Xtreme Heaters XSmall 250W Enclosure Heater

Xtreme Heaters 250w small space heater not for large compartments.

The Xtreme 250W XSMALL Enclosure Heater is built for small, enclosed spaces where you need dependable freeze protection but don’t have room for a larger heater. It’s an ideal solution for maintaining warmth in compact areas like jet ski compartments, small pump/water spaces, battery compartments, overlander van compartments, electronics cabinets, small generators, NEMA cabinet heater, and small air compressor enclosures, plus other tight compartments where critical equipment needs protection in harsh winter conditions.

This enclosed space heater is designed to protect equipment and lines in confined areas, not to heat large spaces. It’s also a great fit for bathrooms, under kitchen cabinets, freshwater lines, and around AC units where space is limited. Its compact footprint makes installation quick and simple, and versatile mounting options allow it to be positioned in nearly any orientation to make the most of tight installs.

If the space is open, drafty, or larger than a typical small compartment, step up to a higher-wattage model for reliable results. Important: The 250W XSMALL is not intended for engine rooms—it’s purpose-built for small, hard-to-reach compartments that need consistent freeze prevention.

 Features

• True Forced Air Heating circulates air more effectively and heats more evenly for more accurate temperature control.
• Mounting orientation flexibility: Horizontal or vertical installation supported, even upside down.
• Automatic Thermostat turns the heater on at 40°F and off at 55°F (+/- 3°F) for tight, reliable control.
• Fail-safe PTC technology: Self-regulating heating design helps prevent overheating and supports continuous-duty operation in unattended enclosures when installed per instructions.
• High Efficiency produces heat faster, circulates more air, and shuts off earlier to save energy.
• Pre-wired 6 ft marine-rated power cord with a 110V 3-prong plug for plug-and-play installation. No hardwiring required.
• Maximum Life: Designed for durability and reliability in harsh environments.
• Corrosion protection: Fully anodized inside and out to resist corrosion in wet and salt-air conditions.
• Mounting hardware included: Stainless Phillips head screws.
• Energy note: thermostatically controlled can reduce energy use up to 75% compared to continuous-run heaters.
• Certified and independently tested.
• IP68 rated: The assembly is sealed for rugged use—resists dust and moisture exposure in dirty, damp conditions and handles wet, harsh environments without failing.
• Ignition protected: Tested to U.S. Coast Guard standards (USCG 33 CFR 183.410) and SAE J1171.
• Mil-Spec tested: MIL-STD-810E Method 514.4 for vibration, humidity, and high/low temperatures.
• 5-year warranty (best in the business), backed by U.S.-based support.
• Built to Meet ASSE-1060 Requirements

Use cases.

      •    Air compressor enclosures / compressor enclosures
•    Boat and RV Battery Compartments
•    Battery charging lockers / lithium battery enclosures (solar shacks, sheds)
•    Small generator enclosures
•    Under-cabinet spaces (bathrooms, kitchens, ice maker/fridge water line areas)
•    Overlander vans and small utility compartments
•    Service truck / work vehicle small utility bays and toolbox-style compartments
•    NEMA electrical cabinets and outdoor control panels
•    Electronics cabinets / small control boxes
•    Remote monitoring / sensor enclosures (telemetry / SCADA boxes)
•    Security system enclosures, gate controls, and access control boxes
•    Parking gate operator cabinets and access pedestals
•    Telecom / internet / fiber demarcation cabinets (outdoor comms boxes)
•    CCTV/DVR/NVR cabinets in garages, sheds, or outbuildings
•    Sprinkler controls and fire suppression-related enclosures
•    Irrigation valve boxes / manifold boxes (enclosed)
•    Pool automation / timer control boxes (enclosed panels)
•    Small pump / water system spaces
•    Well pressure tank compartments in small pump sheds (tight areas)
•    RV wet bay micro-compartments (valves, P-traps, short runs of line)
•    Freshwater inlet / city-water connection compartments
•    Exterior shower compartments (box + valve)
•    Water filter / softener enclosures (RV, cabin, tiny home)

As product and industry experts, our goal for the Xtreme Heater was to produce a highly safe, dependable, and efficient option on the market. 

SHOP SMALL HEATER HERE (Boats 24′ Length)

SHOP MEDIUM HEATER HERE (Boats 28′ Length)

SHOP LARGE HEATER HERE (Boats 35′ Length)

Owners manual click here 

Specifications 

• Wattage: 250W
• BTU: 853
• Inrush (startup) current: 4.4 A, 1 sec.
• Typical operating current: 2.2A
• Fan flow 34CFM
• 68 Db 
• IP68 (Waterproof) rated Fan
• MTBF for fan: 50,000
• Heater Dimensions: 5.75” x 2.87” x 3.82
• Box packaged Dimensions 8” x 4.6” x 4”
• Fuse or breaker size required 10A
• 6ft marine rated power cord
• UPC-00895670001439

Because compartments 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 compartment, more than one heater may be necessary to ensure adequate protection. The compact size and efficient performance of Xtreme Heaters make them a perfect choice for these smaller spaces.