General Questions

Q -- Is financing available?

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

Q – Are the parts in the HVO System oxygen-rated?

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

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).


The main differences between the HVO proprietary tanks and commercial tanks are 1) HVO tanks are available in larger sizes, 2) HVO tanks go through a special process to ensure that they are OXYGEN CLEAN***, and 3) HVO tanks are powder-coated in our classic HVO green.

***WARNING: If you bought a used tank, beware that the presence of hydrocarbons such as oil or propane can cause your tank to EXPLODE when filled with oxygen.

Keep in mind that the HVO System begins refilling the tank when the pressure goes below 30 PSI for the Standard and below 100 PSI for the Mighty Mite and MAX. The charts above show how much oxygen is available when the tank is at full pressure.

Q – Is there a warranty?

A – Full HVO Systems come with a 3-year warranty. New Respironics oxycons purchased through HVO are also covered by a 3-year warranty. The HVO 2-Go and AirSeps are covered by one year warranties.

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 and electricity 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 -- All compressors need to be serviced from time to time. Wear is inevitable due to compression, which causes friction and heat.

High-powered, two-stage compressors may need to be serviced every two to three years, depending on usage. Small low-flow, low-pressure compressors need less frequent service. 

The HVO Standard compressor, for example, runs for a long time without the need for maintenance. When service is needed, customers will need to spend less than an hour and roughly $9 to replace a piston cup*. One customer ran an HVO Standard compressor for 4 years before they required service. In that time they saved more than $100,000 on oxygen, 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 – Will the HVO System operate in a location that is not air-conditioned or heated?

A – Our oxygen compression systems should be operated in an environment that maintains the temperature between 45 F (7.2 C) to 90 F (32.2 C), and the humidity at less than 50%. Plan to have good air-flow in the space where your system is located, which can be accomplished with fans and/or AC.

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