PAX FOUR Review: Our Verdict on the PAX 4 Dry Herb Vaporiser

Last updated: 15 October 2026

Our PAX FOUR review in short: the PAX FOUR vaporiser (also searched for as the PAX 4) is a dry herb only device with good flavour and vapour, four heat modes on one button, an easier-to-load oven and USB-C charging. PAX says its hybrid heater produces up to 50% more vapour than earlier PAX devices. The weaknesses we noticed are its size, as it is noticeably larger than previous PAX models, and the lack of concentrate support. At £177.60 Original price was: £177.60.£160.00Current price is: £160.00. it is our pick for flavour, while the PAX FLOW is the better buy if faster charging matters more.

Key Takeaways

• The PAX 4 and the PAX FOUR are the same device: PAX's fourth-generation dry herb vaporiser.
• Hybrid conduction and convection heater; PAX claims up to 50% more vapour than earlier PAX models, including the FLOW.
• Four colour-coded heat modes on one button, which we found straightforward.
• Up to 50 minutes (around 5 sessions) per charge, per PAX, and USB-C charging in about 90 minutes.
• Dry herb only: no concentrates, liquids or PAX Concentrate Insert.
• Noticeably larger than older PAX models in testing; the PAX FLOW charges in under 40 minutes.

PAX FOUR vs PAX FLOW at a Glance

Both picks use PAX's hybrid conduction and convection heater, so the choice comes down to heat modes, charging speed and oven design.

Product	Best for	Key spec
PAX FOUR	Flavour-focused users who want simple controls	Hybrid heater, 4 heat modes, USB-C charge in about 90 min, dry herb only
PAX FLOW	Buyers wanting quick charging and a stronger draw	Hybrid heater, 5 heat modes incl. Bong Mode, USB-C charge in under 40 min, oven up to 0.40 g

How We Chose

Easy Vapes is a UK retailer stocking both devices alongside the wider PAX range, other vapes and vape accessories, so we only compare products we sell. First-hand observations come from our tester's notes on the PAX FOUR; specifications come from PAX's published material, with PAX's own claims labelled. PAX's two headline claims, up to 50% more vapour for the FOUR and up to six times the draw strength for the FLOW, measure different things, so we do not rank them against each other.

PAX FOUR Review: Best All-Round PAX for Flavour

The PAX 4 dry herb vaporiser is our pick for flavour. We found good flavour and vapour production, and some owners report noticeably better flavour and thicker vapour than with earlier PAX models. PAX credits a high-output hybrid heater blending conduction and convection, and claims up to 50% more vapour than the PAX 2, PAX 3, PAX PLUS, PAX MINI and PAX FLOW.

The aluminium body has a refined magnetic lid that PAX says increases airflow through the all-new oven. PAX describes the FOUR as continuing its lightweight silhouette, but in testing it was noticeably larger than previous PAX models, which matters if you carry it in a pocket.

PAX FOUR Full Specifications

Spec	PAX FOUR
Model	X400
Heater	High-output hybrid (conduction and convection)
Heat modes	4 presets, patented temperature control, automatic high-temperature shut-off
Maximum oven temperature	Up to 230°C during and after use
Heat-up time	About 55-70 seconds
Battery	2800 mAh, not user-replaceable; up to 50 minutes or around 5 sessions
Charging	USB-C, 0-100% in about 90 minutes; charge between 0°C and 45°C
Material	Dry herb only; not compatible with PAX Concentrate Insert
Body	Aluminium with magnetic oven lid
Warranty	2 years limited, plus 1 year if registered within 30 days
Colours	Onyx, Greenstone, Oxblood (we stock Onyx and Greenstone)
In the box	Device, Multi-Tool, 3 oven screens, wire brush, flat and raised mouthpieces, USB-C cable

The Four Heat Modes and Temperatures

Control is one button: with the mouthpiece fitted, hold it for 2 seconds to power on, and pink LED petals show heat-up has started. PAX's Quick Start Guide says the petals turn green when ready, roughly 55-70 seconds later, and a quick press cycles the four modes, confirmed by waiting 3 seconds or shaking the device. We found this one-button system straightforward.

The temperatures below are our tester's approximate readings, not PAX figures; PAX lists only each mode's colour and purpose.

