Optimizing Your RV Hot Water: Dual-Fuel Power with Suburban Heaters

Unlocking Faster Recovery and Consistent Warmth in Your Mobile Home

Many RV enthusiasts often wonder about the optimal way to heat water in their recreational vehicles, especially concerning dual-fuel water heaters. The good news is that for most modern RV water heaters, particularly those manufactured by Suburban, it is not only possible but often recommended to run both gas and electric heating elements simultaneously. This dual-source operation significantly enhances the water heater's performance, leading to quicker recovery times and a more consistent supply of hot water, which is a major advantage for comfortable RV living.

Key Takeaways for Dual-Fuel Operation

Enhanced Recovery Rate: Combining both gas and electric heating allows your RV water heater to replenish hot water significantly faster than using either source alone. This is particularly beneficial for back-to-back showers or when multiple hot water demands occur.
Efficient Hot Water Supply: Utilizing both energy sources can transform a standard 6-gallon tank into one that performs more like a much larger unit, often comparable to a 10 or 12-gallon capacity in terms of effective hot water output.
Versatility in Power Sources: Dual-fuel heaters provide flexibility. When connected to shore power at a campground, you can leverage the electric element, often included in your site fee. For faster heating or when boondocking, propane gas becomes your primary or supplementary heat source.

Understanding Suburban Dual-Fuel Water Heaters

The Mechanics of Combined Heating

Suburban has been a leading manufacturer of RV water heaters for over 30 years, offering a range of models including gas-only, electric-only, and most popularly, gas/electric combination units. These combination units are designed specifically to utilize both energy sources, allowing for efficient and rapid water heating.

When both gas and electric modes are active, the water heater essentially receives heat from two different methods and locations within the tank. The gas burner, known for its high BTU output, provides a rapid initial heating boost, while the electric element maintains temperature and contributes to the overall heating process. This synergy ensures that the water heats up quickly and stays hot for longer durations, greatly improving the user experience, especially during high-demand periods like showering or doing dishes.

Suburban RV Camper Trailer Gas/Electric Water Heater SW6DE 6 Gallon 12,000 BTU

A typical Suburban 6-gallon gas/electric RV water heater, designed for dual-fuel operation.

Recovery Rate Advantages

One of the most significant benefits of running both gas and electric concurrently is the impressive recovery rate. For instance, a 6-gallon Suburban gas water heater typically has a recovery rate of around 10.2 gallons per hour (BTUH). When the 1440-watt Incoloy electric element is used alone, the recovery rate is approximately 6.1 gallons per hour. However, by engaging both gas and electric simultaneously, the combined recovery rate can soar to about 16.2 gallons per hour. This enhanced recovery capability means you'll spend less time waiting for hot water and can enjoy extended showers without running out.

How the System Integrates

Suburban water heaters feature a porcelain-lined steel tank and an anode rod for corrosion protection, similar to residential water heaters. The heating process is managed by thermostats that regulate both the gas burner and the electric element. When both are activated, they work in conjunction to bring the water to the desired temperature and maintain it efficiently. The direct spark ignition (DSI) for the gas portion allows for convenient control from inside the RV, often via a 12-volt relay.

Practical Applications and Benefits

When to Use Both Gas and Electric

The decision to use both heating sources often comes down to specific needs and situations. Here are common scenarios where running both gas and electric is highly advantageous:

Taking Showers: This is perhaps the most common reason. For multiple back-to-back showers or longer showers, running both ensures a continuous supply of hot water, minimizing the chances of running out.
High Demand Situations: If you're washing dishes, cleaning, or have several people needing hot water simultaneously, combining the heat sources provides the necessary rapid heating and sustained temperature.
Cold Weather Camping: In colder environments, the water entering the tank will be colder, requiring more energy to heat. Dual-fuel operation helps the heater keep up with demand more effectively.
Quick Heating: If you arrive at a campsite and need hot water quickly, turning on both gas and electric will heat the tank much faster than using only one source.

Energy Consumption Considerations

While using both gas and electric offers superior performance, it's essential to be mindful of energy consumption. When hooked up to shore power, the electric element utilizes campground electricity, which is often included in your site fee. However, the electric element can consume a significant portion of your available electrical service (e.g., about 1/3 of total electrical service power availability). If you're running other high-amperage appliances like air conditioners, using both heating elements simultaneously might trip a breaker. Propane, on the other hand, is a consumable resource that you pay for by the tank. Balancing these costs and demands is part of smart RV management.

Understanding RV Water Heater Performance

To further illustrate the benefits, let's look at a comparative analysis of different heating methods for RV water heaters. This radar chart provides an opinionated analysis of various performance aspects when using electric only, gas only, or both concurrently.

The radar chart clearly illustrates that combining gas and electric heating offers the best overall performance, particularly in terms of hot water recovery speed and consistency. While electric-only excels at campground power utilization (since it's usually "free" as part of the site fee), and gas-only is strong for boondocking, the combination mode provides a robust solution for most RVing scenarios, bridging the gap between these two extremes.

