When it comes to upgrading or replacing the water heater in your RV, two brands consistently stand out: Suburban and Dometic.
Both have earned solid reputations among RV owners and technicians for producing reliable, efficient water heaters tailored to mobile living.
Having worked as an RV technician and installer for over a decade, I’ve installed and serviced countless water heaters from both brands. Today, I want to share my hands-on experience and insights to help you make an informed choice between the Suburban Direct Spark Ignition Water Heater and the Dometic Atwood Direct Spark Ignition Water Heater.
This comparison guide will dive deep into how these water heaters perform, their reliability over time, key features, and what to expect during installation and maintenance.
If you’ve been hesitating between these two or just want to understand what sets them apart, you’re in the right place.
If you’re like me, a warm shower after a long day on the road isn’t just a luxury—it’s a necessity. A dependable water heater can seriously enhance your travel experience and keep you comfortable in any weather condition.
However, not all RV water heaters are created equal. You might think, “It’s just a water heater, right?”—but factors like ignition type, heating capacity, energy efficiency, and ease of repair can dramatically affect your experience down the road.
When I’m helping customers upgrade their water heaters, common concerns include:
With these questions in mind, I always recommend checking out models with direct spark ignition systems. That’s why the Suburban and Dometic models I’ll discuss here fit the bill—they feature modern ignition tech designed specifically for RV use.
Before we get into specifics, let’s quickly introduce our two main players.
Suburban’s name is practically synonymous with RV water heating. This 6-gallon model features a direct spark ignition (DSI), which replaces the older and less reliable pilot light systems. That alone is a huge perk for RVers who want hassle-free start-ups, especially in colder weather.
Suburban has built their reputation on rugged, no-nonsense designs that hold up under tough travel conditions. Their DSI system is well-engineered to provide swift ignition while minimizing propane consumption, crucial for prolonged trips off the grid.
Dometic acquired Atwood a few years ago and has since been blending Atwood’s legendary designs with Dometic’s efficiency-focused engineering. Their 6-gallon DSI water heater brings improved ignition reliability and user-friendly controls, designed for easy installation and maintenance.
Dometic has pushed the envelope by incorporating more advanced thermostat technology and modular components, making it easier for savvy owners to perform upgrades or repairs without a full teardown.
Let’s break down how these units stack up in the most important areas.
Both models employ Direct Spark Ignition systems. From a technician’s perspective, direct spark ignition is a vast improvement over old pilot light starters. It ignites the burner immediately via an electric spark, minimizing gas waste and eliminating the pilot outage frustrations common on older models.
Why does this matter?
Imagine arriving at a chilly campsite after a long drive, eager for a hot shower, only to find your water heater won’t light because the pilot went out or the ignition failed. This common frustration is nearly eliminated by direct spark ignition.
Between the two, Suburban’s DSI system has a slight edge in my experience. I’ve found it tends to ignite more consistently in colder weather or with marginal propane pressure. This robustness is a huge plus for those camping in remote or extreme environments where propane supply can fluctuate.
That said, Dometic’s system is no slouch—it's close on reliability and generally dependable within standard RV operating conditions. The electronic ignition module works smoothly and benefits from Dometic’s ongoing firmware and hardware improvements.
If you often camp in extreme environments—say, at high altitudes or below freezing temperatures—Suburban's ignition system might be the better bet.
Given the critical role ignition plays, I always advise testing your water heater ignition under your typical camping conditions before relying solely on it. It's surprising how conditions like high altitude, cold temps, or low propane levels can affect ignition success.
Both water heaters store 6 gallons, which is ideal for a range of RV sizes from mid-sized travel trailers to Class C motorhomes.
But how quickly they heat up the water and maintain temperature can vary, and here the differences are subtle but impactful.
Suburban’s burner outputs about 10,000 BTUs, efficiently heating water in roughly 30-40 minutes under normal operating conditions. It maintains a consistent water temperature well, thanks to a solid thermostat design. The even heat distribution inside the tank also helps eliminate cold spots, so your shower won’t suddenly go cold midway.
Dometic Atwood’s burner is similarly rated, with minor differences in burner design that can affect heat distribution. Some RV owners notice slightly faster recovery times with the Dometic, as well as a more responsive thermostat that can make temperature tweaking feel smoother. This can be especially appreciated in family or group camping situations where multiple hot water uses happen in quick succession.
Still, both units perform comparably well for typical RV needs. I would say that the Dometic may edge out Suburban in recovery speed while Suburban might deliver slightly steadier temperature control during extended use.
In practical terms, if you’re an RV host or someone who likes to take frequent showers or wash dishes back-to-back, the Dometic’s faster hot water recovery might be noticeable. On the other hand, for solo travelers or couples who spread out their water use, the Suburban’s steadiness is more than sufficient.
