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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.
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.
This unit is designed to work within standard ducted RV heating systems, making it 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.
Choosing between a furnace with an exterior access door and a door-compatible setup depends on how your RV is configured. Doorless setups create a cleaner exterior appearance because there is no large access panel on the outside of the RV. They also eliminate another exterior seal that could eventually require maintenance or resealing.
The tradeoff is service access. Doorless furnaces must be accessed from inside the RV for maintenance or repairs, so they work best when the furnace is installed in a location that is reasonably accessible from the interior. If your furnace will be difficult to reach from inside the RV, adding an exterior access door can make future service much easier. So, if an exterior access door sounds like the right option for you, you can get this same furnace with a black access door included, DMC67SR. For a white access door, check out DMC47SR.
If you are replacing an existing unit, you may also be able to reuse your current door depending on its condition and fit. A compatible thermostat is required to control the system.
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
Customer Satisfaction Score:
88% were satisfied with this product
12% of customers were not satisfied
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Condition: Badly Dinged
Notes: The frame is bent and dented. Otherwise, new and unused. All hardware is included.
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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