{"id":651,"date":"2026-10-26T13:49:32","date_gmt":"2026-10-26T05:49:32","guid":{"rendered":"http:\/\/www.asemankitchenware.com\/blog\/?p=651"},"modified":"2026-10-26T13:49:32","modified_gmt":"2026-10-26T05:49:32","slug":"are-there-heating-torches-that-can-be-used-underwater-49f8-c85e05","status":"publish","type":"post","link":"http:\/\/www.asemankitchenware.com\/blog\/2026\/10\/26\/are-there-heating-torches-that-can-be-used-underwater-49f8-c85e05\/","title":{"rendered":"Are there heating torches that can be used underwater?"},"content":{"rendered":"

Hey, let\u2019s cut to the chase \u2013 if you\u2019ve ever been working on underwater tasks, whether it\u2019s marine construction, salvage, pipeline repair, or even restoring old sunken artifacts, you\u2019ve probably stared at the water and thought: can I just use a regular heating torch down here? Spoiler alert: nope. But that doesn\u2019t mean there\u2019s no such thing as a heating torch that works underwater. I\u2019m the go-to guy for heating torches over here, and I\u2019ve spent years fielding this exact question from contractors, marine technicians, and hobbyists who are tired of letting water kill their projects. Today, I\u2019m breaking this down like I would with a buddy in the supply bay \u2013 no stuffy jargon, no nonsense, just the real deal on underwater heating torches. Heating Torch<\/a><\/p>\n

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First off, let\u2019s talk about why regular torches die underwater. A standard propane or oxy-acetylene torch works by mixing fuel gas and oxygen, igniting that mix, and producing a hot flame that burns super efficiently in open air. Submerge that same setup? Water is way denser than air, so it smothers the flame immediately. Even if you could get a spark going, the water pulls all the heat away faster than the flame can build it, and the gas mix gets diluted the second it hits the wet stuff. Also, water can seep into the torch\u2019s valves and hoses, gunking them up or causing backfires \u2013 that\u2019s a safety hazard no one needs. I\u2019ve seen a guy blow a hose on a job last year because he tried using a regular torch at a shipwreck site, and let me tell you, that wasn\u2019t a good day for anyone on the team.<\/p>\n

So what\u2019s the fix? The torch has to be built from the ground up to fight water. And yeah, they actually exist \u2013 I stock them, because I\u2019ve tested enough duds to know which ones actually work. Let\u2019s get into how these bad boys work, because it\u2019s not rocket science, but it is clever. First, the fuel supply isn\u2019t just regular pressurized gas. Most underwater heating torches use what\u2019s called a \u201cclosed-loop\u201d fuel system \u2013 that means the gas is stored in a chamber that\u2019s kept at the same pressure as the surrounding water. Why? Because if the pressure isn\u2019t matched, water would push its way into the gas lines, and we already know how that ends. Think of it like a diver\u2019s buoyancy vest \u2013 you adjust pressure to stay level, same idea here.<\/p>\n

Then there\u2019s the ignition part. A regular spark plug won\u2019t cut it underwater, because water conducts electricity so the spark fizzles out. These torches use a hot surface igniter, kind of like a high-tech glow plug in a diesel engine, that gets hot enough to ignite the fuel even when it\u2019s surrounded by water. And the flame itself isn\u2019t just a wimpy little fire \u2013 it\u2019s a jet of superheated gas that\u2019s pushed out at a pressure high enough to punch through the water\u2019s surface tension. I tested a cheap knockoff once that claimed to be underwater-ready, and the flame just kind of sputtered a foot away from the torch tip. Total garbage. The good ones? You can hold the tip under 20 feet of water and get a steady, 2,000\u00b0F flame \u2013 enough to melt metal, thaw frozen pipes, or loosen corroded bolts, which is exactly what most people need them for.<\/p>\n

