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ResMed S9 CPAP water tank replacement
ResMed AirSense S9 Water Tank thumbnail
ResMed AirSense S9 Water Tank thumbnail
ResMed S9 CPAP water tank replacement

ResMed AirSense S9 Water Tank

4.8 (43 reviews)
ResMed | SKU: 36800
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$39 0
4 interest-free payments or as low as with Affirm. Learn more
Free Shipping Over $100 Price Match Guarantee 60-Night Risk Free 2 Year Warranty Unlimited Support HSA/FSA Approved

    Why Choose cpapRX?

  • Expert sleep apnea care from trusted specialists
  • Easy CPAP prescription renewal online
  • Fast shipping and dependable service
  • Price match guarantee on eligible products
  • Helpful support, education, and therapy guidance
ResMed AirSense S9 Water Tank
  • Increases therapy comfort and helps prevent dry mouth and congestion
  • Dishwasher safe for easier, more hygienic cleaning, can also be hand washed
  • Compatible with the H5i humidifier built into all ResMed S9 machine
  • Recommended to clean daily
  • Recommended to replace every 6 months
  TIP: How to Clean Your Water Chamber: Daily Cleaning:
  1. Unplug your machine from the power source
  2. Disconnect the humidifier tub from the machine
  3. In a sink or tub, rinse the humidifier tub with mild soap and warm, drinking-quality water
    1. Avoid using stronger cleaning products, including dish detergents, as they may damage the humidifier tub or leave harmful residue
  4. Rinse again thoroughly with warm, drinking-quality water
  5. Place the humidifier tub on a flat surface, on top of a towel, to dry
    1. Avoid placing in direct sunlight!
  6. The humidifier tub should always be clean, clear, and free of discoloration
Weekly Cleaning:
  1. Once per week, soak your humidifier tub in a solution of 1 part white vinegar and 1 part water for 15-20 minutes
  2. After soaking, rinse thoroughly with warm, drinking-quality water
  3. Place the humidifier tub on a flat surface, on top of a towel, to dry
    1. Avoid placing in direct sunlight!

H5i™ Cleanable Tub

Weight 8.64 oz
Dimensions 5.75 × 5.375 × 3 in

H5i™ standard Tub

Weight 5.12 oz
Dimensions 5 × 5 × 3 in

·  Reduces dry mouth and congestion — adds moisture to your CPAP airflow for more comfortable overnight therapy

·  Dishwasher safe — also hand-washable, making daily cleaning quick and hygienic

·  Compatible with the H5i humidifier built into all ResMed S9 machines

·  Two tub options available — H5i Cleanable Tub or H5i Standard Tub, depending on your cleaning preference

·  Recommended replacement every 6 months — keeps humidification performing as intended and reduces bacteria buildup

No replacement parts or accessories are linked for this product.

Expert Tips & How‑To Videos

Short, focused videos from sleep and equipment experts to help you get the most out of this product.

No expert tips available for this product.

Check back later or browse our guides for helpful tips.

Frequently Asked Questions

Clear answers to common questions about this product, therapy, and ordering so you can feel confident before you buy.

Unplug your machine, disconnect the tub from the machine, and rinse it in a sink with mild soap and warm water. It's dishwasher safe for a deeper clean, but daily hand-rinsing is recommended to keep it hygienic.
ResMed recommends replacing the water tank every 6 months. A worn tank can crack, discolor, or hold bacteria even if it looks fine on the surface.
Condensation ("rainout") happens when humidified air cools as it travels through the tube, especially in colder rooms. Using a heated tube or adjusting your humidity level can help reduce it — the water tank itself isn't the cause.
Yes, this tank is compatible with the H5i humidifier built into all ResMed S9 machines. Choose between the H5i Cleanable Tub or H5i Standard Tub based on your cleaning routine preference.
Leaks are most often caused by a cracked or worn tank, an improperly seated seal, or overfilling past the max fill line. If your tank is more than 6 months old, replacing it is usually the fastest fix.
4.8
Based on 43 reviews
5 stars
34
4 stars
9
3 stars
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HE
henry-woods
2 years ago ✓ Verified Purchase

Cpap Mask Ordered

The CPAP mask I ordered from CPAPRX is comfortable and easy to use. I wake up feeling refreshed and energetic every morning.

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BA
bari-brown
1 year ago ✓ Verified Purchase

Long Time Cpap

As a long-time CPAP user, I can confidently say CPAPRX provides reliable products and outstanding customer service. They truly care about patients.

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RU
ruth-friton
1 year ago ✓ Verified Purchase

Cpaprx Made Entire

CPAPRX made the entire process smooth and stress-free. The product quality is excellent and delivery was quick. Highly recommended for anyone struggling with sleep apnea.

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ER
eriktasker
2 years ago ✓ Verified Purchase

Have Been Using

I have been using my CPAP machine from CPAPRX for months now and the improvement in my sleep quality is incredible. The mask fits perfectly and the support team was very helpful.

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JU
judy-wagner
2 years ago ✓ Verified Purchase

Excellent Experience With

Excellent experience with CPAPRX. From ordering to delivery, everything was seamless. Their team guided me well in choosing the right equipment.

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MI
michael-chapman
1 year ago ✓ Verified Purchase

Cpap Mask Ordered

The CPAP mask I ordered from CPAPRX is comfortable and easy to use. I wake up feeling refreshed and energetic every morning.

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CW
cwcarter
1 year ago ✓ Verified Purchase

Long Time Cpap

As a long-time CPAP user, I can confidently say CPAPRX provides reliable products and outstanding customer service. They truly care about patients.

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SC
schlangery
3 years ago ✓ Verified Purchase

Cpaprx Made Entire

CPAPRX made the entire process smooth and stress-free. The product quality is excellent and delivery was quick. Highly recommended for anyone struggling with sleep apnea.

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CH
chudsonvoayahoo-com
3 years ago ✓ Verified Purchase

Have Been Using

I have been using my CPAP machine from CPAPRX for months now and the improvement in my sleep quality is incredible. The mask fits perfectly and the support team was very helpful.

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SE
selvvino2
2 years ago ✓ Verified Purchase

Excellent Experience With

Excellent experience with CPAPRX. From ordering to delivery, everything was seamless. Their team guided me well in choosing the right equipment.

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