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The Rinnai EX38DTP takes the top spot because it runs on a modulating burner that adjusts flame height in tiny increments rather than cycling on and off. That means the room temperature stays within a degree of your set point, and you never get the blast of hot or cold that simpler thermostats produce. The 36,500 BTU output handles up to 1,600 square feet, making it a legitimate whole-home heater if you zone your house properly.

The wall furnace uses forced air but with a quiet fan that doesn’t rattle like a unit heater—owners report the existing Monitor GF500 sounds like a jet engine in comparison. The self-diagnostic electronics flag ignition or sensor problems before they leave you cold, and the cool-to-the-touch cabinet makes it safe for high-traffic areas. The beige finish blends into most walls better than the gray industrial look of garage heaters.

Installation is not a weekend DIY job for most people because the gas line and vent pipe require precise sizing. The unit weighs 108 pounds and needs at least two people to hang securely. Owners who bought the optional wall thermostat kit say it integrates seamlessly with smart systems like NEST, giving you scheduling and remote temperature control from your phone.

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The EX22DTP uses the same modulating technology as the larger EX38 but with a lower BTU ceiling of 20,700, making it a better fit for a single bedroom, a small apartment, or a 240-square-foot addition. Owners who upgraded from a vented log stove say the Rinnai eliminates the hot-and-cold swings thanks to the modulating valve that matches output to heat loss in real time.

Safety is a standout here: the sealed burn system draws combustion air from outside, so the heater doesn’t compete with your home’s oxygen. The cabinet stays cool to the touch even during extended operation, which matters if the unit is mounted near furniture or in a child’s room. The built-in pressure regulator stops gas flow immediately if the pilot goes out.

One recurring note from buyers is that this model comes only with the shortest vent option—if your exterior wall is thicker than about six inches, you’ll need to order the vent extension separately. Several owners recommend hiring an HVAC technician for the gas hookup because the piping needs specific sizing to avoid pressure drops. The Wi-Fi compatibility with smart thermostats was a deciding factor for users who wanted scheduling capability.

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The Modine Hot Dawg HD45 is the gold standard for direct-vent garage heating because it combines a sealed combustion chamber with a powerful forced-air blower in a compact 12-inch-deep housing. The 45,000 BTU output heats a two-car insulated garage to 60 degrees in about fifteen minutes, even when outside temperatures drop into the teens. Owners praise the small footprint—it tucks up near the ceiling and stays out of the way of vehicles and workbenches.

Build quality is what you pay for here. The stainless steel burner and aluminized steel heat exchanger resist corrosion from propane combustion byproducts better than the painted steel used in entry-level units. The direct-vent design uses a coaxial pipe that brings in combustion air through the outer ring and exhausts through the inner tube, so there’s no need for a separate air intake across the room.

The installation instructions are clear, but the gas line and venting still require a professional unless you’re experienced with black iron pipe and LP regulators. Some buyers note that the 45k BTU rating is optimistic for uninsulated spaces—if your shop has no insulation, you may need the 75k BTU version to hold temperature on the coldest days. The warranty covers the heat exchanger for ten years and parts for five.

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The Mr. Heater MHU80LP is the big gun of this lineup: 80,000 BTU of forced-air output that can bring a 30-by-24-foot uninsulated garage from freezing to comfortable in minutes. The spark ignition system includes a self-diagnostic control module that reads sensor voltages and reports error codes, so you’re not guessing why the heater won’t light. This is a unit heater designed for ceiling mounting, with angle brackets included in the box.

The heat exchanger and burner assembly are built for continuous duty in commercial-style settings—construction sites, farm shops, and auto repair bays are its natural habitat. Owners report that it uses less propane than the older unit it replaced, which suggests the burner efficiency is solid even at this high output. The 4-inch flue size matches standard direct-vent pipe, and the ½-inch gas connection requires a propane regulator rated for the full 80k BTU draw.

Quality control has been inconsistent. One buyer received a unit with loose fasteners inside the blower housing and a gap in the exhaust duct that could have leaked carbon monoxide. The included warranty covers the heat exchanger for ten years and other parts for three, but the shipping damage reports mean you should inspect every weld and screw before hanging it. This is a fantastic heater if you get a clean unit, but check it carefully on arrival.

