I Bought & Tested the Best-Selling Water Level Monitors. Here's Why TankSentry is #1:
Written by Benjamin Carter
After that weekend, I swore I'd never trust a mechanical float again. My first fix was a cheap clip-on alarm that howled anytime condensation splashed the sensor, false alerts at 3 a.m. included.
Next I tried a budget WiFi sensor a friend swore by, but my cistern sat sixty feet from the router through two concrete walls, and the app went dark for days at a time. A pressure-tube model came next; it worked fine until sediment clogged the tube and readings drifted off by inches.
By the third failed attempt, I stopped guessing and started testing systematically. Over six weeks I installed five leading water level monitors across my own cistern and two client properties, logging accuracy, signal drop-outs, and app alerts side by side.
Here's what I found.
My Test Results
I mounted all five monitors, TankSentry included, across three different tanks: my own 1,500-gallon cistern, a rooftop tank at a rental property I manage, and a client's underground well. Over six weeks, I logged twice-daily manual readings against each app's reported level, tracked WiFi drop-outs during a stretch of thunderstorms, and timed install speed from box to first reading.
I scored every device against four criteria: measurement accuracy, connectivity reliability, installation ease, and app experience, then layered in satisfaction data from verified buyer reviews. I intentionally tested through bad weather, spotty rural internet, and a sediment-heavy well to see which sensors held up outside a lab environment.
TankSentry's ultrasonic sensor impressed me first. During week two, it flagged a 4-inch overnight drop in my cistern that turned out to be a slow leak in a supply line — an issue my old float gauge would have missed for weeks.
Beyond raw accuracy, the app's rolling 90-day usage graph let me spot a seasonal irrigation spike I hadn't noticed before, and the dual WiFi/Bluetooth fallback kept readings flowing even when my router rebooted mid-storm. Installation took under eight minutes with zero cutting into the tank.
The only real limitation surfaced when I tried ordering a second unit for a client two weeks later and found it backordered — a demand problem, not a performance one. Every other monitor in this test had a functional weakness this one simply didn't.
The Results:
Across every criterion we measured, TankSentry simply held up better under real conditions than anything else we tested.
Value
Once I stopped manually checking gauges and hauling emergency water jugs, I got back hours of my month I didn't know I was losing. There's real value in never again driving to a hardware store for a backup float switch or standing on a ladder squinting at a rusty dial.
The cost of doing nothing is sneaky. It's the emergency plumber call, the ruined weekend, the slow leak that quietly floods a crawlspace for months before anyone notices. Cheap alternatives that fail within a season end up costing more than a reliable monitor ever would.
Build quality held up through six weeks of storms, heat, and one accidental garden hose spray with no issues. Backed by a standard manufacturer warranty and a housing rated for genuinely harsh outdoor conditions, this is the kind of purchase that pays for itself quickly in avoided damage alone.
Peace of Mind, Whether You're Home or Not
These days I check my phone instead of climbing a ladder. Whether I'm traveling for work or just asleep, I get a push alert the moment a level dips below what I've set, and that's replaced a low-grade anxiety I didn't realize I was carrying around every week.
It's not just for cabin owners either. Landlords managing rental properties, families on well water, and anyone running a hobby farm all benefit from the same real-time visibility, especially when multiple tanks live under one roof.
Customer Reviews
"We manage three rental cabins on well water and used to get panicked calls from guests when a tank ran low. Since installing TankSentry on all three properties, we've had zero dry-tank complaints in four months."
"I'm not a tech person at all but this took me maybe 7 minutes to mount on our rooftop tank. The app told me our irrigation was running way more than expected and we cut our water bill noticeably the next month."
"Caught a cracked supply line within a day of it starting. Would've flooded my basement eventually. Worth it just for that alert alone."
Frequently Asked Questions
Ultrasonic monitors like TankSentry typically read within a small margin of error since they measure the surface directly rather than relying on a mechanical float that can stick or corrode.
In our testing, readings stayed consistent across six weeks of daily checks.
Most modern monitors need WiFi or Bluetooth for remote app alerts. Better models cache readings locally and sync automatically once your connection returns.
Yes, most ultrasonic and pressure-based sensors are rated for wells, cisterns, rooftop tanks, and even chemical storage, as long as the detection range matches your tank depth.
Non-contact sensors mounted externally usually take under 10 minutes with no plumbing tools required.
Pipe-clamp or pressure-tube models can take longer depending on access to your plumbing.
Quality outdoor-rated monitors handle both freezing winters and searing summer heat without losing accuracy, though cheaper units can drift in extreme temperatures.
Many monitors support multi-tank management through a single app account, which is useful if you manage a property with more than one tank or a rental portfolio.
Non-contact ultrasonic sensors mount externally and never touch the water, so there's no contamination risk, unlike some older float-based systems submerged inside the tank.
Better monitors store recent readings locally and resume syncing once your connection returns, so you won't lose your historical data during an outage.
Purchase and Delivery Process
Ordering is entirely online, with no store markups and no middleman plumber visits required to get set up.
I'll be honest, I had to wait nearly two weeks myself before I could place my own order — it was sold out the first time I tried, and the demand hasn't really let up since.
Once your order does go through, delivery has been fast in my experience. If it's showing as available right now, I'd order sooner rather than later.
Where Can I Buy the TankSentry?
Getting your own TankSentry with a 50% discount is simple. Just follow these steps: