Watflow DN20 Water Meter 3/4ft NPT Gallon Flow Meter - Accurate

In this review of the Watflow DN20 water meter, the bottom line is simple: it is a solid choice for homeowners and light industrial users who need a durable, accurate cold water meter with 3/4' NPT fittings for gallon-based measurement. The reviewer found the build quality and corrosion-resistant eco-brass construction reassuring for outdoor garden or factory service, and the meter's accuracy across normal and low flow ranges makes it a reliable option for monitoring consumption or integrating with pulse monitoring systems.

Key Features

• Corrosion resistance: The main case and measuring chamber are made from eco-brass alloy to resist corrosion in outdoor and industrial environments.
• 3/4' NPT compatibility: Equipped with 3/4' NPT couplings, the DN20 fits common US installations and measures in gallons for easy readout and system integration.
• Measured accuracy: The meter delivers a maximum permission error of about 1.5% in the normal flow range and 3% at low flows, which is suitable for most residential and light industrial monitoring.
• Wide flow range: The device handles flows from a 0.25 GPM minimum up to a 20 GPM peak, with continuous operation rated around 10 GPM for steady use.
• Serviceable filter: A removable filter at the inlet allows cleaning without breaking the metrological seal, simplifying maintenance.
• Dry type register: The top-loaded, dry register makes reading easier and protects the counter from moisture for longer life.

Who It's For

The Watflow DN20 is best for homeowners, small farms, irrigation setups and light industrial or factory applications that need a reliable cold water meter with standard 3/4' NPT fittings and gallon units. It is particularly useful when users want a sturdy metal body and a meter that can be cleaned without recalibration concerns.

Those who need potable-water certification or integrated advanced telemetry out of the box should look elsewhere; this model is described as no potable and is focused on basic pulse monitoring compatibility rather than full remote telemetry or specialized certification for drinking water systems.

Pros & Cons

Pros

• Solid eco-brass construction gives good corrosion resistance and perceived long life.
• Accurate within 1.5% in normal flow and reasonably accurate at low flows, matching customer reports of good measurement for pulse systems.
• Easy to install with common 3/4' NPT couplings and a dry register that is simple to read.
• Serviceable inlet filter allows cleaning without breaking the metrological seal.

Cons

• Not specified for potable use, so it is not suitable where drinking-water certification is required.
• Advanced telemetry or remote read options are not included and would require additional equipment.

Specifications

Model	DN20 (3/4' NPT)
Thread type	3/4' NPT couplings
Units	Gallon
Flow range	Minimum 0.25 GPM, Continuous 10 GPM, Max 20 GPM
Accuracy	Normal flow 1.5%, Low flow 3%
Body material	Eco-brass alloy main case
Register	Top-loaded dry type

Our Verdict

The Watflow DN20 is a practical, cost-conscious water meter for non-potable cold water applications where durability and reasonable accuracy matter. It is a good value for homeowners, gardeners and light industrial users who need a metal-bodied, easy-to-service meter with standard 3/4' NPT fittings and gallon readings, provided potable certification or built-in remote telemetry are not required.

Frequently Asked Questions

Can this meter be used for irrigation and garden systems?
Yes. Its eco-brass body and 3/4' NPT fittings make it well suited for garden and irrigation use, and the inlet filter simplifies maintenance.

Is the register protected from moisture?
The meter uses a top-loaded dry type register, which keeps the counter protected from moisture and makes readings easier.

Does it support pulse output for monitoring systems?
Customers report it works well with pulse monitoring systems, though external telemetry modules would be needed for remote data transmission.