• Wireless Thermalution - Yellow Grade
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Wireless Thermalution - Yellow Grade Plus

Usually Ships in 24 hours.
Heat Time:
Heats up in under a Minute
Battery Power:
Battery Power: Includes Two 7.4V Rechargeable Lithium Polymer Batteries. (Waterproof to 300ft)
Battery Duration:
Battery Duration: Low Heat: 4 Hours, Medium: 3 hours, High: 2 hours
Battery Charging:
Included Wall Charger will charge both batteries simultaneously. Batteries take around 4 hours to fully charge. (Car Chargers available here)
Maximum Water Pressure Depth:
Dive up to 300ft below the Surface
Controller Type:
Rechargeable Wireless Controller
Three Temperature Settings:
Three Heat Settings: Low, Medium and High
12 Month Limited Warranty
Thermalution is tested and certified to CE, TUV and UL and IP waterproof standards
Product Includes:
Product Includes: Undrshirt, Two Batteries, Charger and Controller

Product Description

The Thermalution® Yellow Grade Power Heated Undersuit is designed with both the wetsuit scuba diver and dry suit scuba diver in mind.  Using a wireless controller the Thermalution Yellow Grade Plus enables a diver to change the temperature of their drysuit during a scuba dive without having to break the seal of the dry suit.  

To give divers longer battery life, Thermalution has powered the Yellow Grade suit with two high capacity, 7.4 Volt, rechargeable lithium-polymer batteries. When fully charged the batteries will provide heat for up to 4 hours.  These batteries are around 1 inch thick.

Note:  The Thermalution suit is designed to get warm enough to heat even the coldest of water entering a wet suit.  When diving dry vs a wetsuit, the heat will feel much warmer on the skin.  Most drysuit divers wear a thin layer beneath the Thermalution when diving in a drysuit, due to the large amount of warmth produced even on the low setting.  These scuba divers are then able to utilize a warmer temperature setting without overheating the skin on their back.

Thermalution® is by far the best heated wetsuit product available on the market!  It uses a non-metallic heating panel, positioned on the back to warm up your core area.  With a weight of only 2-3 lbs, it is worn virtually unoticed beneath your wetsuit or drysuit.  Of all heated wetsuit products currently available, Thermalution® has the capacity to heat up in the shortest amount of time (under a minute).   

Thermalution® uses Far Infrared Ray technology, which doesn't just heat your skin like many other products.  Thermalution® actually heats deep within your core, giving you improved blood circulation, enhanced cell and tissue regeneration, pain relief, and comfort to the entire body.  You will be amazed at how much more comfortable you will feel after turning on the suit to even only the lowest of three settings.  Once you have a dive in a Thermalution, you won't ever want to venture out on a winter day without one!

Product Reviews

Write your own product review

Showing reviews 1-10 of 22 | Next

  1. Cold no more

    Posted by Greg on 25th Apr 2018

    I get cold easily in the water especially when sitting in one place trying to get the perfect photograph. I bought one each for me and my wife because we would get cold by the fourth dive of the day on live aboard dive trips while doing our photography. Most of the time we would pass on the night dives because we were shivering to much. Also, when the water temperature gets below 79 degrees we would not go diving. We just got back from diving Blue Heron Bridge, Rivera Beach, Florida, for four days. It is only one dive a day because of the tide schedule and visibility. The air temperature was 58 degrees and a water temperature of 75 degrees. I dive a 5 mm full suit with the wife diving a 3 mm full suit. Dive times from 90 minutes to 105 minutes moving slow and sitting still trying to get the best photo possible. I was surprised by the performance of my Thermalution Yellow Grade Plus heated vest. It did what I wanted and as it advertised what it would do and that is it kept my core warm. Without the heated vest I would not have been able to complete an entire dive comfortably and without shivering. We never turned a dive because of comfort (warmth) but only because of the tide turning and mucking up the visibility for photography. The batteries never ran out even thought we had the vest on the high setting for most of the dive. This vest just extended our dive season by months and can't wait to try it on our next live aboard trip in August. We won't be missing any night dives again because of being cold.

  2. Very Warm

    Posted by Phil on 26th Oct 2017

    Almost too hot for drysuit. I only use lowest setting and i can't have it on for more than 5 minutes without feeling a burning heat from the elements. Cycling though three heat level settings to turn off is a little annoying. The vibrating receiver is an absolute necessary in this application, makes me feel a lot more confident in the operational state.
    There is nothing quite like turning on the heat when that cold starts to kick in at depth and/or at end of dive. Feels so nice and keeping my core warm means my hands stay pretty warm too.

