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The WELS star rating on a bathroom mixer tap tells you how water-efficient it is, on a scale of zero to six stars, with more stars meaning less water flows through the tap at full pressure. A higher star rating generally means lower water use and lower water bills, though it can also mean a noticeably gentler flow, which is where personal preference and practicality come into the decision.
This guide explains what the WELS rating actually measures, and how to choose a mixer tap that balances water efficiency with everyday comfort.
What Does a WELS Star Rating Actually Mean?
WELS stands for the Water Efficiency Labelling and Standards scheme, the mandatory Australian rating system for tapware, showers and other water-using fixtures. Every mixer tap sold in Australia must display a WELS rating, based on how much water flows through it under standard test conditions. The rating exists so buyers can compare water use across brands and models using one consistent scale, rather than relying on manufacturer claims.
How Flow Rate and Aerators Affect Everyday Use
The aerator, the small fitting inside the tap outlet, is largely responsible for how a mixer tap achieves its water efficiency rating. Aerators mix air into the water stream, maintaining a full, comfortable-feeling flow while physically reducing the volume of water used. This is why a well-designed high star-rating tap can still feel generous to use, rather than feeling like a trickle, even though less water is actually flowing through it.
Balancing Water Efficiency With Water Pressure
Homes with naturally lower water pressure can sometimes notice a higher star-rating tap feels underwhelming, since there is less pressure behind the water to begin with. If your home has lower pressure, it is worth checking the tap's flow rate at your specific pressure range rather than relying on the star rating alone, and discussing options with your supplier if comfortable flow matters more to you than the highest possible rating.
For most standard-pressure Brisbane homes, a mid-to-high star-rating mixer tap, generally four to five stars, offers a solid balance of water savings and everyday comfort, without the compromise sometimes associated with the very highest ratings.
For specific model recommendations, see our roundup of top water-saving bathroom mixer taps.
Why Choose Builders Discount Warehouse
Builders Discount Warehouse stocks a wide range of WELS-rated bathroom mixer taps, with clear star ratings and flow rate information listed on every product (for example, our 5-star basin mixers list a 5L/min flow rate against roughly 8L/min for a 3-star model). Our team can help you choose a tap that balances water efficiency with the flow and pressure your home actually needs. Browse the full mixer tap range online or visit one of our showrooms, Brendale, Slacks Creek or Arundel, to compare finishes and flow in person.
Frequently Asked Questions
What is a good WELS star rating for a bathroom mixer tap?
A four to five-star rating is a solid middle ground for most homes, offering meaningful water savings without a noticeable drop in everyday comfort. Six-star taps offer the highest water savings but can feel gentler, particularly in homes with lower water pressure.
Do WELS-rated taps cost more than standard taps?
Not necessarily. WELS ratings apply to all tapware sold in Australia, so a higher star rating is not automatically a premium feature. Price is generally driven more by brand, finish and build quality than by the star rating itself.
Will a high star-rating tap reduce my water pressure?
A higher star rating reduces the volume of water used, not your home's underlying water pressure. However, in homes that already have lower pressure, a high star-rating tap can feel gentler, since there is less water and pressure combined at the outlet.
Can I replace the aerator in my mixer tap to improve efficiency?
In many cases yes, aerators can be replaced with a higher-efficiency version, though this can affect the tap's official WELS rating and flow characteristics. Check with your supplier before swapping an aerator on an existing tap.