Wait, let\u2019s talk about the different types, because not all underwater heating torches are made for the same job. I break these down into two main categories, and I\u2019ve got both in stock because one size definitely doesn\u2019t fit all. First, there\u2019s the portable, handheld underwater heating torch. These are for smaller jobs \u2013 like a diver doing salvage work, thawing a water pipe that\u2019s frozen under a dock, or repairing a small section of a marine railing. They\u2019re lightweight, easy to maneuver, and run on smaller fuel canisters that are designed to match water pressure up to like 100 feet deep. Last month, a guy called me panicking because his team needed to fix a broken cleat on a fishing boat that was sitting in 15 feet of saltwater, and the propane they tried wasn\u2019t touching the corroded bolts. We got him one of the handheld ones, and he texted me 20 minutes later saying he had the bolts loose and was back on track. Total game-changer.<\/p>\n

The other type is the heavy-duty, rig-mounted underwater heating torch. These are for big projects \u2013 like laying underwater pipelines, doing commercial salvage of sunken cargo, or repairing offshore rig parts. These are way more powerful, can go way deeper (some models work at 300+ feet, which is wild), and run on bulk fuel supplies, so you don\u2019t have to swap canisters every 10 minutes. I supplied a construction company last year that was working on a new underwater sewer line, and they used one of these rig-mounted torches to weld the pipe sections together even while tide was coming in. No delays, no issues, which saved them like three days of work \u2013 that\u2019s real money for a project that runs on a tight schedule.<\/p>\n

Now, let\u2019s get real about what people actually use these torches for, because I don\u2019t want anyone buying one for a job it can\u2019t do. The biggest use cases are: marine construction (welding, cutting, heating metals underwater), thawing frozen water lines or equipment in cold climates (way better than hauling a whole crew out in a snowstorm), salvage and recovery (heating to loosen heavy metal parts on sunken ships or cars), underwater restoration (working on old docks, lighthouses, or sunken historical items), and even aquaculture stuff \u2013 like heating water lines for fish farms in cold areas, or thinning ice around net pens. Wait, I had a fish farm customer last winter who used one to heat a blocked intake pipe so they didn\u2019t lose a whole batch of tilapia. That\u2019s not just a job \u2013 that\u2019s livelihood, so getting the right tool matters.<\/p>\n

But here\u2019s the thing I always tell people: you can\u2019t just pick any underwater heating torch off the shelf. There are so many cheap, no-name models out there that lie about their specs. I\u2019ve had customers bring me torches they bought online that claimed to work at 50 feet, but when we tested them in my deep test tank, the flame died at 10 feet. Don\u2019t waste your money on that. What should you look for? First, depth rating \u2013 make sure it\u2019s rated for the maximum depth you\u2019ll be working at, plus a little extra for safety. Second, heat output \u2013 measure in BTUs, basically how hot it gets. For small jobs, 50,000 to 100,000 BTUs is enough; for heavy rig work, you need 200,000+ BTUs. Third, safety features \u2013 any good underwater torch should have a backflow prevention valve, so if water does get in, it can\u2019t cause a flashback, and they should have a pressure relief system so you don\u2019t have to worry about the hose bursting. And finally, make sure it\u2019s designed for the environment \u2013 saltwater is way more corrosive than freshwater, so if you\u2019re working in the ocean, you need a torch with corrosion-resistant parts. I learned that the hard way \u2013 I sold a guy a freshwater-rated torch for a saltwater job a while back, and the rust ate through the valve in a week. Oops. Never again.<\/p>\n

Wait, let\u2019s address a common myth I hear all the time: \u201cCan I just use a regular welding torch with a waterproof cover?\u201d No, that\u2019s not a thing. I\u2019ve seen people try that, and it ends badly. The cover restricts the gas flow, it can trap water, and even if you get a flame, it\u2019s not consistent enough to do any real work. Underwater heating torches aren\u2019t just a regular torch with a waterproof bag \u2013 they\u2019re engineered to handle the pressure, the density of water, and the constant immersion. It\u2019s like comparing a regular raincoat to a drysuit \u2013 one works for a little mist, the other works when you\u2019re fully underwater. That\u2019s the same vibe here.<\/p>\n