  3. Updated Review - Caveat

    Posted by Elliot Royce on 19th Jun 2017

    Customers should be aware that if you lose the remote controller, the distributor needs to send the suit back to Taiwan (they will pay the postage) to pair another controller with it. And it will cost you $200.

    It also seems a bit underpowered. In 63 degree water in a 5mm semi-dry suit I was still chilly although nowhere near as cold as my buddies without the vest!

  4. on my 2nd one

    Posted by San Diego Diver on 29th May 2017

    Fantastic service in getting my 2nd vest shipped directly from the manufacturer. Very pleased with this item, first one lasted about 4 years with heavy use. For this one, I asked a tailor to add a plastic front zipper to reduce wear and tear on the wiring when donning/ doffing.

  5. Great overall but needs a few tweaks

    Posted by Elliot Royce on 7th May 2017

    I've used this now for 3 dives on Trimix and it definitely helps a lot. Also, very nice on the boat after the dive when wet and a cool wind is blowing. My suggestions for improvement are: 1) better pockets for the batteries so they don't slip out and to make it easier to insert them (try velcro); 2) better connectors for the wires (one of mine is already about to break because they are very fiddly); and 3) offer it with an integrated hood.

  6. Yellow Grade with Dry suit

    Posted by walter rosenthal on 6th Jul 2016

    I am a male and 50 years old and just bought one of these in a XL size and it works really well. I used it with a drysuit and the remote on the arm works great. When your underwater and click the switch once you can hear and feel the vibration on your back that it received your selection. It starts warming in about a minute or two. I wore a teeshirt under it and a sweat shirt over it in about 45 degree water in Lake Charlevoix in michigan with a 7mm drysuit in 30-60feet of water. It allowed me to stay underwater for over two hours. The heating elements are only on your central back area. I wish it would cover the front too. If I wouldn't have had this on my time underwater would have been almost cut in half. There are three settings and they are easy to use. You can shut it off if it gets to hot. I did still get cold in the end but this allowed me to double my underwater time. The batteries never ran out of juice. The batteries are under your armpits almost and over time are a little uncomfortable. but otherewise in a good location. Works great!

  7. Fantastic value!

    Posted by Phil K on 10th Jan 2016

    The heated vest has been a great heat producer to keep you from getting cold during extended dives. Have worn under my wetsuit during both morning and afternoon training sessions on a single charge. Also works very well under my Drysuit to keep the chill off during 38 degree dives.

  8. Best SCBA purchase this year

    Posted by Michael Colton on 28th Dec 2015

    Totally impressed at how well the Thermalution yellow grade suit performs. It made winter diving in the Red Sea much more pleasant and took us from a dry suit to a 5 mil. Suit lasted for at least 2 back to back dives before needing a recharge. The wrist controller made changing temperature settings a breeze. We should have bought them sooner!

