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Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket - Large - 800 Watts
Xtreme Heaters

Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket - Large - 800 Watts

Part Number: XH27FR
In Stock
$516.00
RV Heaters
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This heater protects your critical equipment from freezing in your RV or boat. It keeps those large spaces at the right temp with an automatic thermostat. And the quick-release bracket lets you install or remove the heater when the seasons change. Great Prices for the best rv heaters from Xtreme Heaters. Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket - Large - 800 Watts part number XH27FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Xtreme Heaters RV Heaters - XH27FR

  • Electric Heater
  • Xtreme Heaters
  • 110 Volts
  • Winterization
  • 5th Wheel
  • Motorhome
  • Travel Trailer

This heater protects your critical equipment from freezing in your RV or boat. It keeps those large spaces at the right temp with an automatic thermostat. And the quick-release bracket lets you install or remove the heater when the seasons change.


Highlights

  • Keep Large Compartments Warm: 800 watts of heating power with forced-air circulation to evenly warm big RV bays and boat engine spaces.
  • Built for Safety: Ignition-protected and built to run reliably when the weather turns chilly, parked or docked.
  • Set It and Forget It: Automatic thermostat clicks on at 40ºF and off at 55ºF to keep the interior a steady temperature.
  • Simple Seasonal Convenience: Slide the heater in the included bracket in seconds when cold weather returns - no tools required.
  • Easy Operation: Just pull the latch, drop the heater in place, and release.
  • Proven Tough When It Matters: Fully anodized and tested for vibration, humidity, and extreme conditions.

Features to know about

Stop Freeze Damage Before It Starts

Water lines split open when they freeze. Batteries lose charge faster in the cold. Engines, pumps, and other critical systems might not survive those nights that fall below zero. That's exactly what this heater was built to prevent. At 800 watts, it has the power to keep large RV basements and boat engine compartments above freezing, and the forced-air design pushes heat into the corners where damage usually starts.

Added Flexibility with the Quick-Release Bracket

This kit includes a quick-release bracket, designed for RVs and boats where seasonal swaps matter. Instead of unbolting the heater in the spring, just pull the latch to release it and stow it away. When cold weather returns, drop it back into the bracket and it secures in place. The anodized aluminum bracket resists corrosion, so it can stay mounted all year without worry. Plus, the heater itself comes with a 15' marine-rated cord with a standard plug attached, so you've got some length to place it where you need (and you don't need to hardwire anything).

Thermostat Automatically Turns On and Off

You have better things to do than sit there watching a gauge. That's why the thermostat is fixed to switch on at 40ºF and shut down at 55ºF, which is the range that keeps your plumbing, batteries, and tanks safe. It's high enough to stop freeze damage, but it doesn't waste energy making it warmer than you need.

Ignition Protection Keeps You Safe

Putting any electrical gear in an enclosed space can make people cautious, especially around fuel. This unit is ignition-protected, which means it's been tested to make sure it won't ignite fuel vapors in engine compartments or bays. For boaters, that's critical for safety when mounting in the bilge. For RV owners, it means reliable operation even in tight spaces where safety standards really matter.

Specs

Application:

  • RVs and boats up to 35'

Electrical and Operation:

  • Wattage: 800 watts
  • Capacity: 2,729.7 Btus
  • Fan flow: 58 CFM
  • Fan MTBF: 40,000 hours
  • Typical operating current: 6.8 amps
  • Required fuse or breaker size: 20 amps
  • Startup current: 13.5 amps for 1 second

Dimensions and Weight:

  • Heater dimensions: 8" long x 3-1/2" wide 5-1/8" tall
  • Bracket dimensions: 10-7/8" long x 4-3/4" wide x 1-1/4" tall
  • Cord length: 15'
  • Heater weight: 5 lbs
  • Bracket: 1 lb

IP Rating:

  • IP68

Warranty:

  • Heater: 5 years
  • Bracket: 1 year

Notes:

  • If your boat is docked on a lift or trailer, you may need to consider increasing the wattage of the heater up one level to compensate for heat loss. Make sure to cover the fresh air vents to prevent air from escaping and the cold from coming in, resulting in a more efficient heater and saving you money.
  • Because boats vary in materials, insulation, and design, it's essential to carefully assess your specific needs and climate to determine the most suitable heater. In some cases, depending on the size and configuration of your boat, more than one heater may be necessary to ensure adequate protection.


XXXHEAT-800 Extreme Heaters RV and Boat Heater - Heater for RV Basement - Large - 800 Watts

XTRQRL-22 Extreme Heaters Quick Release Mounting Bracket for Boat and RV Electric Heaters - 600 Watts and 800 Watts - Aluminum

Installation Details XH27FR Installation instructions


California residents: click here


Ratings & Reviews

5.0

1 reviews
This heater protects your critical equipment from freezing in your RV or boat. It keeps those large spaces at the right temp with an automatic thermostat. And the quick-release bracket lets you install or remove the heater when the seasons change.

by:

I like that the quick-release bracket on the Xtreme Heaters 800-watt RV Basement and Boat Bilge Heater (XH27FR) makes seasonal storage simple. Instead of unbolting hardware every spring, the bracket stays mounted and the heater slides in or out in seconds, which is especially useful for customers who winterize year after year. Once in place, the automatic thermostat manages the cycling for you, and the forced-air fan helps circulate heat evenly so large RV bays or bilge compartments stay protected instead of leaving cold spots. The ignition-protected, fully anodized build adds durability and safety in enclosed spaces, and the 15-foot marine-grade cord makes it a true plug-and-play setup. For boats up to 35 feet or bigger RV basements, this model provides the higher output needed to prevent freeze damage, while smaller spaces are better matched with the lower-wattage versions.


