Recreational Vans
A ventless propane heater burns propane and releases the heat into the room along with water vapor and trace combustion gases. Because there is no flue, the unit keeps most of the heat inside, which is why many models list efficiencies near full. That number reflects how much heat stays indoors, not necessarily how clean the air remains over time. Indoor certified models include an oxygen depletion sensor that shuts off the burner if oxygen dips below a safe threshold. You still need fresh air, especially in compact rooms, because the heater consumes oxygen while adding moisture.
Ventless units typically use two styles of heat. Radiant panels warm people and objects directly, which feels instant on a cold morning. Blue flame convection warms the air and then the space gradually. Both styles can be thermostat controlled and many support low oxygen shutoff, tip switch protection, and pilot safety valves. A label stating indoor safe and compliance with ANSI standards is a must for enclosed spaces.
Radiant panels deliver spot warmth that is noticeable even if the air temperature is still climbing. Blue flame heaters feel more uniform once the air mass has warmed for a few minutes. In rooms with insulation and good air mixing, blue flame can feel more even. In drafty corners, radiant can be the faster comfort fix.
Propane contains about 91,500 BTU per gallon. A heater set to 10,000 BTU per hour will draw roughly 0.11 gallons an hour, so a 20 pound cylinder can deliver many hours of low setting heat. Real world runtime changes with altitude, thermostat cycling, and how often you let in fresh air.
Propane combustion produces water vapor. In cold weather the added moisture will condense on windows and cold metal, which can lead to damp bedding and surface rust. Crack a window and circulate air with a quiet fan to control condensation, and keep absorbent items away from cold walls.
Choose BTU output based on volume, insulation, expected outside temperature, and air exchange. Oversizing can cause rapid cycling and excess humidity, while undersizing leaves you cold. A rough starting point is 20 to 40 BTU per square foot for poorly insulated envelopes in freezing weather, then adjust downward for tighter builds. Manufacturers publish altitude limits because thin air lowers combustion quality. Many ventless heaters are rated below about 4500 to 5500 feet where oxygen is higher.
Clearances matter. Keep fabric, cabinetry, and plastics outside the manufacturer listed distances on sides, back, and in front of the face. In compact rooms, aim the heater toward open air rather than directly at a cushion or wall panel. Do not block grills or louvers and do not operate in sleeping areas without fresh air and functioning detectors.
Fresh air is not optional. Ventless does not mean sealed. Crack a window, open a roof vent, or use an intake setting on a fan to maintain air quality. A small continuous fan helps move warm air off the ceiling and across the room which improves comfort and reduces condensation on windows.
If you often travel above mountain elevations, confirm the unit’s altitude rating before purchase. At higher elevations, combustion can become unstable and the oxygen depletion sensor may trip more often. A slightly lower BTU unit that burns clean can outperform a larger model that struggles with thin air.
Wall mounting reduces tip hazards and improves airflow across the heat source. Floor units must sit on a stable, non combustible surface. Plan the furniture layout so walkways do not pass directly in front of the heater face.
Use moisture tolerant materials near the heater such as metal trim rings or ceramic tile. Keep soft goods clear and dry. A roof fan set on low intake can bring in fresh air while the heater runs, then switch to exhaust for a quick moisture purge after cooking or showers.
Even with an oxygen depletion sensor, a ventless propane heater requires layered safety. Install both a carbon monoxide detector and a propane leak detector at the proper heights. Test them regularly and replace sensors on the schedule recommended by the manufacturer. Never store loose cylinders indoors. Use a certified hose or hardline with a regulator that matches the appliance, and check fittings with an approved leak solution.
Local building or fire codes may restrict or prohibit ventless heaters in certain residences, sleeping rooms, or tiny structures. Some campgrounds and insurance policies also have rules about unvented combustion inside RVs or vans. In very tight envelopes, a sealed combustion furnace or diesel air heater can be a better fit because intake and exhaust move outdoors.
Ventless heaters also raise indoor nitrogen dioxide. Sensitive individuals may notice irritation in poorly ventilated rooms. Good airflow, clean combustion, and correct sizing help manage this, but if you have respiratory concerns, consider a vented system.
An oxygen depletion sensor is the minimum. Add a quality carbon monoxide detector and a propane detector for a complete safety net. Test alarms monthly and replace units at end of life.
Run a fan, wipe window frames, and give the space a daily dry out. Manage humidity under 50 percent when possible. Desiccant packs in storage lockers help keep gear dry.
If you sleep in a tiny, airtight shell or winter at high altitude, a sealed combustion furnace is often the wiser choice. It draws outside air for burn and sends exhaust out, keeping indoor air cleaner while still delivering strong heat.
Now, if you want heat that plays nicely with power, storage, airflow, and safety systems, bring in a professional team. OZK Customs designs and integrates heating that matches your travel style and climate targets, from certified ventless options with proper air exchange to sealed combustion systems for high mountain seasons. Explore our recreational van builds to see how complete heating strategies fit into real world layouts, power systems, and ventilation.
We partner with clients who want a purpose built interior rather than a generic heater dropped into a box. Learn more about our custom van build process where heat, airflow, and safety work as one plan. If you prefer a finance friendly path, review our mainstream vans that start with proven platforms and upgrade paths.
Strong heating is only one part of a reliable adventure rig. We bring the rest together with smart ventilation, sealed storage for cylinders when applicable, and controls that keep nights comfortable and safe. Tell us where you travel and we will tune the system for clean combustion, quiet fans, and easy upkeep.
Warmth should come with confidence. Share a few details about your travel season and cabin size, and OZK Customs will recommend a heating solution that respects air quality and code requirements while delivering quiet, even heat. Start a conversation today and we will turn your wish list into a plan that is safe, efficient, and ready for the road.
Ready to heat your rig safely and efficiently? Talk with OZK Customs about a professionally designed system that balances comfort, airflow, and compliance. Share your travel style, we will spec the right heater and integrate power, ventilation, and controls. Fill out the form and let us build a warm, worry free setup.
ADDRESS:
6159 E Huntsville Rd, Fayetteville, AR 72701
PHONE:
(479) 326-9200
EMAIL:
info@ozkvans.com