Water where it should not be
External leak rope detects water around heaters, pumps and appliances.
Designed and assembled in Toronto
HavnCraft
Small smart devices for real homes.
Buy them ready to use, build them yourself, or make them truly yours with an AI-designed shell.
Current launch product: HavnCraft Sentry, a smart water, humidity, freeze-risk and leak-rope monitor for basements, garages, laundry rooms and utility spaces.
Local + phone alert
Leak detected
Near the water heater - 8:42 PM
Why monitor
Small environmental problems are easiest to catch early.
Humidity that can damage stored items
Track sustained high humidity and receive early warnings.
Temperatures approaching freeze risk
Get notified before vulnerable spaces become dangerously cold.
How it works
Place the monitor where it can see the room, then route the leak rope to the risk.
Place the monitor
Set the main unit where USB power and reliable 2.4 GHz Wi-Fi are available in the room you want to watch.
Route the leak rope
Place the external sensing rope near the highest-risk water source, such as a heater, washer, sump pit or floor low point.
Connect the app
Use BLE setup, connect Wi-Fi, bind the device to your account and choose alert thresholds.
The main unit measures temperature and humidity where the unit is placed. Large basements, divided rooms or remote water sources may need more than one device.
Power and connection boundaries
Clear behaviour beats vague battery claims.
Daily power
USB-C is recommended for continuous monitoring.
AA batteries
Battery runtime testing is in progress. USB-C is recommended for continuous monitoring.
Power outage
Local behaviour depends on final hardware and firmware validation; cloud alerts require available network power.
Wi-Fi outage
Local buzzer and LED behaviour are designed to continue; cloud notifications resume after connectivity returns.
Wi-Fi
2.4 GHz Wi-Fi is used for cloud telemetry. Keep the unit where the router signal is reliable.
BLE
Bluetooth is used for setup and Wi-Fi provisioning, not as the primary remote monitoring path.
Subscription
Core alerts, device health and essential history are intended to stay available without a mandatory subscription.
Standard shells included
Explore custom shellsSmart hardware that belongs in your home.
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Five standard shells are included. A custom shell can be added at checkout; paid orders unlock the AI design intake, customer review and print approval flow.
Companion app
Setup, monitor and review alerts from your phone.
HavnCraft Sentry
Leak clear
Temp 69 F / RH 42% / Wi-Fi -58 dBm
Low battery and offline reminders appear here.
HavnCraft Home helps users set up devices, monitor current state and review alerts from one account.
- BLE setup and Wi-Fi provisioning
- Current temperature, humidity and leak state
- Alert review, device health and battery status
- Account-bound device visibility
Trust and limits
Useful early warning, with honest boundaries.
Secure checkout
Payments use Stripe Checkout. Taxes are calculated from the shipping address during checkout.
Support target
Email support handles setup, order and device questions while the support knowledge base grows.
Certification status
ISED/FCC final product status is pending. No certification mark or approval number is claimed on this site.
HavnCraft Sentry is an early-warning environmental monitor. It is not a life-safety device, smoke alarm, carbon-monoxide alarm, flood-prevention system or certified mould detector. Alerts depend on device placement, power, network availability and notification settings.
Questions before buying
Full FAQClear answers for placement, power and subscriptions.
Where should I place HavnCraft Sentry?
Place the main unit where USB power and reliable Wi-Fi are available. Route the external leak rope to the highest-risk water source.
Does it work without Wi-Fi?
Local alarm behaviour is designed to continue for key events, but phone notifications and remote monitoring require cloud connectivity.
Does it require a subscription?
Core alerts, device health and essential history are intended to remain available without a mandatory subscription.
What happens during a power outage?
USB-C is recommended for continuous monitoring. AA battery runtime and backup behaviour depend on final hardware and firmware validation.
How long do the AA batteries last?
Battery runtime testing is in progress. We will publish verified numbers only after final firmware and hardware testing.
Can one device cover my whole basement?
One device monitors the main unit location and the routed leak rope. Large or divided spaces may need multiple devices.