ResMed S9 90W Power Supply Unit (with Power Cord)

Quick answer: This is the genuine ResMed 90W power supply unit for the S9 series CPAP/BiLevel machines (part 36821) — the power cord is included. This is the standard S9 power supply, supplied with every S9 system: it powers the machine and the H5i heated humidifier and heated tubing together. If you use a humidifier or heated tube, this is the PSU you need (the 30W version is for the machine only). Universal 100–240V for worldwide travel (a plug adapter may be needed outside North America). Includes the 90W brick + North American AC wall cord. No prescription required.

What’s included

• 1 × ResMed S9 90W power supply unit (brick)
• 1 × North American (US/Canada) AC power cord

Machine not included.

About this part

ResMed’s S9 machines run on an external PSU, and there are two versions — this 90W (standard, powers machine and humidifier) and an optional 30W (machine only). This is the full-power option:

• Powers the machine + H5i humidifier + heated tubing — the 90W output meets the higher power demand of the heated humidifier and ClimateLine heated tube, for stable performance.
• Standard equipment — this is the PSU originally supplied with all S9 CPAP/AutoSet/VPAP systems; the correct full replacement.
• Cord included — comes with the North American AC wall cord (plugs into a 110V outlet).
• Universal voltage (100–240V, 50–60Hz) — travel worldwide; you only need a simple physical plug adapter outside the US/Canada (no voltage converter).
• AC only — plugs into a wall socket; not for DC use (a separate DC converter handles 12/24V).

Important — 90W (with humidifier) vs 30W (machine only)

• 90W (36821, this) — powers the S9 machine and the H5i humidifier/heated tubing. Use this if you have a humidifier or heated tube.
• 30W (36920) — powers the machine only; lighter for travel, but it does not support the humidifier or heated tubing (and shouldn’t be used to power them).

Compatibility

Powers all ResMed S9-series machines — S9 Escape, Elite, AutoSet, VPAP/VPAP Auto, ASV — with or without the H5i humidifier. Designed to work ONLY with the S9 series — don’t use it on other machines/components (it won’t work or could cause damage). The S8, AirSense/AirCurve 10, and 11 use different power supplies.

Key features

• Genuine ResMed S9 90W PSU + power cord (36821).
• Powers machine + H5i humidifier + heated tubing — full power.
• Standard S9 PSU — cord included.
• Universal 100–240V — travel-ready (plug adapter outside US/Canada).
• All S9 CPAP/VPAP machines — S9 only; not S8/Air10/11.

Specifications

Frequently asked questions

Is the power cord included?
Yes — this includes the 90W power supply brick and the North American AC wall cord.

Do I need the 90W or the 30W?
Use the 90W (36821) if you have the H5i humidifier or heated tubing — it powers the machine and humidifier together. The 30W (36920) is machine-only (lighter for travel, no humidifier support).

Which machines does it power?
All ResMed S9-series machines (S9 Escape, Elite, AutoSet, VPAP, ASV), with or without the humidifier. It’s for the S9 only.

Can I use it internationally?
Yes — it’s universal (100–240V). Outside the US/Canada you just need a simple plug adapter (no voltage converter).

Will it power my S8 or AirSense 10?
No — this is for the S9 series only. Other generations use different power supplies.

Do I need a prescription?
No — a power supply does not require a prescription.

Can I get it delivered in Brooklyn or shipped nationwide?
Yes — Stark Medical Supplies offers local pickup and delivery in Brooklyn and across NYC, plus USPS shipping throughout the continental U.S.

Use only the correct ResMed power supply for your S9 setup. The 90W supports the humidifier; follow the S9 user guide.