Satisfaction Guaranteed
Easily mount or release with no tools
Even in harsh environments
Exceeds Coast Guards, ABYZ and Military Specification rating Certified and Independently Tested now with the UL 1278 standard
Bought this to keep my RV basement warm, where I keep my lithium batteries. Thought I might need another but no way, this thing works great! Keeps the whole basement warm and helps make sure my water pipes are safe too.
Excellent performance for 11+ years! This is one reliable piece of kit. I monitor performance via a logging thermometer and even when it is negative 10 and fiercely windy the engine compartment has maintained 40 degrees Chaparral winters on a lift (out of the water) and the extremeheater handles the business. Bravo!
Over the past 16 years, I have used Xtreme heaters in my boats. First, for 14 years in a Silverton 43 Sportbridge and most recently in a Monterey 295SY. I have always felt confident that my engines & fresh water systems were safe during the winter. Great safe heater!
I've got a pair of heaters installed in the back of an F-150. Keeps all the fire/ems equipment unfrozen and ready for work as the truck has to stay outside.
They don't get too hot, they turn on automatically, what's not to love?
I have a 23.5 ft Cobra performance boat with 496 HO. I always take it out of our boat house for the winter. My wife didn’t want our boat in the garage anymore for the winter. I did my homework and ordered this Extreme 400wt heater. It performed perfectly with temps as low as the mid 20s. Last week I cleaned and cranked over my 496 and no issues, all is good. If you’re looking for a reliable heater for the winter months, look no further, Extreme has your solution.
Xtreme Heaters In My 370 Sundancer
I use two Xtreme heaters in my 370 Sundancer to protect it from potential freeze damage during the winter months. The Xtreme heaters are always reliable and have never let me down. I rest assured that my boat is safe using Xtreme products. – David Bowers
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Peace Of Mind
My Xtreme Heater gives me the peace of mind to know that my investment is safe during those cold winter months. Installation was simple and the pre-programmed heat settings were perfect for my environment. Quality construction and a great overall value. Count me as a very satisfied Xtreme Heater owner. -Sam Baker
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Our 50 Princess Fly Bridge In The Water All Year
We keep our 50 Princess Fly Bridge in the water all year. We use it all year as long as the water doesn’t freeze–winter boating is actually pretty nice on the Chesapeake Bay. Without our Xtreme Heaters keeping the engines warm and the cabin livable, it would be a whole different story. -MK
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RV For Lake Tahoe
We could not be happier with our purchase. We love the “set it and forget it” setup. When the van is home we simply plug in the heater and open a few cabinets and it maintains a perfect temp above freezing. When we are ready to adventure we unplug it and off we go. It does not get any simpler. Thanks for a great product Steve. - Greg & Lourdes
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My name is Lt. Joe Crowshaw; I work for the City of East Providence Fire Department (EPFD) in Rhode Island. I was responsible for the purchase of all of the deck gear and firefighting equipment to be used aboard the boats. I can honestly say that there is no other product available that comes close to the Xtreme Heaters performance, safety and economy of operation. - Lt. Joe Crowshaw
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I bought a 600 watt Xtreme heater a couple of weeks ago after speaking with you. It’s mounted in the engine compartment of my 2017 Rinker 370EX, 37 foot with twin Mercruisers 8.2L, located on Old Hickory Lake in the Nashville, TN area.
This is a graph of the outside temperature (yellow) and inside the engine compartment (blue line). Knowing my bilge is being kept at 40 - 50 F regardless of the outside temperature gives me great piece of mind.Al Wagner![]()
Steve with Xtreme
Heaters is great! Be confident in his product and the service
you’ll receive with it.
Thanks again Steve – You’ve created a lifelong customer in
me!Blane![]()
Our Story
The Xtreme Marine Engine Compartment Heater was developed to provide a safe and consistently reliable solution to protect your boat’s engines and critical components from freeze damage. Whether part of your overall boat winterization strategy, or a way to extend your boating season in colder months, Xtreme’s boat engine heater is key. Our customer testimonials demonstrate the level of satisfaction our products have brought to boaters in the US and around the world.
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Bought this to keep my RV basement warm, where I keep my lithium batteries. Thought I might need another but no way, this thing works great! Keeps the whole basement warm and helps make sure my water pipes are safe too.
Was nervous about keeping our boat on the water during the cold winter months here in North Idaho, not anymore! We have been monitoring the bilge of our 24 ft cabin cruiser via a remote WIFI temp sensor, and so far this heater has performed flawlessly! Finally looking forward to some year-round fishing without worrying about our motor freezing.
Excellent performance for 11+ years! This is one reliable piece of kit. I monitor performance via a logging thermometer and even when it is negative 10 and fiercely windy the engine compartment has maintained 40 degrees Chaparral winters on a lift (out of the water) and the extremeheater handles the business. Bravo!
Over the past 16 years, I have used Xtreme heaters in my boats. First, for 14 years in a Silverton 43 Sportbridge and most recently in a Monterey 295SY. I have always felt confident that my engines & fresh water systems were safe during the winter. Great safe heater!
I bought my heater over 10 years ago and it still works great. I originally bought it for my 40ft cruiser and it kept the bilge area from freezing. I always winterized just in case we lost power BT every time I checked it was working great. Mulch better for the batteries and everything down there.
Love my Extreme Heater. Two seasons in and works great.
I've got a pair of heaters installed in the back of an F-150. Keeps all the fire/ems equipment unfrozen and ready for work as the truck has to stay outside.
They don't get too hot, they turn on automatically, what's not to love?
I have a 23.5 ft Cobra performance boat with 496 HO. I always take it out of our boat house for the winter. My wife didn’t want our boat in the garage anymore for the winter. I did my homework and ordered this Extreme 400wt heater. It performed perfectly with temps as low as the mid 20s. Last week I cleaned and cranked over my 496 and no issues, all is good. If you’re looking for a reliable heater for the winter months, look no further, Extreme has your solution.
I have a 23.5 ft Cobra performance boat with 496 HO. I always take it out of our boat house for the winter. My wife didn't want our boat in the garage anymore for the winter. I did my homework and ordered this Extreme 400wt heater. It performed perfectly with temps as low as the mid 20s. Last week I cleaned and cranked over my 496 and no issues, all is good. If you’re looking for a reliable heater for the winter months, look no further, Extreme has your solution.
I love my Xtreme heater. Easy to use and does the job all winter long keeping my bilge dry and my motor oil/water warm. Gives me peace of mind in the winter non boating season.
I have two 300 watt heaters on my 38 foot sailboat. One in the forward head, I open the hatches so the piping is all open to the area the heater is in. The other is in the aft part of the boat in the lazarette/engine compartment. They do a very good job. I do suggest the use of surge protection.
My first winter with xtreme heater on my inboard which gave me a total sense of comfort on keeping my boat protected!
My first winter with xtreme heater on my inboard which gave me a total sense of comfort on keeping my boat protected!
I have used the heater in both our boat and the water compartment in a class A RV. Both applications worked excellent. Will certainly purchase another if the application arises.
Purchased both the bilge heater for the belly around the water input and the counter top heaters. I love the countertop heaters and here in Alaska they help hold down propane usage when plugged to shore power. The heaters move air through quietly and efficiently.
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