Zooz ZSE42 Water Leak XS Sensor (800 series)
Small enough to sit under a dishwasher or behind a toilet, on a coin battery, reporting over Z-Wave to the hub that sends the alert and closes the valve.
By Zooz. Specs read from the maker on .
Price and stock: Zooz product page (where to buy)
| Radio | Z-Wave, 800 series chip, Z-Wave Long Range where the hub supports it |
|---|---|
| Range | Up to 400 feet line of sight, up to 1,300 feet with Z-Wave Long Range |
| Power | One CR2450 coin battery, included |
| Operating temperature | 32 to 104°F |
| Size | 2.4 x 1.4 x 0.4 inches |
| Rating | IP66, indoor or outdoor under an eave |
| Submersion | Takes a splash; not to be submerged, per the maker |
| Home Assistant | Listed by the maker as compatible through Z-Wave JS |
| Warranty | 5 years once registered, per the maker |
| Sound on the sensor | Not stated by the maker |
"Not stated by the maker" means the maker's pages do not say; this shelf leaves it blank rather than guess.
Know before you buy
It needs a Z-Wave hub; on its own it does nothing a person can hear. The maker's product page describes the older 700 series on a CR2032 battery; its spec page, cited here, gives the current 800 series a CR2450. Check which version the listing sells.
Where each spec was read
- Zooz support: ZSE42 Water Leak XS Sensor specs read 2026-10-27
- Zooz: ZSE42 Water Leak XS Sensor product page read 2026-10-27
Read first
- Where leak sensors goThe 8 places water starts inside a house, and where a sensor sits at each one so it reads wet early.
- Home Assistant recipes for leaks and freezesThree automations every water sensor setup needs: wet, cold, and quiet. Copy them as they are or let the builder write yours.
- Recipe: Leak sensor recipeWater on the floor at a water heater, a washer, a dishwasher, a sink or a toilet, the moment it gets there.
- Recipe: Sensor watchdog recipeThe failure nobody notices: a sensor whose battery died or that dropped off the network, so it can no longer warn you.
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Notes drafted with a language model from the maker's pages above and checked against them. Product information, not plumbing or electrical advice: a licensed plumber and your local code decide what is safe in your house.
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