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How to Choose the Best HVO Model

HVO gives you a choice between a basic, reliable product, dubbed the Classic Plus™️, and the Pro Plus™, which has a built-in ultrasonic oxygen sensor, and is “cloud-connected”, with sophisticated data tracking, monitoring, and configuration options. In this post, you’ll learn the differences between them, and how to decide which is best for your application.

Classic Plus™️

A no-frills oxygen-generating system that is safe, reliable, affordable, and easy to service. It supports configurable pressure setpoints of 50-175 PSI. It comes with an oxygen concentrator warm-up feature that enables you to delay the storage of generated oxygen until high purity is attained. Choose a delay of 0, 30, 60 or 90 seconds.

Typical applications include torchwork glass, scientific glass, and glass hot shops, wastewater treatment and other applications that are not life-supporting.

Pro Plus™️

Extends the capabilities of the Classic Plus™️ by adding the following features:

  • 5″ touchscreen that displays HVO System status information and provides access to settings such as Wi-Fi configuration and connection status
  • Ultrasonic oxygen sensor measures the O2 percent of generated oxygen
  • Additional sensors that measure tank pressure, gas temperature, and enclosure temperature
  • Cloud Monitoring features that enable your HVO System sensor data to be transmitted to the cloud

Typical applications include veterinary medicine, aquaculture, and horticulture.

Real-Time Monitoring and Notification

The Seeing Eye™️ web portal allows you to view a graph of recorded metrics. A cloud monitoring service notifies interested parties via text and/or email about system issues such as high system temperature or low oxygen purity.

In addition, the Pro Plus™ is equipped with a 5″ touchscreen that displays the current sensor readings, such as tank pressure and oxygen purity.

Lastly, the Pro Plus™ is able to receive software updates from the cloud. This ensures that your system is able to benefit from features and fixes that come along in the future.


For both the Classic Plus™️ and the Pro Plus™️, you may choose one of the following compressors:

 Mighty Mite: Achieves a tank pressure of 160 PSI with oxygen input of up to 36 LPM. Requires a minimum of two 10 LPM oxygen concentrators.

 Titan 1: Achieves a tank pressure of 160 PSI. Accepts as much as 54 LPM of input and requires a minimum of three 10 LPM oxygen concentrators.

 Titan 2: Achieves a tank pressure of 175 PSI. Accepts as much as 63 LPM of input and requires a minimum of three 10 LPM oxygen concentrators.

The input flow is the sum of the gas produced by the oxygen concentrators connected to the HVO system.  The PSA oxygen concentrators that we recommend are rated for 10 LPM each. We recommend 10 LPM concentrators, all of the same make and model. Specifically, we advise against mixing concentrator types (brands, models, output ratings) in a single system, as variations in pressure can reduce efficiency.

Oxygen Storage Tanks

HVO oxygen storage tanks come in 30, 60, and 80-gallon sizes. Having lots of stored oxygen is beneficial when oxygen usage spikes. However, if your usage regularly exceeds what the system is generating, you will need more input, i.e. more concentrators, and possibly more compressors (Drones).

HVO storage tanks are oxygen-rated, meaning that they are designed and treated to store oxygen safely.

What’s the best combination of options?

Here’s a list of important questions to help you decide which model, compressor, and tank size to choose:

  • What is the required oxygen flow rate? HVO specialists can help you figure out the average flow rate you require based on your application and equipment. Contact us at 402-476-0555 to discuss your needs and requirements.
  • How consistent is your oxygen usage throughout the day? For variable or sporadic usage you may want a larger storage tank, or perhaps an extra storage tank and one or more extra oxygen concentrators to handle peak usage periods.
  • How likely is it that your overall oxygen usage will grow over time? If you plan to add concentrators, you may opt for a 5-outlet relay box instead of the 3-outlet model. If there’s uncertainty, keep in mind that the HVO System is modular and expandable, so you can start small and add components as your usage increases.

Remember that the larger the tank size and the higher the maximum tank pressure, the more stored oxygen will be available to handle peak usage. Find out exactly how much oxygen is stored for the various pressures and tank sizes on the Classic Plus™ page.

Here are some scenarios:

Scenario 1: Small
You require 15 LPM of constant oxygen output at a pressure of 30 PSI. Consumption doesn’t vary much throughout the workday. In this case, we recommend an HVO Mighty Mite 30 gallon system with two 10 LPM oxygen concentrators.

Scenario 2: Medium
You require 30 LPM of constant oxygen output most of the time, with occasional peak usage of 50 LPM, and an output pressure of 50 PSIG. In this case, a Mighty Mite 60 gallon system with three 10 LPM oxygen concentrators is your best choice. To store more oxygen for use during peak usage periods, purchase a larger (or additional) storage tank.

Scenario 3: Large
You need 50 LPM of constant oxygen output with periodic, burst usage of 80 LPM. The Titan 1 will be your most economical choice here, as you’ll be able to attach six 10 LPM oxygen concentrators. Another way to grow an HVO system is by adding Drones and/or storage tanks. For more information, see the post “How to expand your HVO system.”

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