12 Electric Vs Gas Water Heater of 2026 To Avoid Costly Retrofits

1

Rheem 6.5kW 240V Point of Use Thermostatic Tankless Electric Water

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  9.7
• Brand
  Rheem

Key specs2

Point of use footprint

3 x 6 x 6 inches, 4 lb cabinet

Electrical supply requirement

Operating this tankless unit requires a dedicated 240-volt circuit. Check your breaker box to confirm available capacity before mounting near the intended sink.

Pros & cons43

Pros

• Compact 3 by 6 by 6 inch casing fits directly under sinks or inside tight cabinets
• Active thermostatic monitoring maintains outlet temperature within 1 degree of your target
• On-demand electric heating draws power only while hot water runs
• Weighs just 4 pounds for easy wall mounting near dedicated fixtures

Cons

• 6.5kW heating capacity limits use to a single sink rather than multiple fixtures
• Requires a dedicated 240-volt electrical connection before installation
• Flow rate in gallons per minute is unlisted and depends on incoming groundwater temperature

2

FOGATTI HybridShower 6 Ultra RV Tank Water Heater, Gas Electric

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  9.3
• Brand
  FOGATTI

Key specs2

RV cutout compatibility

Suburban and Dometic standard openings with 15x15 door

Dual-fuel operation

Run on electric shore power at fully serviced campsites to conserve propane, switch to gas while boondocking, or fire both together when quick shower turnaround matters.

Pros & cons43

Pros

• Dual-fuel design lets you switch between campground electric power and off-grid propane
• High-output 12,000 BTU propane burner speeds recovery between camping showers
• Powered anode rod actively protects the porcelain-lined steel tank against corrosion
• Drop-in replacement engineered for standard Suburban and Dometic RV cutouts

Cons

• Requires access to both a 120-volt AC power hookup and an RV propane line
• Storage capacity is unstated in the listing and should be confirmed for family use
• Exterior door size of 15 by 15 inches may require an adapter plate on non-standard openings

3

Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water

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  9.3
• Brand
  Rheem

Key specs2

Outdoor installation benefit

Mounting this natural gas unit on an exterior wall avoids cutting through your roof or exterior drywall for expensive venting pipes, simplifying the changeover from an electric tank.

Flow capacity and output

7.0 GPM at 35F rise, 160,000 BTU/hr

Pros & cons43

Pros

• Outdoor exterior mounting completely eliminates the need for indoor venting ducts
• Generates 7.0 GPM at a 35-degree rise to supply 2 to 3 showers simultaneously
• Delivers a 0.82 UEF rating to cut operating expenses compared to 50-gallon tanks
• Backed by a 15-year heat exchanger warranty and a 5-year parts warranty

Cons

• Requires an existing exterior natural gas supply line and dedicated outdoor wall space
• Outdoor placement requires professional installation and freeze protection monitoring
• Lacks built-in Wi-Fi monitoring functionality found on higher-tier alternatives

4

Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water

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  8.9
• Brand
  Rheem

Key specs2

Indoor venting requirement

Indoor natural gas combustion requires a dedicated direct-vent pipe through an outside wall or roof. Confirm your home layout allows clear venting pathways before replacing an electric tank.

Integrated leak protection

LeakGuard internal water leak detection

Pros & cons43

Pros

• Delivers up to 7.0 GPM at a 35-degree temperature rise for 2 to 3 concurrent showers
• Integrated LeakGuard system senses internal leaks early to protect living spaces
• Direct vent configuration safely draws intake air and expels exhaust through exterior walls
• Wall-mounted design frees up basement or utility closet floor space

Cons

• Requires installing a dedicated indoor direct vent pipe to the exterior of the house
• Needs an adequate natural gas line volume capable of supporting 160,000 BTU per hour
• Heavier indoor profile at 46.5 pounds requires solid wall mounting studs

5

KINGRVER 6 Gallon RV Tank Water Heater, Propane & Electric

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  8.8
• Brand
  KINGRVER

Key specs2

RV cutout compatibility

Fits 4 to 6 gallon cutouts, requires 3-inch pipe depth

Remote interface control

The included interior controller adjusts water temperature between 104F and 140F and switches power modes directly from the living quarters without opening exterior panels.

Pros & cons43

Pros

• Includes a wired remote control to switch heating modes and set temps from 104F to 140F
• Three operating modes let you select propane, 120V electric, or combined hybrid heating
• 4-layer 6-gallon insulated tank holds consistent warmth without cold-water fluctuations
• Designed for common 4 to 6 gallon RV cutouts across Suburban, Atwood, and Dometic setups

Cons

• Cabinet depth requires at least 3 extra inches of interior clearance for plumbing lines
• Requires both 12V DC wiring for ignition and 120V AC service for electric mode
• 6-gallon capacity limits consecutive shower times unless running in hybrid mode

6

Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water

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  8.7
• Brand
  Rheem

Key specs2

Outdoor installation benefit

Exterior mounting sidesteps the structural cuts and interior ductwork required for gas venting. Ensure your home has sufficient outdoor clearance and access to an exterior propane supply.