When inspecting these units physically, you quickly notice the care in material selection both manufacturers employ.
Suburban water heaters wear their rugged, industrial design with pride. Their tanks employ high-quality steel with glass-lined interiors resistant to corrosion. In my years of service, I’ve rarely seen internal rust or tank failure in Suburban heaters unless the units weren’t winterized properly. The external casing is built to withstand vibrations and bumps common in the RV environment without dents or cracks.
Dometic’s Atwood water heater uses similar materials, also featuring corrosion-resistant tanks and durable external housing. Its components tend to be modular in design, which is great for DIY repairs or part swaps. The modular approach means if the thermostat or ignition module fails, you can often replace just that part without disturbing the tank or other components.
From a hands-on maintenance standpoint, I slightly prefer Suburban for long-term durability, but Dometic scores points for accessibility and ease of part replacement.
Years back, I serviced a Dometic unit where the thermostat had stopped regulating correctly. Thanks to the modular design, the owner replaced just that component quickly, avoiding costly downtime. With Suburban, while the units are durable, some parts require more disassembly, making them better suited for those confident in their mechanical skills.
If you’re swapping out an old water heater, installation hassle can be a real headache.
Both Suburban and Dometic models are designed as drop-in replacements for the standard RV water heater compartment, and the 6-gallon size fits most popular floor plans.
Suburban’s design places the gas and water connections in standard positions, making it easier for installers who are upgrading from older models. The wiring and venting requirements are fairly straightforward, reducing installation time and potential mis-wiring.
Dometic’s unit sometimes requires extra attention during venting installation because of its slightly different heat exchanger layout. That means you may need some patience or additional materials like vent adapters or repositioning brackets.
If that’s your first time removing or replacing a water heater, Suburban might be easier to work with—trust me, the last thing you want is extra fiddling after a hot day of traveling.
Both models support 12V DC operation and propane with electronic ignition, so they fit seamlessly into your RV’s systems.
Additionally, both models comply with RV industry standards such as ANSI Z21.10.1 and CSA approval, meaning they’ve undergone rigorous safety testing — important peace-of-mind when dealing with propane and electrical components in cramped spaces.
For DIY installers, the inclusion of clear wiring diagrams and connector types varies slightly. Dometic tends to offer more detailed manuals with step-by-step instructions, while Suburban’s documentation is straightforward but sometimes assumes basic familiarity.
Modern direct spark ignition water heaters are more energy-conscious than their pilot light predecessors. Because the burner only fires when needed, gas consumption usually drops noticeably.
Suburban’s 6-gallon water heater integrates energy-saving features and offers efficient propane burner performance with minimal pilot gas use. This directly translates to longer propane tank life on road trips, an important advantage when boondocking.
Dometic’s Atwood model is comparable in efficiency and includes an improved thermostat to prevent overheating, which can save fuel over time. It also features a temperature lockout mechanism that protects against accidental overheating, reducing wastage of propane and increasing safety.
From my experience, both heaters will save you money compared to older, pilot-lit setups—but neither will revolutionize your propane usage dramatically over the other.
It’s worth noting that external factors such as insulation around the water heater compartment, the quality of your RV’s water lines, and ambient temperature will significantly impact overall energy efficiency as well.
Adding insulation blankets or heat shields to your water heater compartment can improve heat retention, allowing these heaters to operate more efficiently regardless of brand.
This is where real-world experience counts the most.
Suburban water heaters have fewer electronics involved, so they can be easier to troubleshoot if things go wrong. The direct spark ignition module isn’t complicated, and replacement parts like thermocouples, anode rods, and thermostats are widely available.
When diagnosing a Suburban water heater that won’t ignite, I typically start by checking propane flow, ignition spark presence, and thermocouple voltage—all simple tests with a multimeter and visual inspection. Many failures come down to dirt buildup or loose wiring, fixable with basic tools.
Dometic's Atwood series is a little more complex, incorporating newer circuit boards and sensor technology. This can sometimes lead to more diagnostic steps during troubleshooting. However, Dometic’s parts and technical support are outstanding and well-documented.
For example, if your Dometic heater experiences an intermittent ignition failure, the integrated diagnostics via LED indicators or error codes can guide you more precisely, reducing guesswork.
In practice, if you value simplicity and fast repair, Suburban may save you time on service calls. If you appreciate high-tech features and manufacturer-backed guides, Dometic is a solid contender.
Regardless of the unit you choose, these steps will help you address the most frequent issues:
Remember, proper winterization before long storage periods extends heater life dramatically. Both Suburban and Dometic recommend draining the tank and adding RV antifreeze if freezing temperatures are expected.