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See what our Experts say about this Xtreme Heaters RV Heaters

  • In Minnesota Winters How Can You Keep Boat Engine Bay From Freezing?
    Ron, in that climate, I’d recommend going larger. Even though a 26’ boat typically fits the 600W # XH77FR range, extreme cold can push it. The 800W # XH27FR gives you extra buffer. Do you usually leave the boat in the water, or is it on a lift during those cold snaps?
    view full answer...
  • Which Heater Is Best To Keep Bilge From Freezing During Winter On 34 Foot Carver Cruiser Boat
    Derek, the 800W # XH27FR is designed for boats up to 35’, but in a tight compartment with multiple engines and pumps, many owners prefer using two smaller heaters like a pair of 400W # XH67FR or 600W # XH77FR on opposite sides. That creates a circular airflow pattern and ensures no cold pockets. How is your bilge laid out - wide and open, or divided up around the engines?
    view full answer...
  • Which Winterizing Heater Will Keep 26' Pocket Cruise Boat Warm On The Slip In Winter?
    Dana, the Xtreme Heater 600w # XH77FR is a great fit for boats right in that 24–28 foot range. Since you’re in the water and not on a trailer, the hull helps hold warmth, so the 600W should give you plenty of protection. If you were storing on a lift, I’d suggest stepping up to the 800W # XH27FR or adding a second heater. Do you usually get heavy freezes in your area, or just the occasional cold snap?
    view full answer...
  • Which Heater Is Best For Keeping 32 Foot Houseboat From Freezing In Winter?
    Alan, the 800W heater from Xtreme # XH27FR is designed for boats up to about 35 feet, so a single unit can often cover a twin-engine cruiser if it’s well sealed. In bigger, packed compartments with pumps and plumbing, many owners place two heaters outboard of the engines to promote circular airflow. If your bilge has a lot of equipment crammed in, that dual setup may be more reliable. Do you store the boat in the water year-round or pull it out in winter? That can make a big difference...
    view full answer...
  • Will 800w Heater Work In RV Pass-Through Storage Bay To Keep Plumbing And Lithium Batteries Warm?
    Not overkill at all, Rachel. That’s exactly where the 800W heater # XH27FR shines - large, shared spaces where you’ve got both plumbing and batteries to protect. It cycles on at 40°F and off at 55°F, so it won’t waste energy heating beyond what’s needed. Just make sure the thermostat on the back has good airflow so it senses correctly. Is that bay insulated at all, or open to outside temps? That’ll help determine which heater you need.
    view full answer...
  • How Big Is The Xtreme Heaters RV Basement And Boat Bilge Heater For Tight Engine Compartment?
    Steve, the heater body of the # XH27FR is about 8” long, 5-1/8” tall, and 3-1/2” deep/wide. With the mounting feet, length is just over 9”, and with the quick-release bracket, add about another inch in overall length. The bracket itself is 10-7/8” long by 4-3/4” wide. It’s a compact footprint for the output, which makes it popular for cruisers and houseboats. Where in the compartment are you looking to place it - low and centered, or tucked outboard?
    view full answer...
  • What size breaker do I need to hard wire 800w Xtreme heater XH27FR for winterizing rv or boat?
    Mike, the 800W heater # XH27FR draws about 6.8 amps running, with a 13.5A inrush on startup. Xtreme recommends a 20A breaker for this model. If you’re wiring it into your breaker panel, give it its own dedicated circuit to avoid overloads. You can definitely just plug it into an outlet as is though. Are you planning to mount it permanently, or use the quick-release bracket for seasonal swaps?
    view full answer...
  • Which Heater Is Best For Winter Storage Of 30 Foot Cruiser Boat On Lift?
    John, lift-stored boats lose heat faster than those in the water, so you’re smart to ask. The 800W # XH27FR is the recommended size for 30–35’ boats, but in lift storage, many owners either add a second 400W # XH67FR or 600W # XH77FR heater or go with two 800W units if the compartment is large. You’ll also help it perform by covering vents and outdrives to cut cold airflow. Do you have access to shore power on your lift, or do you rely on a portable generator?
    view full answer...
  • Can A Space Heater Protect My RV Fresh And Gray Water Tanks ?
    Jennifer, the Xtreme heaters are built to protect enclosed compartments like pump bays, plumbing manifolds, and battery spaces -not the tanks themselves if they’re hanging exposed under the RV. Many travel trailers and fifth wheels have black and gray tanks suspended outside, and in that case you’d need tank heating pads instead of a compartment heater. If your rig has an enclosed underbelly where all the tanks and plumbing are together in one large cavity, then the 800W # XH27FR would...
    view full answer...
  • How To Prevent Bilge On Boat From Freezing During Winter When On Lift - 27' Sailboat
    Ken, boats on lifts lose heat faster since they don’t have the water’s thermal buffer. The 600W heater # XH77FR will help, but Xtreme suggests either going one size up the 800W # XH27FR or using two heaters if you’re lift-stored. You’ll also get better results if you cover vents or even the outdrive to reduce cold airflow. Do you have shore power at your dock, or would you be running off a generator?
    view full answer...

Do you have a question about this RV Heater?


Info for this part was:

Employee Mary K
Edited by:
Mary K
Employee Daron K
Updated by:
Daron K
Employee Alex H
Updated by:
Alex H
Employee Andy C
Installed by:
Andy C
Employee Lincoln B
Written by:
Lincoln B

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