Latest / Internet of Things with Fexingo: Connected Devices, Sensors, and Industrial IoT / How IoT Sensors Are Preventing Water Leaks in Apartment Buildings
Transcript
- Lucas: So you get a call at two in the morning from your downstairs neighbor. Water is dripping through their ceiling. You rush home, open your apartment door, and your hardwood floor is a shallow lake. Luna: That's basically a nightmare scenario for anyone living in a multi-unit building. And it happens way more often than people realize. Lucas: It does. And the crazy part is, by the time you see the water, the leak has probably been going for hours — sometimes days. A pinhole leak in a pipe no bigger than a needle can spray 250 gallons of water a day. Luna: Two hundred and fifty gallons. That's a bathtub every few minutes. Lucas: Right. And in a building with a hundred units, one undetected leak can lead to a claim of fifty thousand dollars or more. Insurance data shows that water damage is the second most common property claim after wind and hail, and it's actually the most expensive — average claim is about ten thousand dollars for a single-family home, but for multi-family buildings it's five times that. Luna: So what's the IoT solution here? Because I'm picturing some kind of moisture sensor that sits on the floor and beeps when it gets wet. Lucas: That exists, but that's reactive — you're already wet. The interesting stuff is happening with acoustic sensors that listen for leaks before there's any visible water. A company called Phyn makes a sensor that you clamp onto the pipe itself. It uses ultrasonic sound waves to detect the unique signature of a leak — the sound of water escaping under pressure. Luna: So it's like a stethoscope for your plumbing. Lucas: Exactly. They've built a library of leak signatures — pinhole, hairline crack, loose fitting — and the sensor uses machine learning on the edge to classify what it's hearing. Then it sends an alert to a central hub, and if the leak is above a certain threshold, it can automatically shut off the building's main water valve via a motorized actuator. Luna: Okay, that sounds impressive. But every apartment has multiple water points — sink, toilet, shower, dishwasher, washing machine. Are you putting a sensor on every single pipe? Lucas: Not exactly. The typical setup in a multi-family building is one sensor per unit, usually on the main cold water line entering the apartment. But in newer retrofits, they're adding sensors to individual fixtures — especially dishwashers and washing machines, which are the most common sources of catastrophic leaks. Luna: And this runs on batteries? Because I doubt landlords want to run wiring through every wall. Lucas: Yeah, they're battery-powered, and the batteries last about five years. The sensors communicate over a mesh network — so each sensor relays data through other sensors until it reaches a gateway that connects to the cloud. That means you don't need Wi-Fi in every apartment. Luna: Smart. So what's the real-world track record? Has anyone actually deployed this at scale? Lucas: There's a great case study from a 200-unit luxury building in Manhattan. They installed Phyn sensors in every unit back in 2023. Over the next 18 months, the system detected 47 micro-leaks — things like a slowly weeping toilet flapper or a pinhole in a copper pipe behind a wall. In three cases, it automatically shut off the water before any damage occurred. Luna: 47 leaks in 200 units? That's a 23 percent failure rate. That seems high. Lucas: It does sound high, but it's actually typical for a building of that age — most of those pipes were installed in the 1980s. The property manager told Phyn that their water damage claims dropped by 74 percent year-over-year. Think about that: from roughly four major claims a year down to one. At an average claim cost of fifty thousand dollars, that's a hundred and fifty thousand dollars in savings annually. Luna: Okay, that math is compelling. But what's the upfront cost? Landlords are famously hesitant to spend money on things tenants can't see. Lucas: The full system — sensors, gateway, actuator, installation — runs about 35,000 dollars for a 200-unit building. That's 175 dollars per unit. If you avoid even one major water claim, the system pays for itself. And now some insurance companies, like Travelers and Chubb, are starting to offer premium discounts of five to ten percent for buildings with certified leak-detection systems. Luna: So it's not just a technology story — it's an insurance story. That might actually get landlords to move. Lucas: Right. And that's the angle that's interesting to me. The technology has been reliable for years, but adoption was slow because property owners didn't see the direct financial incentive. Now that insurers are literally offering to cut their premiums, the economics flip. It's no longer a nice to have smart building gadget — it's a risk management tool with a clear return on investment. Luna: I want to ask about false positives. Because if the system triggers a shutoff at 3 AM because someone's toilet is running, and the whole building loses water until a super can reset it, that's going to create a lot of angry tenants. Lucas: That's a great question, and it's the biggest operational challenge. Phyn's algorithms are tuned to distinguish between a running toilet and a genuine leak, but no system is perfect. The company says they've reduced false positives by 80 percent since 2022 by adding a second-stage confirmation — the sensor listens for 30 seconds before triggering a shutoff, and it requires two separate sensors to agree before acting. Luna: Still, I bet property managers are nervous. Nobody wants to be the person who accidentally shut off water to the entire building. Lucas: That's why most buildings start with a 'monitor only' mode — alerts go to the property manager's phone, and they decide whether to send a plumber or shut off the water manually. The automatic shutoff is usually reserved for high-risk fixtures like washing machines, where the potential damage is enormous. And you can override it remotely from a smartphone. Luna: That makes sense. So