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iPhone 18 Pro's Redesigned Vapor Chamber Triples Cooling Surface Area

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Apple today announced a redesigned thermal system for iPhone 18 Pro and iPhone 18 Pro Max, built around a next-generation vapor chamber with three times the surface area of the one in iPhone 17 Pro.

iphone-18-pro-vapor-chamber.jpg

The new vapor chamber constantly cycles deionized water throughout the system for significantly improved cooling performance, allowing the A20 Pro chip to sustain higher performance for longer under heavy workloads.

Apple redesigned the silicon packaging with "custom packaging inspired by our M-series chips," placing the silicon die and memory side by side rather than stacked, which removes the memory from the chip's thermal path and lets the A20 Pro connect directly to the vapor chamber.

According to Apple, the combination of the new packaging, new thermal materials, and the larger vapor chamber delivers up to a 40% gain in sustained performance over the previous generation, which the company calls the highest sustained performance yet in an iPhone.

Article Link: iPhone 18 Pro's Redesigned Vapor Chamber Triples Cooling Surface Area
 
Article Link
https://www.macrumors.com/2026/09/09/iphone-18-pro-redesigned-vapor-chamber/
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Improved thermal management is good. Have not faced the issue of screen becoming dim in bright sunny outdoors on my 17 Pro Max except for a couple of times. So this change is welcome news.
 
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Taq'aix said:
Yeah, apparently they suddenly cracked the code in the last year and made it three times better than the previous vapor chamber. Revolutionary stuff. 😏

Poor 17 Pro owners though. LOL.
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Why poor 17 Pro owners? We have a VC and my thermal performance is much better than 14 and 15 Pros I had. I can actually use it in the summer daylight without dimming and throttling. Plus I get to keep my glorious ornate color and still have top of line 12GB RAM for future proofing 🙂
 
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Could someone explain how the water cooling works? I am going to do some research but if someone knows how exactly that happens to work I am curious. Does it circulate the water? The article says cycles so assume so but how does it do that reliably? Hope this is not a silly question. Assume it's something to do with water vapor.
 
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gsmornot said:
Could someone explain how the water cooling works? I am going to do some research but if someone knows how exactly that happens to work I am curious. Does it circulate the water? The article says cycles so assume so but how does it do that reliably? Hope this is not a silly question. Assume it's something to do with water vapor.
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It's almost making a mini version of Earth's water cycle inside your phone. There's water in the chamber, and when it gets hot, it evaporates and moves to another part of the chamber to spread the heat. As the heat dissapates, the vapor condenses into liquid and goes back to the hot areas (using wicks/capillary action) to collect more heat. The idea is to spread the heat around your phone so the chip area doesn't get super hot.
 
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jacquesvfd said:
It's almost making a mini version of Earth's water cycle inside your phone. There's water in the chamber, and when it gets hot, it evaporates and moves to another part of the chamber to spread the heat. As the heat dissapates, the vapor condenses into liquid and goes back to the hot areas (using wicks/capillary action) to collect more heat. The idea is to spread the heat around your phone so the chip area doesn't get super hot.
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That sounds pretty cool (yes, pun fully activated) and really deserved more of a tech explanation during the event. I realise the majority of the target market won't care but first I've heard of this type cooling in a phone.
 
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jacquesvfd said:
It's almost making a mini version of Earth's water cycle inside your phone. There's water in the chamber, and when it gets hot, it evaporates and moves to another part of the chamber to spread the heat. As the heat dissapates, the vapor condenses into liquid and goes back to the hot areas (using wicks/capillary action) to collect more heat. The idea is to spread the heat around your phone so the chip area doesn't get super hot.
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Spot on. It's a bit like a heat pump, but with fewer moving parts, moving heat from one place to another.
 
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Moving to Las Vegas this month — anyone have hot desert experience with an older phone (eg 16 Pro) vs. the vapor cooled 17 Pro? I’ve seen some reports that it’s a noticeable improvement (decreased throttling/screen dimming). Excited about the even bigger cooling system announced today. My 16 Pro almost shut down in the shade on a 113 degree Vegas day 😬
 
The only time I've felt my 17 PM get hot was charging it in a hot room. This is probably how they managed to get the faster charging. Nice.
 
svish said:
Improved thermal management is good. Have not faced the issue of screen becoming dim in bright sunny outdoors on my 17 Pro Max except for a couple of times. So this change is welcome news.
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Ah very true, and no more harsh hot spots on the back of the phone, the dispersed heat has been great.
 
thedakis said:
Moving to Las Vegas this month — anyone have hot desert experience with an older phone (eg 16 Pro) vs. the vapor cooled 17 Pro? I’ve seen some reports that it’s a noticeable improvement (decreased throttling/screen dimming). Excited about the even bigger cooling system announced today. My 16 Pro almost shut down in the shade on a 113 degree Vegas day 😬
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should be a lot better, ive noticed a nice difference on 17 pro, screen doesnt dim 70% as much I feel . IM in Cali 85-100 degrees
 
thedakis said:
Moving to Las Vegas this month — anyone have hot desert experience with an older phone (eg 16 Pro) vs. the vapor cooled 17 Pro? I’ve seen some reports that it’s a noticeable improvement (decreased throttling/screen dimming). Excited about the even bigger cooling system announced today. My 16 Pro almost shut down in the shade on a 113 degree Vegas day 😬
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I went from a 16 Pro to a 17 Pro (for a storage bump). The 17 Pro stays much cooler and has much better battery life than the 16 Pro. I really liked my 16 Pro, but the 17 Pro was a significant upgrade on that front (plus I like the greater zoom on the camera). I honestly didn't think it would make much of a difference, but I've only felt it get warm a few times versus my 16 Pro that got warm a lot.
 
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jacquesvfd said:
It's almost making a mini version of Earth's water cycle inside your phone. There's water in the chamber, and when it gets hot, it evaporates and moves to another part of the chamber to spread the heat. As the heat dissapates, the vapor condenses into liquid and goes back to the hot areas (using wicks/capillary action) to collect more heat. The idea is to spread the heat around your phone so the chip area doesn't get super hot.
Click to expand...
Thank you for that, it makes sense. I appreciate the explanation.
 
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