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The Comfort Glow 17,000 BTU heater offers a clean, space-saving profile at a mid-range price point that undercuts the Rinnai and Ashley premium models. It uses an electronic ignition—no standing pilot, so it only burns propane when the thermostat calls for heat. The sealed burn system and built-in pressure regulator meet the safety requirements for bedrooms, bathrooms, and HUD-certified housing, which is a big deal for mobile home owners.

The heating method is convection, which means it relies on natural air movement rather than a blower. That makes it whisper-quiet—no fan noise at all—but it also means heat distribution is slower and less even than forced-air models. For a 500-square-foot living room or bedroom, that’s fine; for an open-concept garage, you’ll feel the temperature drop as you move away from the unit. The included vent kit fits walls between 4.5 and 10 inches thick.

Buyers note that the packaging could be better—the unit arrived with a dented carton in several cases, though the heater itself was undamaged. The two-year manufacturer warranty is shorter than the five- and ten-year coverage from Ashley and Modine. If you’re installing this in a guest room or a tiny house where noise is the main concern, the convection silence is worth the trade-off in heating speed.

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The DVAG11L is the smallest direct-vent heater in this guide, rated at 11,000 BTU for a 375-square-foot room. That makes it a perfect candidate for a small bedroom, a home office, or an insulated sunroom where you don’t want to overheat the space. The safety pilot and built-in pressure regulator completely stop gas flow if the pilot light goes out, which buyers say is reassuring for use in rooms where the heater might be left unattended.

Construction is straightforward: a 430 stainless steel ported burner that produces almost no sound during operation. Owners who replaced a drafty old Williams wall heater say the Ashley unit holds its pilot light even in windy conditions—the direct-vent pipe is sealed well enough that gusts don’t extinguish the flame. The 41.7-pound weight is manageable for a two-person wall mount, and the depth is only 6.75 inches, so it doesn’t protrude far into the room.

One drawback is the Piezo ignitor: several buyers report that the push-button sparker is hard on the fingers and sometimes fails to light the pilot on the first twenty attempts. Priming the gas line by holding the pilot button for a full minute before clicking the ignitor usually fixes the issue. Also, the unit comes as a natural gas model by default—check that you’re ordering the propane-specific version if you don’t have a gas line.

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The DVAG17 steps up to 17,000 BTU while keeping the same direct-vent wall furnace form factor as the smaller DVAG11L. It covers up to 570 square feet, which is enough for a large living room or a master bedroom suite. The included vent kit—heat shield, pipe, flashing, cap, and connecting rod—means you don’t have to source separate components, saving a trip to the hardware store.

The sealed burn system with matchless Piezo ignition is the same design as the smaller model, so you get the same safety pilot and pressure regulator. Owners of uninsulated cabins say the DVAG17 holds 60 degrees in a 20-by-30-foot space when outside temps are in the teens, though the BTU rating feels slightly optimistic—it runs near its maximum setting most of the day. The cream color blends in well with off-white walls, and the 6.75-inch depth keeps it from protruding into walkways.

Quality control is the main concern here. Several buyers reported broken ignitor ceramics that were overtightened at the factory, and one unit arrived with bent parts that required straightening before installation. The customer service team at Ashley Hearth has a mixed reputation—some owners got replacement parts quickly, while others waited weeks for a response. If you get a clean unit, the heat output and quiet operation are excellent for the price.

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The Gasland MHA18BN is a cabinet-style radiant heater that runs on a standard 20-pound propane tank without any electrical hookup—no outlet needed. It delivers 18,000 BTU to a 450-square-foot area, making it suitable for a garage, workshop, or construction site where you want portability over permanent installation. The built-in wheels and carry handle let you move it between rooms or load it into a truck.

Because this is a radiant heater, it heats objects and people directly rather than warming the air. That works well in a drafty garage where forcing air movement isn’t practical, but it means you feel the heat only if you’re in the line of sight of the burner. The three heat settings (high, medium, low) give you some flexibility, and the tip-over and low-oxygen shut-off sensors are a welcome safety addition for a floor-mounted unit.

Owners report that the heater is very effective for its price, with many noting that it keeps a 33-foot travel trailer warm even in cold weather. The tank enclosure hides the propane cylinder visually, which improves the look compared to a bare tank sitting on the floor. The downsides are that the heater consumes oxygen from the room (it is not sealed combustion) and the instructions recommend keeping a window cracked for ventilation whenever it is running.