Quick answer: This is the genuine ResMed cleanable (dishwasher-safe) water chamber for the HumidAire H4i heated humidifier (part 26958) — the water tub that sits in the front of the humidifier on ResMed S8-series CPAP/VPAP machines (and Stellar). Unlike the standard hand-wash tub, this cleanable version is built from stainless steel with a silicone seal, so it disassembles for deep cleaning and is dishwasher-safe — more hygienic, longer-lasting, and approved for multi-patient use in clinics and sleep labs. Holds 390 mL. This is the water chamber only — the flip-top lid/seal is not included.
What's included
- 1 × H4i cleanable water chamber (tub, part 26958)
Not included: flip-top lid and seal (part 26953), humidifier, machine.
About this part
The HumidAire H4i is ResMed's heated humidifier for the S8 platform — the water chamber holds the water that's warmed to add moisture to your therapy air, easing dry nose, mouth, and throat. This is the cleanable version of that chamber:
- Dishwasher-safe, disassembles — the tub comes apart for thorough cleaning and can go on the top rack of a dishwasher, making it easy to clear mineral build-up and keep it hygienic.
- Durable materials — injection-moulded plastic with stainless steel and a silicone seal, built to withstand repeated cleaning and disinfection (unlike the standard tub's aluminium/elastomer build).
- Multi-patient approved — because it tolerates repeat disinfection, it's suitable for clinics, hospitals, and sleep labs (as well as long-term home users who want an easier-clean, longer-life tub).
- 390 mL capacity — fill with distilled water to room temperature to reduce mineral and lime build-up; change the water daily.
Cleanable vs standard — choose the right tub:
- 26958 (this) — cleanable / dishwasher-safe, stainless steel + silicone, disassembles, multi-patient, longer-lasting.
- 26952 — standard tub, hand-wash only, replaced about every 6 months, lower cost.
Compatibility
Works with the HumidAire H4i heated humidifier on ResMed S8-series machines (including S8 Escape II with H4i, S8 AutoSet II, and S8 VPAP series), and Stellar. It also fits HumidAire 3i (H3i) humidifiers upgraded with the H4i upgrade kit (if not upgraded, the H3i lid must be replaced with an H4i flip-top lid, 26953, first).
Note: H4i is an older-generation humidifier. The current AirSense 10 / AirSense 11 machines use different water chambers — this tub is not for those.
Key features
- Genuine ResMed H4i cleanable water chamber (26958) — dishwasher-safe.
- Disassembles for deep cleaning — stainless steel + silicone seal.
- Longer-lasting, more hygienic than the standard hand-wash tub.
- Multi-patient approved — clinics, hospitals, sleep labs.
- 390 mL — use distilled water; change daily.
- For H4i on ResMed S8-series — tub only (lid 26953 separate).
Specifications
| Specification | Detail |
| Product type | Heated-humidifier water chamber (cleanable / dishwasher-safe) |
| For humidifier | ResMed HumidAire H4i |
| Compatible machines | ResMed S8 series (CPAP/VPAP), Stellar; H3i with H4i upgrade |
| Capacity | 390 mL |
| Materials | Injection-moulded plastic, stainless steel, silicone seal |
| Cleaning | Disassembles; dishwasher-safe; withstands repeat disinfection |
| Use | Multi-patient approved; use distilled water; change daily |
| Included | Water chamber (tub) only |
| Not included | Flip-top lid + seal (26953), humidifier, machine |
| Versions | 26958 cleanable (this) · 26952 standard (hand-wash) |
| HCPCS | A7046 |
| GTIN | 00619498269587 |
| Prescription | Not required |
| ResMed reference / SKU | 26958 |
| Brand | ResMed |
Frequently asked questions
What's included? The cleanable water chamber (tub) only. The flip-top lid and seal (26953), the humidifier, and the machine are separate.
How is it different from the standard chamber (26952)? This cleanable version disassembles and is dishwasher-safe (stainless steel + silicone), lasts longer, and is multi-patient approved. The standard tub (26952) is hand-wash only, lower cost, and typically replaced about every 6 months.
Which machines does it work with? The HumidAire H4i humidifier on ResMed S8-series machines (and Stellar), plus H3i humidifiers upgraded with the H4i upgrade kit. It's not for AirSense 10/11.
What water should I use? Distilled water at room temperature, to reduce mineral/lime build-up. Change the water daily.
Is it dishwasher-safe? Yes — it disassembles and can be washed on the top rack of a dishwasher.
Do I need a prescription? No — this replacement part does 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 H4i humidifier and S8-series device according to the H4i user guide. Use distilled water and empty the chamber before transport.