10 Gallon RV Water Heaters

Shop 10 gallon RV water heaters for motorhomes, fifth wheels, travel trailers, toy haulers, and other recreational vehicles. A 10 gallon RV water heater provides greater stored hot-water capacity than a standard 6 gallon model, making it a popular choice for larger RVs, families, full-time travelers, and anyone with heavier daily hot-water needs.

Available options include propane water heaters, gas and electric models, high-output XT water heaters, and tankless replacements designed to fit openings previously occupied by traditional 10 gallon units.

Types of 10 Gallon RV Water Heaters

Not every water heater listed for a 10 gallon application operates the same way. Some models contain a physical 10 gallon storage tank, while others use mixing-valve technology to increase usable output or provide tankless hot water from a replacement unit installed in a 10 gallon opening.

Common options include:

• Gas-only 10 gallon RV water heaters

• Gas and electric 10 gallon RV water heaters

• High-output and XT water heaters

• Direct-spark ignition models

• Motor-aid water heaters

• Tankless replacements for 10 gallon openings

• Replacement models for Dometic, Atwood, and Suburban water heaters

The correct water heater depends on the original model, available energy sources, RV wiring, installation dimensions, desired capacity, and required exterior door.

Gas-Only 10 Gallon RV Water Heaters

A gas-only 10 gallon RV water heater uses propane as its source of heat. These models are useful for RV owners who regularly dry camp, boondock, or travel without dependable access to shore power.

Most current gas-only water heaters use direct-spark ignition rather than a manually lit pilot. Although propane heats the water, 12-volt DC power is typically required for the control board, electronic ignition, gas valve, and safety components.

A gas-only model may be appropriate when:

• The RV does not have a 120-volt water-heater circuit

• Propane operation is preferred

• Electrical hookups are rarely available

• The owner wants to reduce the RV’s AC electrical load

• An existing gas-only water heater is being replaced

The Suburban SW10D is an example of a 10 gallon propane water heater with direct-spark ignition.

Gas and Electric 10 Gallon RV Water Heaters

Gas and electric 10 gallon RV water heaters provide two available heat sources. Propane can heat the water while traveling or camping without hookups, while the electric heating element can be used when the RV is connected to shore power.

Many models can also use propane and electricity together for faster recovery when the water heater and RV control system support simultaneous operation.

A gas and electric model may be the best choice for RV owners who:

• Regularly stay at powered campgrounds

• Want to conserve propane

• Need faster hot-water recovery

• Travel both on and off the electrical grid

• Are replacing an existing dual-energy model

• Want flexibility in how water is heated

Current examples include the Dometic WH-10GEA and several Suburban SW10 gas and electric configurations.

Dometic 10 Gallon RV Water Heaters

Dometic offers conventional and extended-capacity water heaters built around a physical 10 gallon tank.

Current Dometic options include:

• Dometic WH-10GEA 10 Gallon Gas and Electric Water Heater

• Dometic WH-16GEA XT Gas and Electric Water Heater

The WH-10GEA is a conventional model that provides approximately 10 gallons of stored hot water. The WH-16GEA XT uses a mixing valve to increase the amount of usable hot water produced by its physical 10 gallon tank.

Dometic water heaters use aluminum tanks and generally do not require sacrificial anode rods.

Dometic WH-10GEA Water Heater

The Dometic WH-10GEA is a conventional 10 gallon gas and electric RV water heater. It can heat water with propane, a 120-volt AC heating element, or both heat sources when properly installed.

Its larger tank makes it well suited for families, full-time RV living, longer showers, and recreational vehicles with greater daily hot-water demand.

The WH-10GEA may replace select older 10 gallon Dometic and Atwood models, but compatibility must be confirmed using the complete original model number, dimensions, wiring, plumbing, and exterior-door requirements.

Dometic WH-16GEA XT Water Heater

The Dometic WH-16GEA XT has a physical 10 gallon tank but uses thermostatic mixing-valve technology to provide approximately 16 gallons of effective hot water.

Water is heated to a higher temperature inside the tank and blended with cold water before reaching the RV’s faucets and shower. This increases the volume of usable hot water without requiring a physical 16 gallon storage tank.

The WH-16GEA XT is a practical option for larger families, full-time RVers, and owners who regularly exhaust the supply of a conventional 10 gallon water heater.

