Detector + Shutoff Combo Systems Compared: 9 Systems by Scope and Trigger Type

A detector + shutoff combo system pairs leak sensing with an automatic valve so the water actually turns off when a problem is found, instead of just sending you an alert while the leak keeps running. That’s the core difference from buying a standalone leak detector and a separate shutoff valve on your own: with a combo system, the sensor and the valve are designed by the same manufacturer to talk to each other out of the box, whereas assembling components yourself means confirming compatibility between brands. Not every product marketed with “leak detector” language actually includes a valve — this guide only covers products whose listings explicitly describe an automatic shutoff mechanism, and it distinguishes whole-home systems from kits scoped to a single appliance like a water heater, ice maker, or washing machine. Research-based comparison — we have not physically tested these products. Our analysis uses manufacturer specifications, manuals, warranty/support policies, safety certifications, independent test data where available, and current marketplace availability.

Comparison Table

Products below are grouped by price tier, from lower-cost appliance-specific kits to whole-home smart shutoff systems. “Scope” indicates whether a product protects your entire home’s water supply or is designed for one appliance or fixture; “Power/Hub” notes what the unit needs to operate.

Product	Brand	Price Tier	Scope	Power/Hub	Key Details
FloodStop Water Heater Leak Detector Kit	FloodStop	$75-200	Appliance-specific (water heater)	AC/DC, 4 AA optional; hub not stated	3/4″ NPT MIP x FIP fitting, wall-mounted control unit, no wireless connectivity stated
E-SDS Water Leak Detector with Shutoff Valve	E-SDS	$75-200	Appliance/fixture-specific (single 3/4″ supply line)	Corded electric; hub not stated	3/4 NPT brass ball valve, 19.68-foot sensor cable range, wall mount, manual open/close buttons
MT6LD Safety Valve-Leak Detector	Mountain Plumbing	$75-200	Not specified in listing (limited manufacturer detail)	Not stated; hub not stated	Pipe size, range, and mounting are not stated by the manufacturer’s listing
FloodStop Ice Maker Leak Detector Kit	FloodStop	$200-500	Appliance-specific (ice maker)	Not stated; hub not stated	1/4″ compression fitting, solid brass ball valve rated to 140 PSI, no wireless connectivity stated
Smart Valve Controller (Z-Wave, 1″ Ball Valve)	EcoNet Controls	$200-500	Whole-home (main-line valve)	Not stated; Z-Wave hub required	1″ integrated ball valve, Z-Wave Plus certified, 11 lbf motor closes valve in 18 seconds
Watts A2C-SC Intelliflow Washing Machine Shutoff Valve	Watts	$200-500	Appliance-specific (washing machine)	Not stated; WiFi, hub not stated	1/2″ valve, floor-mounted leak sensor, text and email alerts, inlet adapters included
Moen Flo 3/4″ Smart Water Shut Off Valve	Moen	$500+	Whole-home (main-line valve)	AC power; WiFi, no hub required	Learns usage patterns to flag abnormal flow, app/phone/email alerts, remote app control
Moen Flo 1-1/4″ Smart Water Shut Off Valve	Moen	$500+	Whole-home (main-line valve, larger pipe)	Corded electric; WiFi, no hub required	Same usage-learning and alert system as the 3/4″ model, sized for 1-1/4″ supply lines
H2Wise+ Smart Home Water Monitor and Shutoff Valve	Kohler	$500+	Whole-home (main-line valve)	Not stated; hub not stated	Ultrasonic flow and pressure sensors sampling 240x/second, KOHLER Konnect app, Alexa/Google Assistant voice control

What These Specs Mean for Your Decision

The first fork in the road is whole-home versus appliance-specific coverage, and it’s worth being precise about which you’re actually buying. The Moen Flo 3/4″, Moen Flo 1-1/4″, EcoNet Smart Valve Controller, and Kohler H2Wise+ are all designed to install at or near your home’s main water line, monitoring and shutting off water for the entire structure. By contrast, the FloodStop Water Heater Kit, FloodStop Ice Maker Kit, and Watts Intelliflow Washing Machine Valve are scoped to one appliance each — they only protect the specific supply line they’re installed on, not the rest of your plumbing. That distinction matters more than price tier when deciding what you’re actually protecting against: a $200-500 appliance-specific kit on your washing machine won’t do anything for a pipe leak in your basement.

Hub and platform requirements are the second major branch point. The EcoNet Smart Valve Controller explicitly requires a Z-Wave hub, meaning it won’t function as a standalone product — you need existing or planned Z-Wave infrastructure (SmartThings, Hubitat, and similar platforms are listed as compatible) before this unit makes sense. The Moen Flo units and Kohler H2Wise+ connect via WiFi and manage everything through their own manufacturer apps (Moen’s Smart Water Network app and KOHLER Konnect, respectively) without requiring a separate third-party hub. Several products in this list — including both FloodStop kits, the E-SDS valve, the Mountain Plumbing unit, and the Watts valve — simply don’t state a hub requirement in their listings, so if smart-home integration matters to you, confirm compatibility directly with the manufacturer before ordering.

Pipe size and fitting type will determine whether a product physically fits your plumbing at all. Fittings here range narrowly to specifically: the FloodStop Ice Maker Kit uses a 1/4″ compression fitting sized for a small appliance line, the Watts washing machine valve uses 1/2″, the FloodStop Water Heater Kit and E-SDS valve both use 3/4″ NPT threading, and the EcoNet controller integrates a full 1″ ball valve suited to a main line. The two Moen Flo models are differentiated primarily by pipe size — 3/4″ versus 1-1/4″ — so match the model to your home’s actual main-line diameter rather than assuming one size fits all situations. Several listings (Moen Flo, Mountain Plumbing) don’t state pipe size at all, so verify with the manufacturer before purchase if this is a firm requirement.

