The Molleaumètre is a self-powered shower flow meter that cuts water use by 23% per shower, and by up to 61% among the heaviest users (measured in the Hénéo pilot), through behaviour change alone, without reducing flow or comfort. Here is how it compares with the other shower water-saving devices on the market.
Comparison table
| Criterion | Molleau | Luniwave | Ilya (ILO sensor) | Hydrao | Amphiro | IKEA (Bergvattnet) |
|---|---|---|---|---|---|---|
| Type | Flow meter on the hose | Unit on the shower hose | Sensor on the hose | Shower head (replaces the existing one) | Module on the hose | Meter on the hose |
| Origin | France | France | France (Occitanie) | France (Grenoble) | Switzerland | Sweden |
| Self-powered (battery-free) | Oui | Oui | Oui | Oui | Oui | No (2 AA batteries) |
| Numeric consumption display | Oui | No (indicator lights only) | Oui | Non | Oui | Oui |
| Colour-coded light ring | Oui | Threshold indicator lights | Non | LEDs colour the water jet | Non | Non |
| Dual feedback (numbers + colour) | Oui | Non | Non | Non | Non | Non |
| Keeps the existing shower head | Oui | Oui | Oui | No (replaces the shower head) | Oui | Oui |
| No flow reduction (comfort preserved) | Oui | Oui | Oui | No (flow capped at 6.6 L/min) | Oui | Oui |
| Works at low flow | Yes, from 4.5 L/min | n.c. | No (8 L/min minimum) | n.c. | Oui | n.c. |
| Setup before showering | None, readable immediately | Select a target on screen | None | None | None | None |
| Connected version / B2B dashboard | Oui | Oui | Wi-Fi (online tracking partly in development) | App plus smart-home gateway | Bluetooth (consumer) | No (local display only) |
| Target market | Consumer plus residences, hotels and social housing | Hotels and tourism | Households plus accommodation | Consumer | Consumer | Consumer |
← Scroll the table horizontally →
Do you manage a portfolio of showers?
Thirty minutes to estimate your savings potential. No commitment.
What sets the Molleaumètre apart
A numeric display of the volume used and a colour-coded light ring, on the same device. The ILO sensor and the IKEA meter offer only a screen, Luniwave only indicator lights, Hydrao only the colour of the jet. This dual signal strengthens awareness.
The Molleaumètre works from 4.5 L/min, where some competing sensors require 8 L/min and therefore do not work on installations already fitted with low-flow shower heads.
No setup before the shower. Users see their consumption straight away, which keeps things simple, particularly in hotels where guests configure nothing.
Le Molleaumètre est autoalimenté par une micro-turbine hydroélectrique : l'eau qui passe génère l'électricité dont il a besoin. Le compteur IKEA Bergvattnet, lui, fonctionne sur 2 piles AA à remplacer, un point sensible pour un parc de douches à gérer.
Là où le compteur IKEA, Hydrao ou Amphiro s'adressent surtout aux particuliers, le Molleaumètre propose une version connectée avec dashboard centralisé : suivi de tout un parc de résidences, d'hôtels ou de logements sociaux, établissement par établissement.
In summary
The Molleaumètre positions itself as the most complete and the simplest awareness device to use: dual feedback, compatibility with all flow rates including efficient ones, no configuration, installation onto existing fittings, and a connected version suited to managers of residences, hotels and social housing.
For Hydrao this is a difference, not a flaw. Hydrao presents its capped flow as an advantage, since it guarantees a mechanical saving. Molleau's angle is to preserve comfort and adapt to the existing installation. Both promises hold: they simply answer different needs, and that is precisely what separates the two approaches.
Frequently asked questions
What is the difference between a shower meter and a connected shower head?
A shower meter screws onto the hose and measures the water passing through, without touching the shower head or the flow. A connected shower head, such as Hydrao, replaces the existing head and often combines a display with a mechanical reduction in flow.
The first informs without constraining and keeps your existing fittings; the second also acts on the flow but requires changing the head.
Do you have to replace the shower head to save water?
No, it is not necessary. The Molleaumètre fits onto the hose and keeps the existing shower head. It cuts water use by 23% per shower (up to 61% among the heaviest users, measured in the Hénéo pilot) through visual feedback alone, without changing the flow.
Replacing the head with a low-flow model remains a complementary lever, worth testing beforehand as perceptions vary.
Which water-saving device should a hotel or residence choose?
Across a portfolio of showers, favour a solution that installs with no building work, runs battery-free and offers central monitoring. The Molleaumètre screws on room by room in a few minutes, is self-powered by a micro-turbine, and offers a connected version with a dashboard for each property.
Unlike consumer shower heads (Hydrao, Amphiro) or the IKEA meter, it is designed for managers.
Does the Molleaumètre work on a shower that already has an efficient head?
Yes. It works from 4.5 L/min, where some competing sensors require a minimum of 8 L/min. It therefore remains compatible with showers already fitted with low-flow heads or aerators.
Does a shower meter need batteries?
Not necessarily. The Molleaumètre is self-powered by a hydroelectric micro-turbine: the water passing through produces the electricity it needs, with no battery and no charging.
Some devices, such as the IKEA Bergvattnet meter, do run on replaceable AA batteries, a maintenance point to plan for across a portfolio.
Can you monitor several showers remotely?
Yes, with the connected version. Each Molleaumètre sends its data over Bluetooth to a gateway installed in the building, which relays it to a dashboard (a Wi-Fi connection is required).
The manager tracks consumption shower by shower, property by property, and how it changes over time.