One of my regular customers was battling an older water heater on their travel trailer that kept failing in cold weather. After swapping in the Suburban Direct Spark Ignition unit, their hot water reliability skyrocketed. They told me one night camping in the Rockies, the DSI kicked in perfectly despite propane pressure issues. That peace of mind made the whole trip more enjoyable.
Another client, who frequently boondocks in desert areas, chose the Suburban for its simpler electrical design, minimizing failures in dusty environments. They reported zero ignition issues even with long power outages and multiple off-grid stays.
On the other hand, I installed the Dometic Atwood unit in a Class C motorhome last summer for a client who prized quick recovery when running multiple taps. They appreciated the noticeably faster hot water availability after showers. After six months of use, the client reported zero ignition issues—even after long storage periods. They also took comfort in the clear diagnostics when their unit unexpectedly shut down during a trip.
In another case, a Dometic owner found replacing the thermostat straightforward thanks to the modular design. They performed the repair themselves in about 45 minutes without calling in a technician—a testament to Dometic’s user-friendly design.
These stories highlight the key strengths: Suburban for rock-solid reliability in tough conditions, and Dometic for smooth, efficient performance with a few extra bells and whistles.
Suburban Direct Spark Ignition Water Heater (6 Gallon)
Dometic Atwood Direct Spark Ignition Water Heater (6 Gallon)
If I had to summarize in straightforward terms:
Both units represent decades of industry expertise and live up to their reputations. The best choice ultimately depends on your specific use case and comfort level with maintenance.
Upgrading your RV water heater is a smart move for comfort and convenience. Between the Suburban Direct Spark Ignition Water Heater and the Dometic Atwood Direct Spark Ignition Water Heater, you’re getting two of the best 6-gallon units on the market.
When I’m working in the field, I always remind clients that no single appliance is perfect for everyone. Your local climate, your RV layout, how often you use hot water, and your own maintenance preferences play a big role in picking a winner.
Personally, I keep a few Suburban units in stock for typical installs and reliable customer fixes, but the Dometic Atwood gets my vote for tech-savvy owners wanting that little extra speed and control. Either way, upgrading to direct spark ignition technology means fewer hassles and better hot water for all your adventures.
Make sure to pair your new water heater with proper winterization practices and routine maintenance to extend service life. Checking anode rods, flushing the tank yearly, and monitoring ignition behavior ensures reliable hot water for years to come.
Happy travels!
Q: What does Direct Spark Ignition mean and why is it better?
A: Direct Spark Ignition (DSI) uses electrical sparks to ignite the propane burner directly, eliminating the pilot light. This increases ignition reliability, reduces propane waste, and ensures quicker start-ups—important factors for RV living. Unlike a pilot light that needs to stay lit continuously, DSI fires only when heating water, saving fuel and reducing maintenance issues.
Q: Can I install these water heaters myself?
A: If you’re comfortable with basic plumbing and electrical work, yes. Both models are designed as drop-in replacements with standard connections. However, if you’re not confident, having a professional install or at least inspect is a good idea. Proper venting and propane connections are critical for safety, so don’t hesitate to seek expert help.
Q: How long do these water heaters typically last?
A: Expect around 8 to 12 years with proper maintenance, including winterization and anode rod replacement to prevent corrosion. Neglecting routine upkeep, especially in freezing climates, may shorten lifespan substantially.
Q: Are parts and accessories easy to find?
A: Yes, both Suburban and Dometic have well-established parts networks. Suburban parts tend to be more widely available and a bit simpler, while Dometic offers comprehensive support for their newer, more modular design. Both brands have authorized dealers and online stores, making sourcing parts straightforward.
Q: Which is more energy-efficient?
A: Both are similarly efficient due to the direct spark ignition system. You’ll see more energy savings upgrading from an old pilot light water heater than choosing between these two. Pair either with good insulation and efficient water use habits to maximize efficiency.
Q: Can these heaters run on electric only?
A: These specific models are propane-based with electronic ignition. Some RV water heaters include an electric heating element for shore power use, but these particular Suburban and Dometic 6-gallon units focus on propane heating with DSI. If you require electric heating capability, look for models featuring dedicated electric elements alongside propane burners.
I’m Bill Rowell, the founder of RVupgrades.com. In 2002, I launched the business to help fellow RV enthusiasts find unique and hard-to-find products. Over the years, it’s grown to offer more than 15,000 items, with a warehouse in Eastlake, Ohio. Having owned and repaired nearly every type of RV, I bring over two decades of hands-on experience to the table. For me, this isn’t just a business – it’s a passion and a way of life that I love sharing with the RV community.
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