Another thing I always warn people about: safety training. Using an underwater heating torch isn\u2019t the same as using one on land. You can\u2019t just pick it up and go. You need to know how to handle the pressure lines, how to test the torch before every dive, how to respond if the flame goes out underwater (which can cause gas buildup, so you have to purge the line properly), and how to avoid burns or gas exposure. I always offer free mini-training for anyone who buys a torch from me, because I don\u2019t want someone getting hurt on my watch. Last year, a contractor bought a handheld torch and didn\u2019t do the training, and he almost had a backfire because he didn\u2019t know how to prime the line correctly. Luckily, he was in shallow water and okay, but that scared me. So safety isn\u2019t an afterthought \u2013 it\u2019s non-negotiable.<\/p>\n

Now, let\u2019s get to the part you probably care about: how much do these things cost? I know no one wants to drop a bunch of money on a tool, but let\u2019s be real \u2013 you get what you pay for. A cheap, no-name handheld torch might run you $500, but it\u2019ll die after a few uses, maybe even fail on a job. A good, reliable handheld torch that\u2019s tested and rated? Around $1,500 to $2,500. Heavy-duty rig-mounted ones start at like $10,000, but they\u2019re built to last years on commercial projects. I always tell customers to look at the lifespan and the warranty \u2013 the good ones come with a 2-year warranty, and if something goes wrong, I can get you a replacement part the next day, no hassle. The cheap ones have 30-day warranties and you can never find anyone to help when they break.<\/p>\n

Wait, let\u2019s circle back to the original question: are there heating torches that work underwater? 100% yes. I\u2019ve sold hundreds of them, I\u2019ve tested them, I\u2019ve seen them solve problems that regular tools can\u2019t. But they\u2019re not a gimmick, they\u2019re specialized tools that require a little know-how and the right model for your job. I\u2019ve had guys email me saying \u201ccan I use this to melt ice on my dock?\u201d and I tell them yes, get the handheld one with a 50-foot depth rating, it\u2019s perfect for that. I\u2019ve had big construction companies call me for rig-mounted ones that can go 200 feet deep, and I supply those too.<\/p>\n

If you\u2019re reading this and you\u2019re tired of being stuck with underwater jobs that regular tools can\u2019t handle, hit me up. I don\u2019t push the most expensive model just for the sake of it \u2013 I ask you what kind of job you\u2019re doing, how deep you\u2019re working, how often you\u2019ll use it, and I hook you up with exactly what you need, no extra fluff. I\u2019ve been in this business long enough to know that a good tool makes or breaks a project, and I want you to have the right one that works when you need it.<\/p>\n

<\/p>\n

Don\u2019t waste another day fighting water that kills your flame. Grab the right underwater heating torch, do a little safety training, and get back to finishing your job on time. I\u2019m here if you have questions, no pressure, just real answers from someone who actually uses these tools every day.<\/p>\n

Nitrogen Gas Regulator<\/a> References<\/p>\n

    \n
  1. NOAA Marine Technology Society. (2021). Underwater Tool Design and Safety Standards for Commercial Marine Operations.<\/li>\n
  2. International Association of Oil & Gas Producers. (2022). Guidelines for Subsea Construction and Maintenance Equipment.<\/li>\n
  3. American Welding Society. (2020). Underwater Welding and Cutting: Equipment and Best Practices.<\/li>\n<\/ol>\n
    \n

    Zhejiang Bohong Intelligent Technology Co., Ltd.<\/a>
    As one of the most professional heating torch suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to wholesale cheap heating torch made in China here from our factory. Also, custom service is available.
    Address: NO.1118 XINAN ROAD, NANXUN DISTRICT, HUZHOU CITY, ZHEJIANG PROVINCE, CHINA
    E-mail: kevin@buohuong.com
    WebSite:     https:\/\/www.bhinstruments.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey, let\u2019s cut to the chase \u2013 if you\u2019ve ever been working on underwater tasks, whether … Are there heating torches that can be used underwater?<\/span>Read more<\/a><\/p>\n","protected":false},"author":372,"featured_media":651,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[614],"class_list":["post-651","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-heating-torch-4cec-cc81e7"],"_links":{"self":[{"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/posts\/651","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/users\/372"}],"replies":[{"embeddable":true,"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/comments?post=651"}],"version-history":[{"count":0,"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/posts\/651\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/posts\/651"}],"wp:attachment":[{"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/media?parent=651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/categories?post=651"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.asemankitchenware.com\/blog\/wp-json\/wp\/v2\/tags?post=651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}