the system learns over time, too. It's not just a dumb sensor — it's an AI that gets smarter about what's normal for that specific building. Lucas: Exactly. And that's where the long-term value is. After a year of data, the system can predict which units are most likely to have a leak based on flow patterns and pipe material. The property manager can proactively replace a failing valve before it bursts. We're moving from reactive repairs to predictive maintenance. Luna: So what's the adoption rate looking like? Are we going to see these sensors in every new apartment building from now on? Lucas: Adoption is still early — maybe 5 percent of multi-family buildings in the US have some form of smart leak detection today. But the market is growing fast. A report from MarketsandMarkets projects the smart water management market will grow from 12 billion dollars in 2024 to 28 billion by 2029. And a lot of that growth is being driven by insurance requirements. Some large property owners, like Equity Residential, have already started retrofitting their entire portfolios. Luna: If today's conversation gave you something useful — maybe you're a property manager or a renter wondering if your building has this tech — these episodes stay ad-free because of listener support. If that matters to you, you can help keep it going at buy me a coffee dot com slash fexingo. No pressure, just a way to say this is worth doing. Lucas: Yeah, and we really do appreciate it. It's what lets us dig into stories like this without any sponsor influence. Luna: So back to the building retrofits — are there any particular challenges with older buildings? I'd imagine the pipe materials and layouts are more varied. Lucas: Great point. Older buildings often have galvanized steel or cast iron pipes, which can corrode and develop leaks in unpredictable places. The acoustic sensors actually work better on metal pipes than on plastic — they transmit sound better. But the bigger challenge is that older buildings may not have a single main shutoff valve that's accessible. In some cases, you have to install a new valve, which adds cost. Luna: So the 175-dollar per unit figure is for a relatively straightforward install. It could go higher for a pre-war building with tricky plumbing. Lucas: Exactly. But even at 300 dollars per unit, the math still works if you're avoiding a 50,000-dollar claim every couple years. And there's another benefit that's harder to quantify: tenant retention. Nobody moves out because their apartment didn't flood. But plenty of people move out after a flood. So there's a happiness factor too. Luna: And it's also a water conservation story. If those 47 micro-leaks in the Manhattan building were left unchecked, they would have wasted an estimated 1.2 million gallons of water per year. Lucas: That's a huge number. In cities with water scarcity, that's not just a cost issue — it's a sustainability issue. A few buildings in Los Angeles have started piloting these systems with the Department of Water and Power, partly to qualify for rebates. So there's a public policy angle too. Luna: Are there any other companies besides Phyn doing this? Or is it basically one vendor? Lucas: Phyn is the most well-known in multi-family, but there's also a company called Grohe — they make the Sense, which is a simpler sensor that monitors water flow at the meter. And there's a startup called Flume that puts a sensor on the water meter itself and uses data analytics to detect anomalies. For single-family homes, there's Moen's Flo, which is a smart shutoff valve that installs at the main water line. Luna: So the market is getting crowded. That's usually a good sign that the technology is maturing and prices will come down. Lucas: I think so. We're at an inflection point where the hardware cost is dropping, the AI is getting more reliable, and the insurance industry is creating a financial incentive. My prediction is that within five years, most new multi-family buildings will have leak detection as standard, just like smoke detectors and fire sprinklers. Luna: That would be a huge shift. And it would save billions in property damage every year. I'm surprised it's not already required by building codes. Lucas: Some cities are starting to look at it. I know San Francisco's building department has been studying whether to mandate leak detection in high-rise residential buildings after a series of costly floods in the Financial District. But code changes take years. In the meantime, the market is moving faster than the regulators. Luna: So for a building owner listening to this — what's the first step? How do they get started? Lucas: I'd say start with a water audit. Check your insurance loss runs — if you've had a water claim in the last three years, you're a prime candidate. Then call a few vendors and ask for a pilot in your highest-risk units — maybe the ones above expensive retail spaces or the ones with old washing machines. Run the pilot for six months, track the alerts, and see if the system catches anything. Most vendors will do a pilot at cost because they want the case study. Luna: And if you're a tenant — can you do anything? Or are you stuck waiting for the landlord? Lucas: As a tenant, you can buy a simple water leak alarm for 15 bucks and put it under your sink. It won't shut off the water, but it will alert you before you have a lake in your living room. For renters who want more, some smart home hubs like the Samsung SmartThings have water leak sensors that can send a push notification. It's not as powerful as a building-wide system, but it's better than nothing. Luna: That's a good practical takeaway. And it shows that the technology is accessible at every level — from a 15-dollar alarm to a 35-thousand-dollar building retrofit. Lucas: Exactly. And I think that's the story of IoT in general — it starts with a cheap sensor and scales to a system that can prevent a catastrophe. Water leaks are just one example, but it's a compelling one because water damage touches almost every building, everywhere. It's not a niche problem. Luna: And it's a problem with a clear solution. That's always the best kind of episode.