How long does an E cylinder oxygen tank last?

A full E cylinder holds about 679 liters of medical oxygen, which lasts around 5–6 hours of continuous flow at a setting of 2. Higher settings empty the tank faster, and lower settings make it last longer.If you need more time between refills, ask us about a second tank or a conserving regulator, which releases oxygen only when you breathe in.

Can I refill an oxygen tank I bought somewhere else?

Our $25 refill service is for E cylinders purchased from Complete Medical Supply. If your tank came from another company, give either store a call and we'll go over your options.

What do I need to use an oxygen tank?

Along with the tank, you'll need a regulator to set your flow rate and show how much oxygen is left, a tank key to open the valve, and a nasal cannula or mask. A wheeled tank cart keeps the cylinder upright and makes it easy to move. We stock all of these at both stores.

Should I get an oxygen tank or a home oxygen concentrator?

Many people use both. A home oxygen concentrator plugs into the wall and makes unlimited oxygen at home, while an oxygen tank needs no electricity, which makes it the go-to for trips, appointments and power outages. In Houston, where storms can knock the power out, a tank is a smart backup for any concentrator user.

Oxygen Tanks & Refills in Houston | Complete Medical Supply

e cylinders - 679 liters available

Oxygen Tanks & Refills

When you need a reliable, portable source of medical oxygen — for backup at home, transport to appointments, or use on the go — an E cylinder oxygen tank delivers proven performance in a size you can actually move

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✅ In Stock - Heights Store (18th & Ella Blvd)

✅ In Stock - Cypress Store (290 & Telge Rd)

About Oxygen Tanks

The E cylinder is a mid-size compressed oxygen tank holding approximately 679 liters of medical-grade oxygen at full pressure (around 2,000–2,200 PSI). Our E cylinder oxygen tanks are roughly 35 inches tall and are the standard choice for patients who need portable oxygen for trips, appointments, or as a backup to their home concentrator in case of a power outage.

Unlike a home oxygen concentrator, an E cylinder requires no electricity — making it ideal for travel, emergencies, and situations where a power source isn’t available. Paired with the right regulator and nasal cannula, it delivers a precise, doctor-prescribed flow rate in liters per minute (LPM). At Complete Medical Supply, we carry E cylinders along with the regulators, carts, and accessories you need to use them safely and comfortably.

Key Features

Portable Size

The E cylinder strikes the ideal balance between portability and capacity — holding roughly 679 liters of medical oxygen, enough for around 5-6 hours of continuous flow at a setting of 2

No Electricity

Because E cylinders store compressed oxygen, they work anywhere — no outlet, no power cord, no generator needed. This makes them the go-to backup for home concentrator users during power outages

Precise Flow Rate

With the right regulator attached, an E cylinder delivers oxygen at your exact prescribed flow rate — from 0.5 to 15 LPM depending on the regulator — giving you the same clinical precision as a stationary unit, wherever you are

Quick Refills

Complete Medical Supply offers E cylinder refills for just $25 (must be a tank purchased from us) at our Heights and Cypress locations. Simply bring your empty tank in, and we’ll have you back on oxygen fast. No waiting on delivery, no subscription required

Transporting

Whether you’re heading to a doctor’s visit, a procedure, or simply running errands, an E cylinder travels with you. Most fit securely in a wheeled cart that can be taken in a car, into a clinic, or through a hospital

Most Reliable

E cylinders have been the standard of care in home oxygen and emergency medicine for decades. There are no moving parts, no batteries, no software — just medical-grade oxygen stored under pressure, ready when you need it.

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Related Products & Accessories

Oxygen Tank Regulator

The regulator is the essential valve that connects to your E cylinder and controls the flow of oxygen to your nasal cannula or mask. It displays your current tank pressure so you always know how much oxygen remains, and lets you dial in your exact prescribed flow rate in liters per minute.

Oxygen Tank Key

The tank key is the small wrench used to open and close your E cylinder valve. Most E cylinder valves require this tool to operate, and losing it means you can’t access your oxygen

Oxygen Tank Cart

An E cylinder cart keeps your oxygen tank upright, secure, and easy to move. Instead of carrying a heavy tank or letting it lean against a wall unsecured, a wheeled cart lets you roll it safely from room to room or out to your car without assistance

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Oxygen Tank FAQ's

We refill E cylinder oxygen tanks for $25 at both of our stores: Heights (1732 W. 18th Street, Houston, TX 77008) and Cypress (22224 Northwest Fwy, Suite C, Cypress, TX 77429). We're open Monday–Friday 9am–6pm and Saturday 10am–5pm.Just bring your empty tank in and we'll get you back on oxygen fast, with no delivery wait and no subscription. Our $25 refill is for E cylinders purchased from Complete Medical Supply.