Price (USD)
Close callHydrology9 NX
$250
PAX FOUR
$250
Pricing is very close between both devices.
Vaporizer Comparison
Hydrology9 NX vs PAX FOUR
Side-by-side specs, pricing context, and clear decision guidance.
Hydrology9 NX
Cloudious9 $250
VS
PAX FOUR
PAX Labs $250
Editorial Summary
Hydrology9 NX and PAX FOUR are both hybrid / electronic vaporizers, but they target different priorities. Their listed prices are close ($250 vs $250). Hydrology9 NX has the quicker listed heat-up profile, which can matter for shorter sessions.
Specs Compared
23
Different Specs
21
Shared Specs
2
Overall Overlap
9%
Shared Traits
Hybrid Electronic
Head-to-Head Highlights
A quick snapshot of the specs people usually care about first.
Heat-Up Time
Hydrology9 NX edgeHydrology9 NX
~30 seconds
PAX FOUR
55-70 seconds
Hydrology9 NX has the quicker listed heat-up profile.
Weight
PAX FOUR edgeHydrology9 NX
413 grams
PAX FOUR
125 grams
PAX FOUR is the lighter listed unit.
Heating Style
Close callHydrology9 NX
Hybrid Convection
PAX FOUR
Hybrid (conduction and convection)
Heating style differs, which can impact flavor and extraction behavior.
Key Differences at a Glance
Top specs where these two devices diverge.
Device Type
Hydrology9 NX
Desktop
PAX FOUR
Portable
Heating Type
Hydrology9 NX
Hybrid Convection
PAX FOUR
Hybrid (conduction and convection)
Heat Up Time
Hydrology9 NX
~30 seconds
PAX FOUR
55-70 seconds
Temperature Range
Hydrology9 NX
356°F - 455°F (herb), 554°F - 770°F (extract)
PAX FOUR
190-220°C (374-428°F)
Chamber Capacity
Hydrology9 NX
~0.2g - 0.25g
PAX FOUR
~0.3g
Battery Type
Hydrology9 NX
Removable
PAX FOUR
Internal lithium-ion
Battery Capacity
Hydrology9 NX
1900mAh
PAX FOUR
2800mAh
Battery Life
Hydrology9 NX
60-120 sessions
PAX FOUR
Up to 5 sessions, about 50 minutes of run time
Charging
Hydrology9 NX
USB to Propietary Magnetic Connector
PAX FOUR
USB-C
Charge Time
Hydrology9 NX
~60 minutes
PAX FOUR
~90 minutes
Choose Hydrology9 NX if...
- You care about faster heat-up time for quicker sessions.
- You prefer a hybrid convection heating profile.
- Your usage leans toward convection and desktop sessions.
Typical price
$250
Sold by To the Cloud Vapor Store
Choose PAX FOUR if...
- You want the lighter unit for carrying and travel.
- You prefer a hybrid (conduction and convection) heating profile.
- Your usage leans toward portable and discrete sessions.
Typical price
$250
Sold by The Stash Shack
Prices are read automatically from retailer pages; confirm the price at checkout. Some links are affiliate links, which support Thermal Extractions at no extra cost to you.
Spec Comparison Table
Direct comparison of every spec from each device profile.
21 differ 2 shared
| Specification | Hydrology9 NX | PAX FOUR |
|---|---|---|
| Price (USD) | $250 | $250 |
| Device Type | Desktop | Portable |
| Heating Type | Hybrid Convection | Hybrid (conduction and convection) |
| Heat Up Time | ~30 seconds | 55-70 seconds |
| Temperature Range | 356°F - 455°F (herb), 554°F - 770°F (extract) | 190-220°C (374-428°F) |
| Chamber Capacity | ~0.2g - 0.25g | ~0.3g |
| Battery Type | Removable | Internal lithium-ion |
| Battery Capacity | 1900mAh | 2800mAh |
| Battery Life | 60-120 sessions | Up to 5 sessions, about 50 minutes of run time |
| Charging | USB to Propietary Magnetic Connector | USB-C |
| Charge Time | ~60 minutes | ~90 minutes |
| Dimensions | 4.5cm x 4.5cm x 17.5cm | 108 x 36 x 29mm |
| Weight | 413 grams | 125 grams |
| Power Adjustment | 6 Presets (Dial) | Four preset heat modes (purple, green, yellow, orange) |
| Chamber Material | Ceramic (herb) / Quartz & Ceramic (extract) | Stainless steel |
| Concentrate Support | Yes | No (not compatible with the PAX Concentrate Insert) |
| Brand | Cloudious9 | PAX Labs |
| Adjustable Airflow | — | No (flat and raised mouthpieces change the draw) |
| Display Type | — | LED petals |
| Manufacturer | — | PAX Labs, Inc (model X410) |
| Release Date | 2021 | 2026 |
| Session Style | Session | Session |
| Warranty | 2 years | 2 years, plus 1 year when registered within 30 days |
Comparison FAQs
What is the biggest difference between the Hydrology9 NX and the PAX FOUR?
The biggest practical difference is form factor: these aren't the same kind of device. Hydrology9 NX is a desktop, PAX FOUR is a portable. Pick based on whether you want something portable or something stationary.
Which heats up faster, the Hydrology9 NX or the PAX FOUR?
Hydrology9 NX reaches session-ready temperature in ~30 seconds, while the PAX FOUR takes 55-70 seconds. That's roughly 33 seconds quicker on the Hydrology9 NX, which is useful if you want shorter, on-demand sessions.
What's the difference in heating between the Hydrology9 NX and the PAX FOUR?
Hydrology9 NX uses hybrid convection heating, while the PAX FOUR uses hybrid (conduction and convection). Heating style influences flavor profile, vapor density, and how forgiving the device is to draw technique.
Does the Hydrology9 NX or the PAX FOUR hold more flower?
PAX FOUR has the larger chamber at ~0.3g, versus ~0.2g - 0.25g on the Hydrology9 NX. A bigger bowl means fewer reloads on long sessions; a smaller one suits microdosing and quicker bowls.
Which is lighter, the Hydrology9 NX or the PAX FOUR?
PAX FOUR is the lighter unit at 125 grams, around 288g less than the Hydrology9 NX at 413 grams. The lighter device is easier to carry and pocket day-to-day.
Is the Hydrology9 NX or the PAX FOUR better for home versus on-the-go use?
PAX FOUR is the take-anywhere choice. It's a portable, battery-powered unit, while the Hydrology9 NX is built for home use, where bigger heaters, AC power, and larger chambers make sense.
Which is cheaper, the Hydrology9 NX or the PAX FOUR?
Listed prices are close: $250 for the Hydrology9 NX versus $250 for the PAX FOUR. Day-to-day price will likely come down to whichever retailer is running a promotion.
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