Because the XT mixing-valve assembly adds depth to the water heater, available interior space must be measured carefully before ordering.

Suburban 10 Gallon RV Water Heaters

Suburban offers several 10 gallon RV water-heater configurations. Model variations may include propane heating, electric heating, direct-spark ignition, interior electric-element controls, and additional wiring or control features.

Common Suburban 10 gallon model families include:

• Suburban SW10D

• Suburban SW10DE

• Suburban SW10DEL

• Suburban SW10DEC

• Suburban SW10DELC

The letters following SW10 identify important differences in ignition, electric heating, switches, relays, controls, and electrical connections. Always match the complete model number rather than ordering based only on the 10 gallon capacity.

Suburban water heaters typically use porcelain-lined steel tanks with replaceable anode rods.

Understanding Suburban SW10 Model Numbers

A Suburban model number provides important information about the water heater’s features.

Depending on the model, the letters may identify:

• Direct-spark ignition

• A 120-volt electric heating element

• An interior electric-element relay

• A power cord or junction-box configuration

• Combined gas and electric controls

• Additional installation or wiring features

For example, the SW10D and SW10DE are both 10 gallon models, but the SW10DE adds an electric heating element. These models should not be treated as interchangeable without checking the complete installation requirements.

Atwood 10 Gallon RV Water Heater Replacements

Atwood 10 gallon water heaters were installed in many older motorhomes, fifth wheels, travel trailers, and toy haulers. Dometic now supports many products and replacement applications previously associated with the Atwood brand.

Common older Atwood model families include:

• G10A gas water heaters

• GC10A gas and electric water heaters

• GCH10A motor-aid water heaters

• Direct-spark ignition variations

• Electronic-ignition revisions

• XT and extended-capacity models

Every letter and revision number can indicate a difference in fuel type, electric heating, ignition, motor-aid plumbing, controls, or installation requirements.

A current Dometic or tankless replacement should never be chosen based only on the Atwood name and 10 gallon capacity.

Motor-Aid 10 Gallon Water Heaters

Some older 10 gallon RV water heaters include motor-aid connections. These systems circulate heated engine coolant through a heat exchanger attached to the water-heater tank, allowing the vehicle’s engine to help heat the water while driving.

A motor-aid model may have additional plumbing connections that are not present on a standard propane or gas and electric water heater.

When replacing a motor-aid water heater, determine whether the engine-coolant feature must be retained, disconnected, rerouted, or professionally modified. A conventional replacement may not directly support the original motor-aid system.

High-Output 10 Gallon RV Water Heaters

High-output water heaters provide more usable hot water than their physical tank capacity might suggest.

The Dometic WH-16GEA XT, for example, uses a physical 10 gallon tank but produces approximately 16 gallons of effective hot water through mixing-valve technology.

A high-output model may be useful for:

• Longer showers

• Families traveling together

• Back-to-back showers

• Full-time RV living

• Larger motorhomes and fifth wheels

• Owners who regularly run out of hot water

Effective capacity should not be confused with physical tank size. A model described as providing 16 gallons of hot water may still have a physical 10 gallon tank.

Tankless Replacements for 10 Gallon Water Heaters

A tankless RV water heater does not contain a 10 gallon storage tank. It heats water as it flows through the unit.

Some tankless models are described as replacements for 10 gallon water heaters because they are sold with an exterior door, trim ring, or mounting system designed to cover the larger opening left by the original tank-style unit.

Tankless replacement packages may be available for:

• Atwood and Dometic 10 gallon openings

• Suburban 10 gallon openings

• Gas-only tank replacements

• Gas and electric tank replacements

Girard, Suburban, Furrion, and other manufacturers offer tankless RV water heaters that may be configured for larger replacement openings.

Tankless vs. 10 Gallon Tank Water Heaters

A traditional 10 gallon water heater stores a fixed amount of heated water. Once that supply is depleted, the tank must recover before another full supply is available.

A tankless model heats water continuously as it passes through the unit. Hot-water availability is limited by freshwater, propane, battery power, water pressure, and wastewater capacity rather than by a fixed storage tank.

