Home oxygen is billed as 3 separate things and quoted as one number, which is why the first invoice surprises people. The split is the oxygen source, the delivery hardware, and the monitoring and power. A 5 liter per minute concentrator rental runs about USD 150 to 400 a month in the US, GBP 120 to 320 in the UK, and CNY 400 to 1,200 in China, and every line moves 1.5 to 3 times with city and hospital tier.
Concentration, not flow, is the number that decides what you rent. Room air is 20.9 percent oxygen. A chamber that reaches 35 to 40 percent does a different job from a cylinder feeding a nasal cannula at 25 to 30 percent, and the price difference between those two setups is 2 to 4 times.
Part 1: the oxygen source
Three sources are sold for home use. A compressed cylinder is a deposit plus a refill: an E-size cylinder holds about 680 liters, an M-size about 3,000 liters, and a regulator with a flowmeter comes with the rental. A concentrator pulls oxygen from room air and delivers 90 to 96 percent at its rated flow, usually 5 liters per minute for a home unit and 10 for a larger one; it needs 300 to 600 watts and runs at 40 to 55 decibels. Liquid oxygen holds the most per liter but vents continuously, so it suits weekly delivery, not a 3-month rental.
The cylinder math is worth doing before you sign. At 2 liters per minute, a 680 liter cylinder lasts about 340 minutes, or 5.6 hours, so a cat that needs overnight support burns 2 cylinders a night. A concentrator at the same setting never runs out, which is why the rental replaces cylinder refills for anything longer than 3 to 4 days.
Part 2: the delivery hardware
What sits between the source and the cat changes both the concentration and the bill. A nasal cannula or a mask is the cheapest option and the least precise: at 1 to 2 liters per minute a cat inspires roughly 25 to 35 percent, depending on how much it mouth-breathes and how well the tubing sits. An oxygen chamber or cage is the usual home choice, reaches 30 to 50 percent at 3 to 5 liters per minute, and needs 2 to 3 minutes to flush before the cat goes in. A tight-fitting hood or box with 5 liters per minute can hold 40 to 60 percent, but heat and humidity build up inside within 20 to 30 minutes.
Small parts add up: 2 to 7 meters of tubing, a humidifier bottle, a spare cannula, and a flowmeter that reads in 0.5 liter steps rather than 1 liter steps. Ask for the 0.5 step meter; a 1 liter jump is a 50 to 100 percent change at the low end of the range. If the cat is coming home after 2 to 4 days in a hospital cage, compare the rental with a hospital oxygen day.
Part 3: monitoring and power
A pulse oximeter reads 70 to 100 percent with an accuracy of plus or minus 2 to 3 points on a cat's ear or tongue, and costs less than 1 week of concentrator rental. A battery backup for a 5 liter unit runs 2 to 8 hours depending on the model, and a 12 volt car adapter covers the drive to the clinic. Electricity is small but real: 450 watts for 8 hours a day is about 3.6 kilowatt hours, which is 1 to 2 units of currency per day in most cities.
What each part costs
| Line item | Specification | US (USD) | UK (GBP) | China (CNY) |
|---|---|---|---|---|
| Concentrator rental, per month | 5 L/min, 90 to 96 percent | 150 to 400 | 120 to 320 | 400 to 1,200 |
| Concentrator purchase | 5 L/min, 300 to 600 W | 900 to 2,200 | 700 to 1,800 | 2,500 to 7,000 |
| Cylinder deposit | E or M size, refundable | 80 to 200 | 60 to 180 | 200 to 600 |
| Cylinder refill, per swap | 680 to 3,000 liters | 25 to 60 | 20 to 50 | 60 to 150 |
| Oxygen chamber or cage | 30 to 50 percent at 3 to 5 L/min | 120 to 400 | 100 to 330 | 300 to 1,000 |
| Pulse oximeter | plus or minus 2 to 3 points | 25 to 90 | 20 to 75 | 60 to 200 |
| Tubing, cannula, humidifier | 2 to 7 m, spare set | 8 to 30 | 7 to 25 | 15 to 60 |
Each figure is a range because the same 5 liter unit rents for 1.5 to 3 times more in a capital city than in a smaller one, and delivery, setup and a 24-hour service line are often billed separately at USD 40 to 90, GBP 30 to 70, or CNY 50 to 150. Add the figures up in the cost calculator before the first delivery, not after the first invoice.
Concentration versus flow: the number that matters
Two devices rated at 5 liters per minute can deliver different oxygen fractions, because the fraction depends on the chamber volume and the leak rate. A 15 liter chamber with 5 liters per minute of flow reaches about 40 percent in 2 to 3 minutes; the same flow into a 60 liter cage reaches 30 to 33 percent. If the chamber door is opened every 5 minutes, the number falls back toward 21 percent each time and takes 2 minutes to recover.
Read the dial against a fixed reference: 21 percent is room air, 100 percent is what leaves the concentrator outlet, and what the cat inspires sits somewhere between. A meter that shows 5 liters per minute says nothing about the percentage at the nose.
What changes the invoice
Five things: body weight above 5 kg, which pushes a chamber to a larger volume; a second unit for a second room; weekend or same-day delivery, usually plus 20 to 40 percent; a service contract that includes filter changes every 2 to 4 weeks; and cylinder swaps, which cost 4 to 6 times more per hour of oxygen than a concentrator at the same flow.
Setting up without turning the room into a hazard
Keep the cylinder upright and chained within 1 meter of a wall, 2 meters from any heat source, and never in a car trunk that reaches above 50 degrees Celsius. No oil, grease, or alcohol spray on the regulator threads. Run tubing along the wall, not across the floor, and keep 1 meter of slack at the chamber so the cat cannot pull the unit over; if the same cat also goes home on fluids given at home, reserve a second shelf and a second socket. Ventilate the room for 10 minutes every 2 to 3 hours; a sealed room at 30 degrees with a running concentrator gets hot and humid fast.
Five steps before the first delivery
- Confirm the written order from your veterinarian, the flow setting, and the target concentration for each device.
- Measure the room: 10 to 15 cm clearance for a concentrator, 1 meter for a cylinder, and a socket on its own circuit.
- Ask whether the monthly price includes delivery, setup, filters, and a 24-hour replacement unit.
- Buy the oximeter before the oxygen, so you can record a baseline of 95 to 100 percent on room air.
- Keep a 4-hour battery option and a spare cylinder for power cuts; a 5 liter unit draws too much for a small UPS.
Total for a basic 30-day setup lands around USD 250 to 700, GBP 200 to 570, or CNY 700 to 2,100, with a concentrator rental as the largest single line.
Frequently asked
Do I need a concentrator or is a cylinder enough?
Match the device to the hours, not the diagnosis: a 680 liter cylinder gives about 5.6 hours at 2 liters per minute, so 2 to 3 nights a week is 4 to 6 cylinders. A concentrator rental usually costs less than 8 refills and removes the swap trips.
How do I know the chamber is at the right concentration?
Time the flush and check with a meter at the cat's nose, not the outlet. A 15 liter chamber at 5 liters per minute takes 2 to 3 minutes to reach about 40 percent, and drops toward 21 percent every time the door opens.
What does the monthly rental usually exclude?
Delivery, setup, filter changes every 2 to 4 weeks, a backup unit during repairs, and after-hours callouts. Those add roughly 10 to 25 percent to the headline rental in most cities, and more where delivery is a 60 minute drive.