SI Water monitors your tank and manages your borehole pump automatically — daily top-ups, emergency fills, borehole protection and municipal backup. All onboard. No Home Assistant required. No cloud. No subscription.
Onboard automation
SI Water has a full automation engine built into the hardware. It manages your borehole pump, your municipal backup valve and your daily fill schedule — entirely on its own. No Home Assistant. No rules to write. No automation platform to configure.
Every day at your chosen time, SI Water tops the tank up to your target level. Set it once, forget it.
Define a fill-below and stop-at threshold. The device triggers the borehole whenever the tank drops below your comfort level.
When the tank drops to a critical level, the device bypasses the schedule and fills immediately — no matter the time.
A second source — municipal water via solenoid valve — activates automatically if the borehole can't fill the tank.
Restrict borehole operation to a configurable time window — useful for municipal pressure hours or noise restrictions.
The automation engine runs on the device itself. Your tank gets managed whether your phone is on, whether the internet is up, and whether Home Assistant is running. It just works.
Borehole protection
A borehole pump running dry is a very expensive problem. SI Water monitors inflow rate continuously while the pump is running. If flow drops below your minimum threshold, the pump stops immediately.
It then waits a configurable period and retries. If the fault persists across your maximum retry count, the pump is locked out and an alert fires. One tap resets the fault once you've investigated.
What SI Water monitors
A stainless-steel submersible pressure transducer sits in your tank. It measures the exact water column depth — converted live into litres and percentage. No floats. No guesswork.
Live inflow and outflow rates in L/min, tracked independently. Know exactly when your borehole is filling, when the household is drawing, and when something unexpected is running.
A slow drip or a burst pipe will show as unexpected outflow against a stable tank. SI Water spots the anomaly and raises an alert the same day — well before the next water bill.
Daily, monthly and lifetime fill and usage totals — inflow and outflow tracked separately. Understand your household consumption and spot inefficiencies over time.
The last three significant water events are logged by volume — so you can see exactly how much each fill cycle added to the tank, and spot any change in borehole yield.
Critical tank level, borehole fault, low flow warning and low tank level — each triggers a distinct alert so you always know exactly what needs attention.
All data is published via MQTT. If you run Home Assistant, every entity appears automatically — level, flow, totals, alerts. No custom integration. No cloud. Additive, not required.
Designed for South African water infrastructure: boreholes, JoJo tanks, rainwater harvesting, municipal backup. Built here, for the problems we actually have.
App Preview
Live tank level, automation status, flow rates and event history — all updated in real time from anywhere.
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Technical Specifications
| Sensor | Stainless-steel submersible pressure transducer (RS485) |
| Tank compatibility | Any volume, up to ~3 m depth (deeper on request) |
| Probe cable | 5 m standard (extendable) |
| Enclosure | IP65 weatherproof, wall-mount |
| Power | 220 V plug, ~2–3 W |
| Connectivity | Wi-Fi 2.4 GHz |
| Origin | Made in South Africa |
| Warranty | 12-month limited warranty |
| Automation | Onboard — no external platform required |
| Fill modes | Normal Fill, Daily Top-Up, Emergency Fill, Municipal Backup |
| Controls | Borehole pump + solenoid valve (municipal) |
| Borehole protection | Flow rate monitoring, retry logic, fault lockout |
| Schedule | Configurable pump operation time window |
| Telemetry | Level %, litres, inflow/outflow L/min, daily/monthly totals |
| HA integration | MQTT — optional, additive |
| Privacy | Local-first — no cloud, no subscription |
Ideal For
SI Water pays for itself the first time it catches a fault, prevents a dry run, or fills the tank at 2am so you wake up to a full tank.