Humidifier and device not included.
The H5i heated humidifier warms water in the tub so the air delivered through your tubing carries moisture — which helps prevent the dry mouth, dry nose, and nasal irritation that unhumidified therapy can cause.
ResMed offers the H5i tub in two versions, and the difference is how you maintain them. This standard tub is a sealed unit: simple, no parts to disassemble, and replaced on a schedule rather than deep-cleaned. The cleanable tub (36800) opens up so every internal surface can be washed and reused over a longer period.
Which is better depends on your preference: standard is lower effort per day and lower cost per unit; cleanable costs more up front but is replaced less often.
| Specification | Detail |
|---|---|
| Product type | Humidifier water tub (standard) |
| Compatible humidifier | ResMed H5i (S9 series platform) |
| Version | Standard (disposable) |
| Included | Water tub only |
| Related parts | Cleanable tub (36800) · Flip lid (36891) · Lid seal (36892) · Outlet clip & fitting (36894) |
| ResMed reference / SKU | 36803 |
| Brand | ResMed |
Empty the tub daily and refill with fresh distilled water before each use — distilled water greatly reduces mineral scale and extends the tub's life. Clean it per the H5i user guide and let it dry completely before reassembly. Replace the tub when it becomes cloudy, heavily scaled, cracked, or no longer seals properly — commonly around every 6 months with regular use, or sooner as needed.
Both fit the same H5i humidifier — it's purely a maintenance preference.
What does the water tub do? It holds the water the humidifier heats, adding moisture to the air delivered through your tubing.
Which humidifier does it fit? The ResMed H5i heated humidifier, used with the S9 series.
What's the difference between 36803 and 36800? 36803 is the standard sealed (disposable) tub; 36800 is the cleanable version designed to be opened, washed, and reused.
What water should I use? Distilled water is recommended — it reduces mineral buildup and helps the tub last longer.
How often should it be replaced? Commonly around every 6 months with regular use, or sooner if it's cloudy, scaled, cracked, or leaking.
Do I need a prescription? No — replacement humidifier parts do not require a prescription.
Can I get it delivered in Brooklyn or shipped nationwide? Yes — Task Supply Corp offers USPS shipping throughout the continental U.S., plus local pickup and delivery in Brooklyn and all five boroughs of New York City.
Use with a compatible ResMed H5i humidifier according to the device's user guide. Use only water as directed by the manufacturer.