Mode colour	PAX's stated purpose	Approx temperature (our tester, not PAX)
Purple (petal 1)	Minimal vapour, discreet sessions	About 190°C
Green (petal 2)	Extends sessions, conserves material	About 200°C
Yellow (petal 3)	Enhances flavour, smooth vapour	About 210°C
Orange (petal 4)	Maximises vapour production, dense clouds	About 220°C

We found the best flavour on yellow, while the lower modes gave much more discretion. PAX says lower settings bring out more flavour and higher ones increase vapour and intensity, so yellow makes a sensible middle ground.

Battery Life and USB-C Charging

PAX rates the FOUR at up to 50 minutes, or around five sessions, per charge, and its battery and charging page notes this varies with heat mode and use. A 0-100% charge takes about 90 minutes over USB-C, replacing the proprietary magnetic charger of the PAX 3 and PAX PLUS. The 2800 mAh battery is not user-replaceable, and PAX says to charge only between 0°C and 45°C, so our vape battery safety habits apply here too.

One caveat: our tester felt the FOUR needed recharging slightly more often than their PAX 3, though this could be down to the charger used. If charging seems slow, check our UK charger guide before blaming the battery. Shake the device while it is on to see the level: each lit petal is 25%, and one red petal means empty.

Loading and Cleaning

PAX says the oven was redesigned for easier loading and cleaning, and in testing the funnel-shaped opening did make loading easier. PAX advises grinding medium-fine, which is where one of our grinders helps, then packing level with the top of the oven at medium density using the supplied Multi-Tool.

Let it cool for 10 minutes before handling, emptying or cleaning, as the oven can reach 230°C. PAX recommends cleaning every 3-5 sessions: run the wire brush with isopropyl alcohol through the vapour path and soak the oven screen for 15 minutes. If it overheats, the petals alternate red and orange four times and it shuts down until cool, and holding the button for 7 seconds performs a factory reset.

PAX FOUR Pros and Cons

Pros

• Good flavour and vapour production in our testing
• Four colour-coded heat modes on one button make it simple to use
• Funnel-shaped oven opening makes loading easier
• USB-C charging replaces the old proprietary PAX charger
• 2-year limited warranty, plus 1 extra year when registered within 30 days of purchase

Cons

• Noticeably larger than previous PAX models
• Our tester recharged it slightly more often than a PAX 3, possibly charger-related
• Dry herb only, with no concentrate compatibility
• 2800 mAh battery is not user-replaceable
• About 90 minutes to charge, against under 40 minutes for the PAX FLOW

View product £177.60 Original price was: £177.60.£160.00Current price is: £160.00.

PAX FOUR vs PAX 3: Worth Upgrading?

Feature	PAX FOUR	PAX 3
Vapour (PAX claim)	Up to 50% more than PAX 3	Baseline
Charging	USB-C, about 90 minutes	Proprietary magnetic charger
Oven	Funnel-shaped opening, easier to load in our testing; PAX gives packing guidance only	About 0.35–0.5 g (PAX)
Size	Noticeably larger (our tester)	Smaller
Recharging	Slightly more often in our testing, possibly charger-related	Less often for our tester

Our view: upgrade if flavour and USB-C charging matter more than pocket size, since the 50% vapour claim and the easier oven are the main gains. Stay with your PAX 3 if a smaller device suits you better.

Who Is the PAX FOUR For?

• Flavour-focused users: yes. We found the best flavour on yellow, the mode PAX says enhances flavour.
• Beginners: yes. One button, four colour-coded modes and ready in about 55-70 seconds.
• Concentrate users: no. It is dry herb only; the PAX PLUS supports concentrates with its Complete Kit insert.
• Pocket carry: probably not. It is noticeably larger than earlier PAX models; the PAX Mini 2 is the compact choice.
• PAX 3 owners: usually. Worth it for flavour and USB-C, less so if size matters.
• Fast charging first: no. The PAX FLOW charges in under 40 minutes.

For PAX 3 owners, the upgrade case rests on flavour, loading and charging. Some owners report noticeably better flavour and thicker vapour than with earlier PAX models, PAX claims up to 50% more vapour than the PAX 3, and USB-C replaces the proprietary magnetic charger. Against that, our tester found the FOUR noticeably larger and felt it needed recharging slightly more often, possibly because of the charger.

PAX FLOW: Better for Fast Charging and a Stronger Draw

The PAX FLOW is the better choice if charging speed matters: PAX says it charges fully via USB-C in under 40 minutes, against about 90 minutes for the FOUR. It also uses a hybrid heater, but adds a fifth heat mode, Bong Mode, and a side-mounted removable oven door. PAX's headline for the FLOW is a redesigned wide airpath with up to six times the draw strength of previous PAX models.

