WELS is divided into two categories:
Mandatory WELS (MWELS)
Introduced in 2009, MWELS requires certain products to display a water efficiency label by law before they can be sold in Singapore.
Voluntary WELS (VWELS)
This is optional and applies to products not yet regulated under MWELS. Manufacturers may still register to demonstrate water-saving performance.
The following products must comply with MWELS in Singapore:
| Product Category | Included |
|---|---|
| Shower taps & mixers | Excluding concealed types |
| Basin taps & mixers | Yes |
| Sink / kitchen taps & mixers | Yes |
| Dual-flush low-capacity cisterns | Yes |
| Urinal flush valves | Yes |
| Waterless urinals | Yes |
| Household washing machines | Yes |
Note:
- Standalone shower heads are currently not mandatory under WELS.
- For boiling water tap systems, the tap outlet and flow performance are the key WELS-relevant components.
WELS uses a tick-based grading system:
| WELS Rating | Efficiency Level | Consumer Meaning |
|---|---|---|
| 0 Tick | Basic | Meets minimum requirement |
| 1 Tick | Good | Water-saving |
| 2 Ticks | Very Good | High efficiency |
| 3 Ticks | Excellent | Best-in-class water efficiency |
More ticks = lower water consumption at rated pressure.
A compliant WELS label must be clear, visible, and easy to verify.
Each label includes:
- Brand name
- Model number
- Water efficiency rating (ticks + wording)
- Water consumption or flow rate
- PUB registration or serial number
Label Number Explanation
- MWELS products show a Registration Number
- VWELS products show a Serial Number
These numbers can be checked directly in PUB's database.
Below is a simplified reference for tap flow rate requirements under WELS (actual limits depend on tap type and use case):
| WELS Rating | Typical Flow Rate (L/min)* |
|---|---|
| 0 Tick | Higher flow, basic efficiency |
| 1 Tick | Reduced flow |
| 2 Ticks | Low flow |
| 3 Ticks | Ultra-low flow |
*Exact limits are defined in PUB's official WELS technical documents.
For boiling water taps, manufacturers often design dual-channel systems-filtered boiling water and normal cold water-so efficiency compliance does not compromise user experience.
For brands selling into Singapore or WELS-aligned markets, compliance is not optional-it is a market entry requirement.
Key Benefits of WELS-Compliant Boiling Water Taps
- Faster product approval
- Higher acceptance by distributors and developers
- Stronger sustainability messaging
- Improved brand trust and authority
- Alignment with green building standards
At Xiamen Smart Water Technology, our boiling water tap designs are developed with WELS flow control, UL safety standards, and ODM flexibility in mind-helping brands reduce time to market.
Is WELS mandatory in Singapore?
Yes, for products listed under MWELS, including kitchen taps.
Does WELS apply to boiling water taps?
Yes. The tap component and flow rate must comply with WELS requirements.
Do more ticks affect performance?
No. Well-designed boiling water tap systems maintain strong flow while meeting efficiency limits.
Can ODM manufacturers help with WELS registration?
Yes. Experienced manufacturers can support testing, documentation, and compliance design.
Looking for a boiling water tap manufacturer that understands WELS compliance, UL certification, and international ODM requirements?
Xiamen Smart Water Technology Co., Ltd. works behind many leading global under-sink drinking water brands.
Visit www.kitchenwatertap.com to discuss:
- ODM & private label manufacturing
- WELS-ready boiling water tap designs
- Distribution and wholesale partnerships