Notes on Each Product

FloodStop Water Heater Leak Detector Kit

This kit pairs a 3/4″ NPT MIP x FIP shutoff valve with FloodStop’s detection hardware, scoped specifically to a water heater installation rather than whole-home coverage. It’s wall-mounted and runs on AC power with an optional 4-AA battery backup. The listing states no wireless connectivity, so alerting is local: the control unit itself sounds the alarm. The manufacturer’s feature bullets describe the valve closing and sounding an alarm as soon as water is sensed, and staying closed until the water loss condition clears.

E-SDS Water Leak Detector with Shutoff Valve

E-SDS markets this unit for laundry, water heater, and similar single-line installations rather than as a whole-home system — it’s built around a 3/4 NPT brass ball valve intended to attach to one existing supply line. It’s corded electric, wall-mounted, and includes a stated sensor cable range of 19.68 feet, along with manual open/close buttons and a reset button on the central unit. An 80-decibel alarm and flashing LED accompany the automatic shutoff when a leak is detected.

MT6LD Safety Valve-Leak Detector

Mountain Plumbing’s listing for this product is notably sparse on specifications — power source, connectivity, pipe size, mounting, and range are all not stated, and the manufacturer’s own feature bullet reads simply “Style: Default.” Based on the product name it functions as a safety valve paired with leak detection, but buyers should contact the manufacturer directly to confirm scope, fitting size, and installation requirements before ordering, since this listing provides less detail than the others in this comparison.

FloodStop Ice Maker Leak Detector Kit

This is the smallest-scope product in the lineup, built for a single ice maker supply line using a 1/4″ compression fitting. FloodStop’s feature bullets describe roughly a 15-minute install, a heavy-duty solid brass ball valve rated to 140 PSI, and both visual and audible alarms. Because it’s sized for one small appliance line, it won’t affect water supply to the rest of the home — the manufacturer notes it leaves other household fixtures operational when triggered.

Smart Valve Controller (Z-Wave, 1″ Ball Valve)

EcoNet Controls’ unit is the only product in this comparison that explicitly requires a separate hub — Z-Wave Plus specifically — and lists broad platform compatibility including SmartThings, Wink, Hubitat, Nexia, Control4, and Honeywell among others. It integrates a full 1″ ball valve suited to a main water line, and the manufacturer states an 11 lbf-torque motor that opens or closes the valve within 18 seconds. Z-Wave Plus’s stated wireless range is up to 30 meters, per the manufacturer.

Watts A2C-SC Intelliflow Washing Machine Smart Water Shutoff Valve

Watts scopes this valve specifically to a washing machine connection, using a 1/2″ fitting with included inlet adapters. It combines a floor-mounted leak sensor with a WiFi-connected valve, and the manufacturer’s bullets describe real-time text and email alerts along with continuous monitoring of both water flow to the machine and moisture behind it. Setup involves scanning a QR code and registering the device online to connect it to a local WiFi network.

Moen Flo 3/4″ Smart Water Shut Off Valve

Moen’s Flo system installs at the main line and is designed for whole-home coverage rather than a single appliance. It runs on AC power, with a CR123A lithium cell as backup, and connects over WiFi — the listing states no Bluetooth. The manufacturer describes the system learning household water-usage patterns over time to flag abnormalities like continuous running water, with automatic shutoff triggered when a probable leak is identified, plus app, phone call, and email alerts and remote control through Moen’s Smart Water Network app.

Moen Flo 1-1/4″ Smart Water Shut Off Valve

This is the larger-pipe version of Moen’s Flo system, sized for 1-1/4″ main lines rather than the standard 3/4″ model, and it’s corded electric rather than listing a battery-backup option. Functionally, the manufacturer describes the same usage-learning shutoff logic, alerting, and app-based control as the 3/4″ model — the primary difference in the listing data is pipe fitting size.

H2Wise+ Smart Home Water Monitor and Shutoff Valve

Kohler’s H2Wise+ is positioned as a whole-home monitoring and shutoff system, with the manufacturer describing ultrasonic flow sensing combined with high-definition pressure sensors that sample water conditions 240 times per second. Control runs through the KOHLER Konnect app, with stated compatibility for Alexa and Google Assistant voice commands. Kohler’s own marketing bullets call out extended-absence scenarios — Airbnb hosts, landlords, and seasonal or vacant homes — as a use case for the automatic shutoff feature.

Combo System or Separate Detector + Valve?

An integrated combo system makes the most sense when you want the sensor and the valve guaranteed to work together without doing that compatibility research yourself — the tradeoff is that you’re generally locked into one manufacturer’s sensors, app, and (in some cases, like the EcoNet controller) hub ecosystem for future expansion. If you already own leak sensors you’re satisfied with, or you want to shop detection and shutoff hardware independently by price and feature set, buying components separately can be more flexible, though it puts the compatibility burden on you. Our Detector + Shutoff Combo Systems category guide covers the broader decision points — subscription requirements, plumbing material compatibility, and flow-sensing versus point-sensor triggering — in more depth, and our Leak Detector vs. Automatic Shutoff Valve guide breaks down whether you need shutoff capability at all versus alarm-only detection.