Heat is not your phone's friend. If you've ever felt your device getting uncomfortably warm after binge-watching in UHD or running AI-powered tools, you've noticed how heat can slow your smartphone's performance or burden its battery. Sometimes, a vigorous gaming marathon or lengthy work session can even make a device too hot to hold comfortably.
Vapour chamber technology helps prevent these performance drop-offs and hot spots. The tech works by spreading heat evenly across the device through a thin, sealed chamber that uses liquid evaporation and condensation to regulate temperature. And while it seems vapour chambers are suddenly the buzzword of the day, the reality is that Samsung has been refining this tech for years across multiple generations of Galaxy devices.
With the Galaxy S25 Ultra, vapour chamber innovation reaches new heights, resulting in a truly cooling phone. Here are six reasons why Samsung continues to lead the way in smartphone cooling.
1. Samsung has been using vapour chamber technology for more than half a decade.
While some smartphone brands are just catching on, Samsung has been building cooling technology into its high-end devices for years. The Galaxy S10+ had an early version of the vapour chamber back in 2019, and by the time the Galaxy S23 Ultra launched, the feature was a standard part of the series' design.
That track record matters. Samsung has had time not only to introduce the technology but also to iterate and perfect it, making chambers thinner and more efficiently integrated into other system components. With the S25 Ultra, Samsung has achieved the best cooling phone to date — and a device that can handle even the heaviest of workloads.
2. The Galaxy 25 Ultra's bigger chamber = better performance
Inside the Galaxy S25 Ultra is one of the largest vapour chambers ever included in a Samsung device, and it's designed to spread heat evenly across the phone's body. That means fewer "hot spots" where your fingers might feel the burn, as well as a steadier operating temperature that keeps the processor firing at full speed.
This matters when you're recording 8K video at 60 fps, gaming with maxed-out graphics, or juggling multiple apps at the same time. Where a smaller chamber might buckle, the S25 Ultra's advanced design keeps temperatures stable and ensures peak performance without thermal throttling. In practical terms, that translates to consistent high performance during extended use, whether that's during a workday jam-packed with multitasking or a long-haul travel journey where you'll be watching your three favourite films back to back.
3. Powerful cooling doesn't mean bulky design
One of the challenges with cooling systems is size — larger solutions can add bulk or weight to a phone. Samsung's engineering team has consistently refined the vapour chamber design so that it fits into sleek flagships without compromise. (Other well-known brands have not had such success and have had to make trade-offs, such as relying on three lower-pixel cameras instead of balancing both optics and cooling.)Â
At the same time, the S25 Ultra weighs just 218 grams — and despite housing an advanced cooling system, it remains slim at 8.2mm.
This balance of performance and portability is why Samsung can offer cutting-edge cooling without sacrificing design. The S25 Ultra still feels premium in your hand, with titanium casing and Gorilla Glass protection, but under the hood it's a machine built for stability.
4. Cooling is the secret to true gaming power
Mobile gaming pushes devices harder than almost any other activity. High-frame-rate rendering and real-time data transfer generate heat quickly. Without proper cooling, even the most powerful chip can struggle to keep pace.
The S25 Ultra's octa-core processor is paired with a 120Hz Dynamic AMOLED 2X display that's tailor-made for hiccup-free gaming. Vapour chamber cooling is what lets you maintain 240fps slow-motion recording or marathon RPG runs without worrying about overheating. That makes it one of the best gaming phones with a cooling system built to minimise lag and keep frame rates stable. For serious gamers, this is the kind of invisible engineering that makes all the difference.
5. Smarter battery efficiency allows for better thermal control
Higher operating temperatures can cause your battery to drain and even shorten long-term battery health. With its 5,000mAh battery[1], the S25 Ultra already offers impressive longevity, but it's the vapour chamber that makes the power last longer.
In everyday terms, that means more time streaming, creating or scrolling, without suddenly dipping into battery-saving mode halfway through the day. Your phone stays cool in your hands even during a long commute gaming session or when filming your kid's soccer game in 8K — no more worrying about it slowing down just as things get exciting.
6. Advanced cooling is the backbone of Samsung's AI and video innovation.
The Galaxy S25 Ultra is as much an AI powerhouse as it is a smartphone. Tools like Generative Edit[2] and Audio Eraser[3] depend on high-intensity processing, and effective cooling allows these features to run smoothly.
The same goes for the S25 Ultra's video capabilities like recording at UHD 8K resolution with AI-enhanced stabilisation. For content creators, this also means smoother 8K editing and exporting without the phone overheating, positioning the S25 Ultra among the best phones for video editing.
All of your day-to-day data-crunching demands a cooling system that can keep up. Vapour chambers are the quiet enablers and unsung heroes of Samsung's AI and multimedia performance.
Tech trends tend to follow a set cycle: a breakthrough emerges, early adopters fine-tune it, and then suddenly it's "the" feature everyone is talking about. Vapour chambers may be having their mainstream moment in 2025, but for Samsung, the feature is far from "new" news.
For keeping your phone cool under pressure, the Ultra more than meets the bar — it sets it.
Frequently asked questions (FAQs):
Q: What is vapour chamber cooling in the Galaxy S25 Ultra?
A: Vapour chamber cooling spreads heat evenly across the phone using a thin, sealed chamber with liquid evaporation and condensation, helping the device stay cool even during heavy workloads.
Q: Does the Galaxy S25 Ultra overheat during gaming?
A: No — vapour chamber cooling allows marathon gaming sessions and 240fps recording without thermal throttling, keeping both performance and comfort steady.
Q: Does advanced cooling make the phone heavier or bulkier?
A: Not at all. Despite housing an advanced cooling system, the S25 Ultra remains slim at 8.2mm and weighs just 218 grams.
Q: How does cooling affect the battery life of the Galaxy S25 Ultra?
A: By keeping temperatures lower, the vapour chamber helps the 5,000mAh battery last longer and maintain long-term health.
Q: How does cooling support AI features on the Galaxy S25 Ultra?
A: AI-powered tools like Generative Edit and Audio Eraser require high-intensity processing. Vapour chamber cooling ensures these features run smoothly without lag.
Disclaimers:
[1] Typical value tested under third party laboratory conditions. Rated minimum capacity of S25 Ultra is 4855 mAh
[2] Samsung account login is required for certain AI features.
[3] Samsung account login required. Six types of sound can be detected; voices, music, wind, nature, crowd and noise. Results may vary depending on audio source & condition of the video.