Frequently Asked Questions

Q -- Is financing available?

A -- Yes, and we recommend the following lending companies:

Q – Are the parts oxygen-rated?

A – Yes. For safety and longevity, we use only oxygen-rated, oil-free parts.

Q – Will the HVO System operate in my unheated workshop?

A – The HVO System can only operate in temperatures in the range from  45 F (7.2 C) to 100 F (37.8 C). 

Q How much oxygen fits in a tank?

A It depends on the size of the tank and the pressure. Our "Standard" compressor fills to 100 psi (6.9 bar), whereas the "Mighty Mite" and "MAX" compressors fill to 150 psi (10.34 bar). In the list below, cf = cubic feet, cm = cubic meters:

  • 20 gallon tank contains 21 cf (0.552 cm) @ 100 psi, and 30 cf (0.79 cm) @ 150 psi
  • 30 gallon tank contains 31 cf (0.815 cm) @ 100 psi, and 45 cf (1.18 cm) @ 150 psi
  • 60 gallon tank contains 63 cf (1.66 cm) @ 100 psi, and 90 cf (2.37 cm) @ 150 psi
  • 80 gallon tank contains 84 cf (2.2 cm) @ 100 psi, and 120 cf (3.15 cm) @ 150 psi

Q – Is there a warranty?

A – Yes. All HVO Systems and HVO Drones come with a three year warranty. New Respironics oxycons purchased through HVO are also covered by a 3 year warranty.

Q – What sort of electrical power do I need?

A – The HVO Systems run on standard household power. A dedicated circuit is required for the Master and a separate dedicated circuit for the Relay Box. We sell 3-outlet (requires 20 amps) and 5-outlet (requires 30 amps) Relay Boxes.

Q – How much does it cost in electricity to run the HVO System?

A – It costs about $0.70 USD in electricity to generate the equivalent of a K-tank (based on Portland, Oregon kw rates). Use our calculator to get an estimate based on your specific requirements.

Q -- How do I calculate the electrical usage of my HVO System in wattage?

A -- Add the number of components in your System (ie, oxygen concentrators, HVO Master and Drones). Multiply that number by 550 for approximate wattage. For example, a 20 Mighty Mite and 3 M10s equals 4 components. 4 x 550 = 2,200 watts. For amperage, multiply each component by 5. In this example, 4 components x 5 amps = 20 amps. When calculating usage, keep in mind that the system runs about 50-60% of the time during the course of a work day. Use our calculator to get an estimate based on your specific requirements.

Q -- What is the payback period on the HVO System?

A -- The precise payback period depends on the cost of oxygen in your region, your usage and the HVO configuration. Use our calculator to get an estimated payback period.

Q -- Over a 3 year period, how much will I save using the HVO System instead of compressed or liquid oxygen?

A -- Depending on your local oxygen costs, small shops can save around $7,000, large shops can save around $70,000. Use our calculator to get a three year Return-On-Investment estimate.

Q -- How long can I run my compressor before it needs maintenance?

A -- If anyone tells you that they have a special compressor in which the piston cups do not wear out, they are not telling the truth. All compressors need to have their piston cups replaced from time to time. The wear on a piston cup happens where the seal meets the tank. Where there is compression, there is friction, heat, and wear. There is no magic that can change this fact -- it’s just physics.

High-powered, two-stage compressors need piston cup replacements every two to three years, depending on usage. Small low-flow, low-pressure compressors need less frequent piston cup replacement. 

The HVO Standard compressor, for example, runs for a long time without the need for maintenance. In the history of HVO, we have replaced very few piston cups for this compressor.  When service is needed, customers will need to spend 20 minutes and roughly $9 to replace a piston cup*. One customer that needed piston cups for an HVO Standard compressor was running 12-hour shifts, 6 days a week for 4 years. They saved more than $100,000 on oxygen since buying the HVO system, so it’s fair to say they were happy to pay a few dollars to fix their compressor.

The Mighty Mite and the MAX have powerful, 2-stage compressors. Not only do they compress to 150 PSI, they maintain roughly the same compression rate throughout the cycle. This means that your concentrators are working at their full flow rate, even when they’re pushing against the back pressure in the tank. The Mighty Mite is a custom 2-stage Thomas compressor. The MAX is a large 2-stage Gast compressor.  

*Unless the system is under warranty, in which case there is no cost.

Q -- I have a question not answered in the FAQ. Whom do I contact?