src="" height="0" width="0" style="display:none;visibility:hidden">
10 Differences Between Flow Meter And Water Meter
by Team Kritsnam

The confusion between "flow meter" and "water meter" is common; however, when we’re discussing flow meter vs water meter, it's crucial to clarify that while all water meters are essentially flow meters, the reverse isn't always true.

Therefore, for a layman, the most noteworthy difference between flow meter and water meter is that a water meter quantifies the volume of water passing through. In contrast, a flow meter gauges the speed of the liquid flow.

Another significant difference lies in their applications—water meters are exclusive to water measurement. In contrast, flow meters are used in various industrial settings, measuring liquids like oil, milk, honey, and even gases.

What is a Water Meter?

water running from a tap
Image via Pexels by Skitterphoto

A water meter is a device used to measure the total volume of water passing through a pipe. Its primary application lies in assessing and billing water usage for residential and commercial purposes.

A water meter is an indispensable tool for accurately determining and charging for the consumption of water supplied by the Municipal Corporation to users.

Reading this meter is handy for homes to check if water bills are correct and if there are any leaks. You can figure out how much water you've used by deducting the previous reading from the current one.

This whole process helps you understand your regular water use, makes sure you're paying a fair amount, and signals if there are any strange changes in water bills.

What is a Flow Meter?

water coming from a tap
Image via Pexels by Marcelo Chagas

A flow meter is a specialized instrument designed for gauging the nonlinear or linear mass or volumetric flow of water, gases, oil, or vapors. In simpler terms, it is a device that measures how fast liquids or gases are moving.

It does this by sensing and keeping track of changes in parameters like pressure, level, or some other variables. However, when it comes to water flow measurement, choosing the right meter for water flow monitoring objectives is very important.

Applications of Flow Meter

applications of flow meter
Image via Pexels by David Yu

One important feature when we consider flow meter vs water meter is the applications of flow meters in various industries. Here are three prominent examples:

  • Oil & Gas: In this industry, flow meters are crucial for measuring the volume of liquids and natural gases at different points in the production process. They help track the flow of oil and gas, ensuring accurate measurements as they travel long distances.
  • Food & Beverage: This industry counts on flow meters due to high water consumption and significant wastewater discharge. Efficient production processes, optimized with flow meters, help manage costs related to water supply and waste disposal, especially considering factors like global competition, rising raw material costs, and energy expenses.
  • Wastewater & Water Supply: Flow meters are essential in the water industry, from managing wastewater to supplying drinking water. They help accurately measure sewage and waste, preventing clogs in systems.

Recommended Read: Science Behind Water Flow Measurement

Types of Water Meters and Flow Meters

Multiple types of water meters and flow meters are available in the market, and you should select one that meets your requirements and budget. Here are a few types of water meters.

Mechanical Meters

Mechanical meters rely on moving parts like pistons or impellers to measure water flow. These components in motion are essential for tracking and determining the volume of water passing through the meter.

Electromagnetic Meters

The electromagnetic meter operates without moving parts. Instead, they utilize electromagnetic waves to measure the speed or volume of water flow precisely, offering a different approach compared to mechanical meters.

Ultrasonic Meters

The ultrasonic meters utilize sound waves passing through water for measurement. There are two subtypes within this category:

  • Transit Time Meters: These meters leverage the varying speed of sound when traveling with or against water flow. Placed strategically with two transducers on either side of a pipe-like chamber, they accurately gauge flow rate and volume.
  • Doppler Meters: Particularly effective for assessing volume or speed, Doppler meters rely on sound reflections from impurities like bubbles or dirt, making accuracy contingent on the presence of these elements.

Recommended Read: Detailed Guide To Different Types Of Flow Meters

How do Flow Meters and Water Meters Work?

Apart from understanding more about flow meter vs water meter, knowing how they work is essential. They both share key components explained below.

  1. Sensor for Detecting Flow: Both types have a sensor detecting the flow of water or any substance they are measuring.
  2. Transducer for Signal Conversion: A transducer is there to convert and send out the flow signal. It's like the messenger, ensuring the information reaches the next stage.
  3. Counter for Tracking Volume: The counter keeps tabs on the volume of water flowing through the sensor. By mapping the pulses sent through the meter, it figures out the volume or speed of the flow.
  4. Indicator for Display: Finally, an indicator shows the meter reading. This is like the display screen, making it easy for users to understand the measurements.

Recommended Read: The Ultimate Guide To Flow Meter Installation For Best Accuracy

Flow Meter vs Water Meter

Now that we know precisely what these devices are and what the fundamental difference between the flow meter and water meter is, let's dive deep into a few more distinctions as far as a flow meter vs. water meter is concerned.

  • Water Meters for Bills and Efficiency: These are mainly used to calculate water usage for billing. The ones using AMR/AMI technology give real-time data to the utility and customers, saving the hassle of manual readings.
  • Flow Meters for Monitoring Safety: Flow meters have a broader use, especially in gas applications. They continuously measure gas flow, which is crucial for spotting leaks or blockages that could be dangerous.
  • Accuracy Measures: Water meters have two accuracy measures – high and low range. The average determines the correct reading for billing and monitoring water use. Meanwhile, for flow meters, accuracy relies on linearity (staying within design limits) and repeatability (consistent results under the same conditions). This is crucial for safety in gas applications, unlike water meters that use high and low-range measurements.

Recommended Read: Different Methods To Validate The Accuracy Of Flow Meter On The Field?


So when we are talking about flow meter vs water meter, while they both might look alike, telling them apart is easy. If it involves your water bill, it's a water meter. For measuring the speed at which gases or fluids are passing through, it's undoubtedly a flow meter. This basic difference between a flow meter and water meter makes identifying which meter suits your specific measurement requirements easy.

© Kritsnam Technologies. All rights reserved.
+91 9703640123 9:00 am - 6:00 pm, Mon to Sat
Main Branch: Plot Number 347, Road Number 22, Jubilee Hills,
Hyderabad, Telangana - 500033,
CIN : U72200TS2015PTC175820

Manufacturing Site: Sy No:- 124/2 & 126, Yamnampet Village,
Ghatkesar Mandal, Medchal,
Hyderabad, Telangana - 501301