Operational Guidelines and Safety Tips

Ensuring Safe and Effective Operation

While running both gas and electric on your Suburban RV water heater is safe and effective, there are a few important considerations and safety tips to keep in mind:

Always Have Water in the Tank: Before turning on any heating element (gas or electric), ensure the water heater tank is full of water. Running it dry, especially the electric element, can cause damage.
Anode Rod Maintenance: Suburban water heaters use a porcelain-lined steel tank with an anode rod to absorb electrolytic action and prevent corrosion. Regularly inspect and replace the anode rod as needed to prolong the life of your water heater.
Draining the Tank: If you need to drain the tank for storage or maintenance, always turn off the electric power first, then the gas supply.
Gas Odor: If you ever smell gas, immediately evacuate all persons from the RV, shut off the gas supply at the container or source, and ensure proper ventilation. Do not attempt to operate the water heater or any other gas appliance until the issue is resolved by a qualified technician.
Professional Service: Installation and complex service of gas appliances should always be performed by a qualified service agency or gas supplier.

Maintenance and Troubleshooting Resources

Suburban provides extensive documentation, including installation, operation, and maintenance manuals for their water heaters. These resources are invaluable for understanding your specific model and troubleshooting common issues. Many RV forums and communities also offer a wealth of shared experience and advice. For instance, common issues like the water heater not working on electric or gas can often be diagnosed with simple checks, but always consult the manual or a professional if unsure.

A comprehensive guide on operating your Suburban RV Water Heater, covering various aspects of its functionality.

This video provides a detailed walkthrough of how a Suburban RV water heater operates, including insights into both gas and electric modes. It's a valuable visual aid for new RV owners or anyone looking to better understand the nuances of their water heating system, further reinforcing the concept of dual-fuel usage for optimal performance.

Comparative Analysis of RV Water Heater Types

Understanding Your Options

RV water heaters come in various configurations. While the focus here is on dual-fuel Suburban units, it's helpful to understand the broader landscape of options available:

Water Heater Type	Primary Fuel Source	Advantages	Disadvantages	Best Use Case
Electric-Only	120V AC Electricity	Quiet operation, clean-burning, often "free" at campgrounds with hookups.	Slow recovery, not ideal for boondocking without large battery/solar/generator, generally won't heat underbelly.	Campgrounds with full electric hookups, low hot water demand.
Gas (Propane)-Only	LP Gas (Propane)	Fast heating/recovery, excellent for boondocking, heats underbelly (some models).	Consumes propane (additional cost), produces exhaust, requires 12V electricity for ignition and fan.	Boondocking, remote camping, high hot water demand when electricity is limited.
Gas/Electric Combination (e.g., Suburban)	LP Gas & 120V AC Electricity	Fastest recovery when both active, versatile fuel options, consistent hot water supply.	Higher initial cost, consumes propane when gas is used, can trip breakers if other high-draw appliances are on.	Versatile RVing (campgrounds and boondocking), high hot water demand, desire for rapid heating.
Tankless/On-Demand	LP Gas (typically)	Endless hot water supply, compact size.	Higher initial cost, can be finicky with water flow rates, requires sufficient water pressure to activate.	For RVers who need continuous hot water and are mindful of water flow.

This table highlights why the gas/electric combination unit, like those offered by Suburban, is often considered the most flexible and advantageous option for many RVers, providing the best of both worlds regarding heating speed and energy source versatility.

Frequently Asked Questions

Can running both gas and electric damage my RV water heater?

No, for dual-fuel Suburban water heaters, running both gas and electric simultaneously is a designed feature and will not cause damage. In fact, it is recommended to achieve the fastest hot water recovery. Just ensure there is always water in the tank before turning on any heating element.

Will running both gas and electric use a lot of propane?

When both are running, the gas element provides a significant portion of the heating power, especially for rapid recovery. While it does consume propane, the benefit is faster heating and extended hot water supply. You can typically switch to electric-only once the water is hot to conserve propane if connected to shore power.

How do I know if my Suburban water heater is dual-fuel?

Most Suburban water heaters with "DE" in their model number (e.g., SW6DE, SW10DE, SW12DE) indicate "Direct Spark Ignition-Gas/Electric." Check your RV's control panel for separate switches for "gas" and "electric" water heater operation, and consult your RV's or water heater's manual for confirmation.

Is it more efficient to run both gas and electric, or just one?

Efficiency depends on your goals. For the fastest hot water recovery and highest volume of hot water, running both is most efficient in terms of time and hot water availability. For conserving propane when connected to shore power, using only the electric element is more economical as the electricity cost is usually included in your site fee.

What is the difference between a 6-gallon and a 10-gallon Suburban water heater?

The primary difference is the tank capacity. A 10-gallon unit holds more hot water, extending the duration of hot water availability. However, by running both gas and electric, a 6-gallon tank can effectively provide hot water comparable to larger units in terms of recovery rate, thanks to the combined heating power.

Conclusion

In conclusion, for Suburban RV water heaters designed for dual-fuel operation, leveraging both the gas and electric heating elements simultaneously is a highly effective strategy. This approach maximizes hot water recovery speed and ensures a more consistent supply, significantly enhancing the comfort and convenience of your RV experience. While electric-only is cost-effective at campgrounds and gas-only is crucial for boondocking, the combination mode provides the ultimate flexibility and performance for demanding hot water needs. Always remember to prioritize safety by ensuring the tank is full before operation and adhering to all manufacturer guidelines and proper maintenance practices.