What size smart water shutoff do I need?
Device size follows the verified incoming household water line and installation conditions—not a visual guess from a fixture branch or valve handle.
Question
What size smart water shutoff do I need?
Direct answer
Choose a smart water shutoff for the home's verified incoming domestic main—not by guessing from a nearby valve or fixture. HydroSense confirms nominal line size, pipe material, clearance, valve arrangement, PRV position, power, and connectivity. Qualifying 1.5-inch and 2-inch domestic mains use FloLogic as HydroSense's designated supported large-line family, with final model and equipment confirmed in writing.
What this means for your home: Photographs can help screen the project, but the written proposal follows verified plumbing and device compatibility.
HydroSense sizing map
How line size changes the supported approach
The table maps verified domestic-main size to HydroSense's current supported approach without guaranteeing a model before compatibility review.
| Incoming line | HydroSense approach | Published starting price | What must be verified |
|---|---|---|---|
| 3/4 inch | Compatible standard residential device | $999 | Domestic-main size, material, valve arrangement, clearance, power, connectivity, and device fit |
| 1 inch | Compatible standard residential device | $1,450 | Domestic-main size, material, valve arrangement, clearance, power, connectivity, and device fit |
| 1 1/4 inch | Compatible standard residential device | $1,875 | Domestic-main size, material, valve arrangement, clearance, power, connectivity, and device fit |
| 1 1/2 inch | FloLogic designated large-line family | $3,456 | Domestic-main size, material, clearance, flow needs, power, and final FloLogic configuration |
| 2 inch | FloLogic designated large-line family; commercial-grade context | $4,175 | Domestic-main size, material, clearance, flow needs, power, and final FloLogic configuration |
Sizing discipline
Nominal pipe size must be verified, not estimated
A domestic main can change material or diameter near a meter, pressure-reducing valve, transition fitting, or existing shutoff. Measuring the outside of insulation, a valve body, or a branch line can produce the wrong nominal size.
HydroSense identifies the incoming domestic main and confirms the size at the proposed installation location before selecting the device and fittings.
HydroSense field review
What HydroSense checks before quoting
The recommendation considers pipe material, existing valve condition, installation clearance, pressure-reducing-valve relationship, nearby power, required connectivity, protected placement, and the ability to test and service the installed system.
These conditions can change the placement, fitting package, device family, and whether corrective work is needed before the smart shutoff can be commissioned.
Large domestic mains
Why a 1.5-inch or 2-inch domestic main changes the device choice
Higher-flow and large-line applications require a supported valve architecture that fits the verified line and household demand. HydroSense uses FloLogic as its designated supported large-line device family for qualifying 1.5-inch and 2-inch domestic mains.
That is a HydroSense supported-device decision, not a claim that FloLogic is the only manufacturer worldwide for those sizes. The final configuration, model, power, clearance, and equipment are confirmed in the written proposal; 2-inch HydroSense scope remains commercial grade.
Related decisions
Continue with the pages that confirm device fit, price, and service availability.
Property-specific next step
Turn the guide answer into a written home scope.
HydroSense reviews service area, domestic-main conditions, device compatibility, power, connectivity, and exclusions before scheduling.