PAX's oven capacity page lists the FLOW oven at up to 0.40 g, and its warranty extends from 2 to 4 years if registered within 30 days, against 3 years for a registered FOUR. It comes in Blue Haze, GreenStone and Onyx. We have no tester notes on the FLOW, so this is PAX's data rather than our own observation.

PAX FOUR vs PAX FLOW: Which Should You Buy?

Feature	PAX FOUR	PAX FLOW
Heater	High-output hybrid (conduction and convection)	Hybrid conduction and convection
Heat modes	4 presets	5, including Bong Mode
Charging	USB-C, about 90 minutes from empty	USB-C, full charge in under 40 minutes
Battery	Up to 50 minutes, around 5 sessions (PAX)	Not stated in our source material
Oven	Funnel-shaped opening; magnetic lid	Up to 0.40 g; side-mounted removable door
Output claim (PAX)	Up to 50% more vapour than other PAX devices	Up to six times the draw strength of previous PAX models
Warranty	2 years, plus 1 when registered within 30 days	2 years, extending to 4 when registered within 30 days
Colours	Onyx, Greenstone, Oxblood (we stock Onyx and Greenstone)	Blue Haze, GreenStone, Onyx

Choose the PAX FOUR if flavour, simple one-button control and easy loading matter most and you only use dry herb. Pick the PAX FLOW if you want a full charge in under 40 minutes, Bong Mode, a published 0.40 g oven or the 4-year registered warranty.

View product £312.00 Original price was: £312.00.£199.00Current price is: £199.00.

What to Look for When You Buy a PAX FOUR

Size and oven capacity. In testing the FOUR was noticeably larger than earlier PAX models, so handle one first if pocket size matters. Smaller ovens trade capacity: PAX lists the PAX Mini at about 0.20 g against 0.35–0.5 g for the PAX 2, PAX 3 and PAX PLUS, and our PAX Mini review covers that trade-off.

Warranty registration. When you buy a PAX 4, register it within 30 days to turn the 2-year limited warranty into 3 years; the FLOW goes from 2 to 4 years under the same rule.

Storage and alternatives. A PAX smell proof case suits carrying, but check its sizing against the FOUR's larger body, or browse our storage range. For the wider line-up, read our PAX portable vaporiser review, and our DynaVap review covers a battery-free alternative. Still choosing a format? Dry herb vaporiser vs bong compares the two.

PAX FOUR FAQs

Is the PAX 4 the same as the PAX FOUR?

Yes. PAX 4 is how many people search for the PAX FOUR, PAX's fourth-generation dry herb vaporiser (model X400).

How long does the PAX FOUR battery last and how long does it take to charge?

PAX says up to 50 minutes, or around 5 sessions, per charge, with higher modes using more battery. It charges from 0% to 100% in about 90 minutes over USB-C.

Can the PAX FOUR be used with concentrates?

No. It is dry herb only and not compatible with concentrates, liquids or the PAX Concentrate Insert. The PAX PLUS supports concentrates with its Complete Kit insert.

How do you clean the PAX FOUR?

Wait 10 minutes after use, then every 3-5 sessions run the wire brush with isopropyl alcohol through the vapour path and soak the oven screen for 15 minutes.

Where can I find the PAX FOUR manual?

PAX publishes an official PAX FOUR Quick Start Guide covering set-up, heat modes, charging and cleaning.

Where can I buy the PAX FOUR in the UK?

Easy Vapes stocks it in Onyx and Greenstone: buy the PAX FOUR in the UK for £177.60 Original price was: £177.60.£160.00Current price is: £160.00.. It is sold to adults aged 18 and over only.

Verdict: Is the PAX FOUR Worth It?

Yes, for adults who want flavour, simple controls and easy loading in a dry herb only device. We found the best flavour on yellow (about 210°C by our tester's reading), with the lower modes far more discreet, and the one-button layout and funnel-shaped oven keep it easy to use. Its weaknesses are real: it is noticeably larger than earlier PAX models and may need charging more often than the PAX 3.

Choose the PAX FLOW for a full charge in under 40 minutes, Bong Mode, a 0.40 g oven or the 4-year registered warranty, the PAX PLUS for concentrates, or the PAX Mini 2 if size comes first. For everyone else, the PAX FOUR dry herb vaporiser at £177.60 Original price was: £177.60.£160.00Current price is: £160.00. is the PAX we would pick.