  9. Great product, but needs better instructions

    Posted by Lee Clark on 12th Aug 2015

    MUNISING 2015-
    I looked at the amount of dive gear strewn around my seat as the boat left the dock out of Munising, Michigan. Three bags consisting of a bag containing a drysuit, one bag of undergarments and one bag of dive gear. For the past three years my diving had consisted of mostly Caribbean diving, where all you need is the most basic of dive gear. But this was going to be different, just how different I was about to find out.
    “Welcome to Lake Superior diving” the dive boat captain told us. “Where it is always deep, dark, and cold.” What in the world was I doing here? Basically I am a warm water diver, among Michigan divers that think that diving in any water above freezing makes it a good day to go diving. To answer what was I doing here; we have to go back over a year to a pod cast hosted by Rich Synowiec. Rich’s show, DiverSync, is usually on Tuesday evenings on Talkshoe.com (Call ID 89155). Rich owns several dive shops in the Ann Arbor area, and is a professional dive instructor and hosts a weekly diving talk show about all things diving, usually involving dives done during the past week with students, friends, or family. Rich talks about every dive trip like it is the one last dive you have to make before you can say you have dived it all. His annual Munising trip is usually sold out nearly a year in advance, and is the start of a number of trips throughout the coming summer months.
    “Ten minutes till we anchor,” the captains voice brought me back to the present. I barely had my thick undergarments on. One foot was slipped into my drysuit and I had to stop and think, “How do the suspenders go?” “Is it inside the legs or outside the legs?” “I really wish I had tried putting this thing on a few more times before the trip,” I thought to myself. A year had passed since I had last put on a drysuit, and several years had passed prior to that last drysuit dive. As stated earlier, I was basically now a warm water diver. As the boat came to a stop and the platform dropped off the stern, the other divers were already making their way to the exit point. My wife helped stuff the hood into my drysuit. I felt like the Michelin Tire man dressed in my DUI XM450 undergarments and my DUI FLX Extreme Drysuit. As my wife helped me put on my Aqualung Black Diamond BCD, I suddenly realized that all my equipment had shrunk since the last time I had used them. “Too many burritos”, my wife commented about the lack of fit regarding my equipment as one by one the rest of the divers exited the boat. All this time Rich waited patiently as I dressed and struggled into my gear. “Suck it in” my wife said and we finally managed to buckle the last of the straps. By now it was just Rick and myself on the boat. As I waddled to the back of the boat, I jumped in and immediately felt relief as the 50 degree water cooled the outside of my suit. Soon Rich and I descended into the depths and my Lake Superior diving had begun. At around 70 feet the wreck of the Smith Moore came into view. Rich and I spent the next 20 minutes exploring and examining the wreckage of this ship. Rich took many photos of me and the other divers around the ship, all the while keeping a constant eye on me that I didn’t do anything crazy. I looked at my depth and temperature gage and 90 feet and 43.6 degrees was the depth and water temperature shown. Amazingly, I never felt cold. Thank you DUI. As the occasional twinge of cold did creep in, I activated my secret weapon, the Thermalution heated undergarment. Any feeling of cold melted away as the heat from the heated vest warmed up my core. I understand that Rich is now going to become a Thermalution dealer. It is well worth the price if while diving being cold is not your thing. Aside from the terrible instructions included with the product, the Yellow Grade heated vest works as promised. As the dive progressed, I felt large chunks of rust falling off my deep and cold water dive skills. By the end of the dive I had my buoyancy, and air consumption under reasonable control. As we started back toward the surface, I felt comfortable at our safety stop and exited the water wanting to do it again. By the end of the fourth dive the next day, I was ready for more. Maybe those Michigan cold water divers are not so crazy after all.
    Next year is Rich’s 10 year anniversary of the Munising trip and it is sure to be another sellout. While it is promoted as a camping and diving trip, my wife and I stayed less than a half mile away in the Comfort Inn. I felt it was the best of both worlds. We got to meet the other fantastic people around the campfire in the evenings; but also got a good night’s rest, minus the mosquitoes.
    In conclusion, while most divers are a generous bunch, I would be amiss if I did not give a shout out to all the people on that trip. They generously donated food, gear, bug spray, and whatever else you needed that you didn’t remember to bring. Thanks to you all, most of whom I will probably never see again, you made my wife and I feel right at home. We are especially grateful to those of you who loaned us their weapons and the ammo to exercise our second amendment rights. My wife now wants to go shooting as often as possible. If you want to take a fantastic dive trip and have the skills needed for that particular dive trip, (Rich spells out the minimum requirements of each trip on his website: www.diversinc.com) then I highly recommend you contact him for a fun and unforgettable adventure. I now hold the record for coming the longest distance for one of Rich’s trips. San Diego to Munising; but as everyone knows, records are meant to be broken.
    Lee R. Clark
    San Diego, CA

  10. Being Warm is Good

    Posted by Unknown on 9th Apr 2015

    This was a birthday present for my wife to go along with her new 5/4/3mm wetsuit. The Yellow Grade Plus fit well, was warm and the batteries charged quickly. It was easy to operate and the batteries lasted thru two dives and kept her warm in the 76 dF water.

Showing reviews 1-10 of 22 | Next

Warranty Information

We offer a Full One Year Warranty on all Thermalution Heated Wetsuit Products purchased directly through HeatedWetsuits.Com.  This covers all heating elements, stitching, and battery power components. 
Petatech International Company, Ltd (Makers of Thermalution) offer a 12-month Limited Manufacturer's Warranty from the date of purchase from any retailer worldwide.  This warranty covers any Defective Materials or Components and Faulty Workmanship for one year.  Thermalution also offers a 6-month warranty on all batteries and components.  Customers may register their Thermalution products online for a full year manufacturers warranty on the batteries as well.