Smart Water Leak Detectors

A $30 sensor that beeps before a slow leak becomes a $10,000+ insurance claim is one of the better value-for-money smart home purchases going. Here's what's actually available and what it costs.

The basic alert sensors — Aqara and Govee

Aqara's Water Leak Sensor (and newer T1 version, sold in NZ through Noel Leeming, Smith's City and The Technology Store) is a small waterproof puck rated IP67 that you place on the floor near a hot water cylinder, dishwasher, washing machine or under a sink. It detects water contact and sends a push notification via the Aqara hub — it does not shut anything off itself. Aqara's global pricing sits around US$19 for a single sensor, translating to roughly NZ$30–45 through local retailers depending on whether it's bundled with a hub.

Govee's water leak detectors work similarly and are commonly sold as multi-packs — a 5-pack with hub around US$70 globally — giving decent per-unit value if you want sensors under several appliances and both bathrooms.

Both of these are alert-only: useful if you're usually home or can act quickly on a phone notification, useless if you're away for weeks and nobody can turn the water off.

The whole-home system — Flo by Moen

Flo by Moen sits at the other end of the category: an inline device fitted to your home's main water supply by a plumber that monitors flow continuously and can automatically shut the water off if it detects a leak pattern, not just a puddle. It's priced from roughly US$400+ before NZ import and plumber install costs, so it's a different budget tier entirely — this is a "before you go away for a month" or "insurer discount" purchase, not a per-appliance sensor.

Flo's own FloProtect plan bundles an extended warranty with up to US$5,000 in insurance deductible coverage in supported markets, and the company notes some insurers offer policy discounts for having a monitored shutoff system installed — though this is US-market focused and NZ insurers' equivalent programmes should be confirmed directly with your provider rather than assumed.

Does this actually help with NZ home insurance?

Escape of water (burst pipes, failed hoses, slow leaks under floors) is consistently one of the more expensive categories of home insurance claims, since damage often isn't noticed until it's spread into flooring, walls or ceilings. Some NZ insurers offer excess reductions or minor premium discounts for monitored alarm and leak detection systems, but this varies by insurer and isn't universal — it's worth a direct call to your provider before assuming a discount, rather than buying sensors purely for a premium reduction that may not exist on your specific policy.

Where to actually put sensors

• Under the kitchen sink, behind the dishwasher, and under the washing machine — the highest-risk spots for slow leaks.
• Next to (not under) a hot water cylinder, since cylinder failures are a common and expensive leak source in older NZ homes.
• Bathroom floor near the shower base or bath, particularly in older homes with aging waterproofing membranes.