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This 35,000 Btu furnace delivers steady ducted heat for larger RVs, while Soft Start technology helps reduce startup strain on your electrical system. The airflow design helps warm your rig faster on cold mornings. Access door included.
When temperatures drop, a small furnace can leave parts of your RV feeling like a different climate zone. This 35,000 Btu unit is sized for larger rigs that need steady, consistent heat across the whole space. A common guideline is about 1,000 Btu per foot of RV length, making this a solid match for RVs up to about 35' long.
Bigger is not always better when it comes to RV furnaces. An oversized furnace can cycle more often than necessary, use more propane, and create uneven temperatures throughout your RV. Matching furnace output to the size of your rig helps maintain more consistent comfort without overworking the system.
Standard ducted RV heating systems make this a practical replacement for many factory-installed furnaces. It supports horizontal or vertical installation, but alignment still matters. Checking dimensions, duct connections, and vent orientation before ordering helps avoid fit issues during installation.
Most furnace returns come down to fit, not performance. Before ordering, compare the dimensions, duct locations, vent orientation, and door setup with your existing unit. Taking a few measurements upfront helps avoid getting halfway through installation and realizing something is just off enough to stop progress.
Starting a furnace pulls a quick surge of power, which can stress older electrical systems or drain batteries faster when you are off-grid. This can cause voltage drops, dim lights, or even trip fuses. Built-in Soft Start reduces in-rush current by up to 80%, helping startup stay more controlled and reducing strain on your battery and wiring.
This furnace delivers 18% to 22% more airflow than a leading competitor in ducted applications. The one-piece tubular heat exchanger and internal baffle system help push warm air more evenly through your RV so you are not dealing with one warm corner and another that never quite catches up.
A patent-pending Hall Effect Sensor removes moving parts from the ignition system, reducing common wear points and helping support more reliable operation over time. That means fewer components to fail when temperatures drop and you need heat to work the first time without troubleshooting.
This kit includes the compatible black exterior access door along with the furnace, making it a good fit for installations that require exterior access. If you prefer a white access door instead, check out DMC47SR. Having exterior access makes future maintenance and service easier because the furnace can be reached from outside the RV instead of removing interior panels or cabinetry. This type of setup is often the better fit when the furnace is installed in a harder-to-reach location inside the RV. The removable exterior access panel also simplifies inspections, troubleshooting, and repairs down the road.
Doorless setups create a cleaner exterior appearance because there is no access panel on the outside of your RV, and they eliminate another exterior seal that could eventually require maintenance or resealing. If your setup provides easy access on the interior of your RV, and you'd rather have a cleaner exterior appearance without an exterior access panel, check out the true doorless version, DMC74MR.
A compatible thermostat is required to control the system and is sold separately.
Warm air moves through your RV's duct system for full interior coverage, helping maintain more consistent temperatures across multiple areas of your rig. Ductless heaters are often used for smaller spaces or targeted warmth, but a ducted furnace like this is better suited for maintaining consistent heat across multiple areas of your RV.
Confirm furnace dimensions, duct layout, vent orientation, access door requirements, and thermostat compatibility before ordering.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everyone. Steven here with etrailer.com. Let's take a look at our Dometic RV LP gas furnace, rated at 35,000 BTUs of power, runs on 12 volts, and has a nice black door included. So folks, I do wanna start off with this statement. This again is the black door option. We do carry this in a white door option as well.
So if you want a different color, we have white available separately. It's item number DMC47SR. Again, the complete kit with the white door is DMC47SR. So this is the black door again that we're looking at today obviously. Now, this has been sized for RVs about up to 35 feet.
Again, 35,000 BTUs of powerful heat. It's gonna keep your rig warm off-season, and if you're just replacing one or you're starting from scratch, this is a great option. No short power needed, right So it runs on LP gas, 12 volts of power. So you got your wires here for hooking up to 12 volts. Your LP hookup is underneath this cover here, and you have a safety red threat protector over the LP hookup down inside of there as well.
So again, you're set for off-grid with this. It does have quiet, reliable starts. I will go ahead and spin it around. And while I'm doing that, you can notice these two pop outs, two on top, three in the back, and two more on the opposite side. And they give you four of these adapters for those pop outs to go to your duct work included.
Now as you can see, I don't have this door properly installed, I just have it kind of loosely fitted here. So bear with me on the look. But it does come with the screws, the hardware to mount the door, and to mount that heat exchange cap there, if you will, as well. So all those screws do come with it, I just didn't put them in there for the display today. Taking a look at the inside, as you notice, it's now changed direction. So you can install this horizontal or vertically per the instructions, just depends on your space and your setup. But I wanted to show you this so you can see, number one, the advanced air baffle systems starting at the top there, it's gonna give you about 22% more on average airflow, giving you faster heat distribution in your unit. It has a built-in hall effect sensor, and it uses soft start technology. So it's gonna reduce that in rush current, and you're not gonna have those large jolts and loud power or loud jolts or power spikes. And then of course, the one piece tubular heat exchange at the back there, it's all curved and it does a great job delivering more efficient heat through the whole unit and then out into your camper, RV, or whatnot. So again, folks, it does have the nice black door on this particular unit. And again, everything would be screwed in. This would be screwed in. Then of course your door would be screwed in. And this is a two piece door. You have your flange and then you have the metal door with the insulation and everything on there. So from here you can see the reset button, on, off. And then of course your heat exchange tube coming out here. And then of course your blower and everything's built back inside there and everything. So just wanted to show you a quick look on the inside as much as I could. Overall, some dimensions, as it's laying down this way, I got 20 inches, I'm sorry, 17 inches long this way, 7 inches tall, and 20 inches deep. So again, folks, this is the black door option. We do carry it in white, again, sold separately. Again, this is the Dometic RV LP gas furnace rated at 35,000 BTUs of power running on 12 volts. I'm Steven. Thanks for watching.
Ratings & Reviews
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Heather A.
4/11/2026
Thanks for sharing that, and I’m sorry you’re dealing with that right out of the box. That definitely doesn’t sound normal. You’ll usually hear the fan spin up and a click when it ignites, but grinding isn’t something you should be hearing. That does point toward an issue with the blower or motor. Before running it much more, it might be worth double checking that nothing shifted during shipping or install, like a loose housing or something contacting the fan. If everything looks good and the noise is still there, this is something we’d want to take care of for you. If you can, a quick video of the noise would really help us confirm what’s going on and get you taken care of as quickly as possible