Water Efficiency
WELS Ratings Explained: How to Choose Water-Efficient Tapware in Australia
The Aquaro Team · 12 June 2026 · 4 min read · Updated 1 September 2026
The WELS sticker on a tap or shower head — a blue-and-white label with a star rating out of six — tells you exactly one thing: how much water it uses per minute compared with everything else in its category. More stars means less water for the same job. It's mandatory, it's standardised, and once you know how to read it, it's the fastest way to compare tapware without guessing.
What WELS actually is
WELS stands for Water Efficiency Labelling and Standards — a national scheme run by the Australian Government that's been mandatory since 2005. Any tap, shower head, toilet, washing machine or dishwasher sold in Australia has to be registered and labelled with its water efficiency, the same way whitegoods carry an energy star label. The goal is simple: let a shopper compare two products on water use at a glance, without reading a spec sheet.
How the star rating works
Each product type is rated on its own scale of 0 to 6 stars, based on its flow rate in litres per minute (L/min) at a standard test pressure. More stars always means less water for the same category of fixture — but the scale isn't shared across categories. A 4-star shower head and a 4-star basin tap aren't tested the same way, so only compare star ratings within the same product type.
As a rough guide to what the stars mean in practice for tapware:
- An older, unrated fixture typically runs around 20L/min — most of that never gets used, it just goes down the drain.
- A 3 Star fixture is usually in the order of 9L/min.
- A 4 Star fixture is usually in the order of 7.5L/min.
- 5 and 6 Star fixtures step down further again — most of Aquaro's tapware sits in this range.
These are indicative figures, not the official determination table — always check the specific rating and litres-per-minute figure printed on the product itself.
What star rating should you actually buy?
For everyday household tapware, 4 stars and above is a sensible baseline — it's a meaningful step down from an old fixture without any real compromise in feel. If you're chasing every efficiency point (or your renovation needs to hit a specific rating for approval — more on that below), look for 5 or 6 Star. Every Aquaro product page that carries a WELS rating also shows its exact flow rate and includes a water-and-cost calculator, so you can see roughly what switching would save based on how the fixture actually gets used in your home, rather than a generic average.
Where it matters most: renovations and new builds
Water efficiency isn't just a nice-to-have if you're building or substantially renovating. Several state planning and building schemes — BASIX in NSW is the best known — set minimum WELS star ratings for new tapware and shower heads as a condition of approval. Requirements vary by state, by dwelling type, and do change over time, so treat this article as a starting point rather than the final word: confirm the current minimum with your certifier, building surveyor or plumber before you finalise a fitout, especially if you're working to a compliance deadline. If you're also deciding between a basin mixer or a wall mixer for the same renovation, both styles carry the same WELS rating system, so it comes down to layout and finish, not water efficiency.
Reading the label
A genuine WELS label shows the registered star rating, the average flow rate in L/min, and a registration number that ties back to the product's official listing — it isn't just marketing shorthand. If a product claims a star rating with no flow rate figure anywhere near it, that's worth double-checking before you buy.
It's not just a water bill — it's a hot water bill too
A lower flow rate at the hot tap doesn't only save water; it also cuts how much water your hot water system has to heat in the first place. For fixtures used mostly on hot — showers especially — that's a second, often overlooked saving stacked on top of the water cost itself, whether your hot water is gas, electric or heat-pump. It's part of why shower heads tend to carry some of the highest-impact star rating upgrades in the whole scheme.
Shop WELS-rated tapware
Every basin mixer, wall mixer and shower fitting in the Bathroom Tapware range lists its WELS rating and flow rate on the product page, alongside a downloadable spec sheet, including 5 Star models like the Aquaro Round Basin Mixer 200mm, so you can compare on water efficiency the same way you'd compare on finish or price. If you're replacing an existing fixture, our measuring guide covers what to check before you order.
Frequently asked questions
- Is WELS the same as an energy star rating?
- No. WELS (Water Efficiency Labelling and Standards) only measures water use, not energy use. A product can be highly water-efficient without any bearing on electricity — the two schemes are unrelated, and only WELS applies to tapware.
- Do all Aquaro products have a WELS rating?
- WELS applies specifically to taps, shower heads, toilets, urinals, washing machines and dishwashers — fittings like towel rails, robe hooks and laundry troughs sit outside the scheme entirely, so you won't see a rating on those. Every tap and shower head we sell that's covered by the scheme carries its registered star rating and flow rate on the product page.
- Will a higher WELS star rating noticeably reduce my water pressure?
- Not usually. Star ratings measure flow rate at a standard test pressure, and most 4–6 star fixtures use aerators or flow restrictors that maintain a full, even feel while using less water — the difference is far more noticeable on your water bill than in the shower.
- Is WELS labelling required by law in Australia?
- Yes. WELS is a mandatory Commonwealth scheme — it's illegal to sell an unregistered, unlabelled product in a category the scheme covers. Builders and certifiers may also require a minimum star rating under state building regulations, so it's worth checking current local requirements before a new build or major renovation.
