Choosing a water sub meter for apartments requires balancing accuracy, durability, and ease of installation. The following five meters are selected for common multi-unit setups, offering reliable measurements for shared-water systems, irrigation, and utility billing. Each option emphasizes corrosion-resistant materials, standard 3/4″ NPT connections, and clear readouts to simplify monitoring and billing. The list covers meters suitable for indoor or outdoor use, horizontal installations, and pulse output options for integration with home automation or billing hardware.
| Product | Brand | Key Feature |
|---|---|---|
| Watflow DN20 Water Meter 3/4″ NPT | Watflow | AWWA certification, pulse output, corrosion-resistant eco-brass, suitable for apartments |
| Watflow DN20 AWWA C708 Certification | Watflow | Pulse output, rugged construction, tested for residential water use |
| Watflow DN20 AWWA C712 Certification | Watflow | High-accuracy flow measurement with durable brass components |
| RESTMO Water Flow Meter with Brass Inlet | RESTMO | Brass inlet, four modes (Flow, Consumption, Average, Total), easy readout |
| RESTMO Water Flow Meter with Brass Inlet & Outlet | RESTMO | Brass inlet/outlet, reliable multistage measurement modes |
Watflow DN20: 3/4″ NPT Water Meter
The Watflow DN20 water meter uses a corrosion-resistant eco-brass main case and measuring chamber with a head ring, designed for reliable water metering in apartment buildings. It is compatible with 3/4″ NPT connections and reports measurements in gallons, fitting common U.S. usage. The meter lists accuracy within ±1.5% across normal flow, with ±3% at low flow, a maximum flow rate around 20 GPM, a minimum of about 0.25 GPM, and continuous flow capabilities up to 10 GPM. This combination supports precise tracking of individual unit water usage for billing and monitoring.
Watflow DN20 AWWA C708 Meter
This Watflow model carries AWWA C708 certification and a pulse output option, making it suitable for integration with demand meters, building management systems, and automated billing setups in apartment complexes. The 3/4″ NPT fittings ensure straightforward installation on standard service lines. Expected performance includes corrosion-resistant construction and reliable measurement suitable for continuous monitoring of cold water usage in individual units. The design emphasizes ease of installation and long-term durability in residential environments.
Watflow DN20 AWWA C712 Meter
The DN20 AWWA C712 Watflow meter combines a corrosion-resistant main case with a robust measuring chamber, delivering precise flow readings for residential water usage. With 3/4″ NPT couplings, it suits common apartment supply lines and supports consistent, dependable billing data. The meter advertises similar accuracy to other Watflow DN20 variants, aiming to minimize under- or over-billing across multiple units in a building. This option is suitable where higher-certification compatibility with water utilities is preferred.
RESTMO Brass Inlet Water Flow Meter
This RESTMO model features a pure brass inlet and metal-threaded connection for enhanced durability and easier installation on hoses or faucets. It includes an easy-to-read LCD and a one-touch control button. With four modes—Flow, Consumption, Average, and Total—it provides real-time monitoring alongside usage history, weekly averages, and cumulative totals. The brass design helps resist corrosion in outdoor or high-humidity apartment installations, supporting robust, long-term performance.
RESTMO Brass Inlet & Outlet Flow Meter
The RESTMO unit with brass inlet and outlet extends the durability to both ends of the flow path, offering a reliable, heavy-duty connection suitable for apartment exterior spigots and garden feeds. It shares the same LCD readout and four-mode operation, empowering building managers or residents to track real-time flow, recent usage, weekly averages, and total consumption. This configuration is particularly advantageous where longer service lines or more rugged outdoor environments are involved, reducing maintenance needs over time.
Buying Guide: Key Purchase Considerations
When selecting a water sub meter for apartments, consider these factors to ensure effective performance and best value:
- Measurement accuracy: Look for meters with ±1.5% to ±3% accuracy across typical residential flow ranges. Higher certification (AWWA) can offer added assurance for utility-grade billing.
- Connection and installation: A standard 3/4″ NPT thread is common in residential service lines. Verify whether horizontal or vertical installation is supported by the model and by the building’s plumbing configuration.
- Durability and materials: Corrosion-resistant components, such as eco-brass or brass alloys, extend life in humid or outdoor settings and reduce maintenance requirements.
- Pulse output and integration: If you plan to feed data into a billing system or smart-home controller, choose meters with pulse output or compatible data interfaces.
- Operating environment: Outdoor meters should resist weather exposure, while indoor installations may prioritize compact form and leak resistance.
- Maintenance and readability: An LCD display and straightforward button controls ease daily checks by residents or property staff, supporting accurate ongoing billing.
- Certification and compatibility: AWWA certifications (C708, C712) indicate compliance with industry standards and compatibility with utility systems.
- Availability of spare parts and support: Ensure the model has readily available replacement parts and accessible customer support to minimize downtime.
Across apartment settings, combining a durable physical meter with a clear readout and compatible data interfaces yields the most reliable control over shared water usage. The featured models provide a spectrum of options—from basic, robust meters suitable for standard installations to certified variants with pulse output for automated monitoring—allowing building managers to tailor installation to their specific density, climate, and billing approach.