A tankless replacement may be preferable when:

• Continuous hot water is a priority

• Several people take consecutive showers

• Lower water-heater weight is desired

• Tank-recovery time is a frequent problem

• Propane operation is acceptable

A conventional 10 gallon tank model may be preferable when:

• Electric heating is important

• Stored hot water is preferred

• The existing installation is in good condition

• Consistent low-flow performance is needed

• A direct replacement is desired

• Minimal installation changes are preferred

10 Gallon vs. 6 Gallon RV Water Heaters

A 10 gallon RV water heater stores approximately four more gallons of water than a conventional 6 gallon model. This additional capacity can provide longer showers and more hot water for multiple occupants.

However, a 10 gallon water heater is also larger and heavier. It normally requires a wider and taller exterior opening than a 6 gallon model and may require additional interior depth.

Moving from a 6 gallon to a 10 gallon unit may require:

• Enlarging the RV sidewall opening

• Modifying structural framing

• Installing a larger exterior door

• Relocating plumbing

• Relocating the propane line

• Changing electrical wiring

• Increasing interior clearance

• Supporting the additional weight

An XT or tankless model may provide more usable hot water without converting the RV to a conventional 10 gallon opening.

How Long Does a 10 Gallon RV Water Heater Last During a Shower?

Shower time depends on more than tank capacity. Important factors include:

• Stored-water temperature

• Incoming cold-water temperature

• Showerhead flow rate

• Amount of cold water mixed at the faucet

• Burner output

• Electric-element output

• Whether gas and electricity are used together

• Recovery while the shower is running

• Whether the model uses mixing-valve technology

A low-flow showerhead and moderate water temperature can significantly extend the usable supply.

An XT water heater may provide additional shower time because the hotter stored water is blended with cold water before use.

How Long Does a 10 Gallon RV Water Heater Take to Heat?

Heating time varies by model, burner rating, electric-element wattage, incoming water temperature, and selected heat source.

Propane usually heats the tank faster than the electric element operating alone. Gas and electric models may provide the fastest recovery when both heat sources are used simultaneously and the installation supports combined operation.

A larger 10 gallon tank generally takes longer to heat from cold than a comparable 6 gallon tank, but it also stores a greater supply of hot water.

Aluminum vs. Steel Water-Heater Tanks

Dometic and older Atwood water heaters commonly use aluminum tanks. These tanks generally use a removable drain plug and do not require a sacrificial anode rod.

Suburban water heaters commonly use porcelain-lined steel tanks. These models use a replaceable anode rod to help protect the steel tank against corrosion.

Do not install an anode rod based only on the water heater’s capacity. Use the exact drain plug or anode rod specified by the manufacturer for the specific model.

Does a 10 Gallon RV Water Heater Include the Door?

Many replacement RV water heaters are sold without an exterior access door. Others are available as complete packages with a door, trim ring, controller, or installation hardware.

The original door may not fit when:

• Changing from Atwood or Dometic to Suburban

• Changing from Suburban to Dometic

• Installing an XT model

• Converting from a tank to a tankless unit

• Replacing a discontinued model

• Changing the required opening size

• Selecting a different mounting system

Always verify whether the water heater includes a door and whether that door matches the RV’s existing opening.

Choosing a Replacement 10 Gallon RV Water Heater

The complete model number from the original water heater is the most important piece of information when selecting a replacement.

Before ordering, verify:

• Original manufacturer

• Complete model number

• Product or serial number

• Physical tank capacity

• Effective hot-water capacity

• Gas-only or gas and electric operation

• Pilot or direct-spark ignition

• Motor-aid connections

• Exterior cutout dimensions

• Available interior depth

• Exterior-door dimensions

• Propane connection location

• Hot and cold water-line locations

• 12-volt DC wiring

• 120-volt AC wiring

• Interior switches and controls

• Required door, trim ring, or adapter kit

Two water heaters can both be described as 10 gallon models while using different tanks, dimensions, wiring, controls, doors, and mounting systems.

Find the Correct 10 Gallon RV Water Heater

Browse 10 gallon RV water heaters and compatible replacements from Dometic, Suburban, Girard, and other leading RV water-heater manufacturers.

Choose from conventional propane models, gas and electric water heaters, high-output XT units, motor-aid replacements, and tankless systems designed for common 10 gallon openings.

For the most accurate replacement match, locate the data label on the existing water heater and record the complete manufacturer, model number, and product number. Compare the original unit’s dimensions, energy sources, wiring, plumbing, exterior door, tank construction, and mounting requirements before ordering.