Liquid propane demand

160,000 BTU/hr on dedicated propane line

Pros & cons43

Pros

• Outdoor installation bypasses complex indoor exhaust ducting and roof penetrations
• Generates 7.0 GPM at 35-degree rise using dedicated liquid propane supply lines
• Built-in freeze and flame failure protection safeguard the unit in outdoor weather
• Protected by a 15-year heat exchanger warranty and a 5-year parts warranty

Cons

• Strictly engineered for liquid propane and cannot run on standard natural gas lines
• Requires an exterior wall location with adequate clearance and propane tank plumbing
• High demand of 160,000 BTU per hour requires a properly sized propane regulator

7

WH-6GEA RV Gas and Electric Water Heater - 12 Volt

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  8.5
• Brand
  Elk Mountain

Key specs2

Tank maintenance demand

The aluminum water tank resists rust naturally, removing the routine chore of checking and replacing sacrificial anode rods found in standard steel tanks.

Cabinet dimensions

16 x 16 x 14 inch core, 6-gallon capacity

Pros & cons43

Pros

• Corrosion-resistant aluminum tank eliminates the need for periodic anode rod replacement
• Dual gas and electric capabilities provide flexibility for boondocking or hookup camping
• 6-gallon tank size fits standard compact RV cabinet compartments
• Uses 12-volt power to support mobile operation on the road

Cons

• Listing leaves burner BTU ratings and recovery rates unstated
• Requires confirming whether existing RV wall cutout matches 16 by 16 by 14 inch framing
• Lacks a digital temperature display or wired remote controller

8

Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120

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  8.4
• Brand
  Rheem

Key specs2

Condensing thermal efficiency

0.93 UEF rating with ultra-low NOx compliance

Multitap simultaneous capacity

Delivering 8.4 GPM at a 35-degree rise allows large households to run three to four showers at the same time without losing water temperature.

Pros & cons43

Pros

• Advanced condensing technology achieves a 0.93 UEF rating for lower fuel consumption
• High 8.4 GPM flow rate supports up to 3 or 4 simultaneous showers in busy homes
• Direct vent indoor design safely expels exhaust while meeting ultra-low NOx standards
• Backed by a 15-year heat exchanger warranty and a 5-year parts warranty

Cons

• Condensing operation produces acidic condensate that requires a dedicated drainage line
• Demands indoor direct venting pipes and a 157,000 BTU natural gas supply line
• Heavy 59.88-pound unit requires secure wall mounting and professional installation

9

ThermoMate CZ422NG, 102,000 BTU 4.7 GPM Natural Gas Tankless Water

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  8.3
• Brand
  thermomate

Key specs2

Utility hookup connections

• 3/4-inch NPT water inlet and outlet
• 1/2-inch NPT natural gas inlet
• 3-inch OD exhaust vent connection
• UL-approved 120V plug with 5-foot cord

Diagnostic display

3.5-inch LED screen with error codes and flame status

Pros & cons43

Pros

• Includes a pre-attached 5-foot UL-certified 120V cord to plug directly into an outlet
• Built-in 3.5-inch LED display provides real-time error codes, fan, and flame status
• Standard 3/4-inch water lines and 1/2-inch gas connections simplify household hookups
• Oxygen-free copper heat exchanger delivers a 0.81 UEF rating for lower fuel waste

Cons

• Requires a 3-inch outer diameter dedicated indoor venting duct to the exterior
• Output maxes out at 2 simultaneous showers, limiting larger multi-bath homes
• Natural gas only, requiring fuel line conversion kits if using propane

10

Rheem 18kW 240V Tankless Electric Water Heater, Gray

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  7.9
• Brand
  Rheem

Key specs2

Electrical supply requirement

An 18kW draw at 240 volts demands heavy electrical panel capacity. Check your home main breaker service and verify required double-pole breaker space before replacing a tank.

Heating element serviceability

Dual threaded copper immersion elements, field serviceable

Pros & cons43

Pros

• Modulating heating elements draw only the electric power required for current demand
• Two field-serviceable copper immersion elements screw out for straightforward maintenance
• Bottom 3/4-inch NPT plumbing ports match standard residential water supply lines
• Provides continuous hot water up to 4.4 GPM without any gas venting pipes

Cons

• 18kW electrical draw requires significant breaker box space and dedicated 240V wiring
• Flow rate reduces in colder climates where incoming groundwater temperatures drop
• 4.4 GPM max output may struggle if multiple high-flow showers run at the same time

11

FOGATTI HybridShower 10 Ultra RV Tank Water Heater, Gas Electric

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  7.4
• Brand
  FOGATTI

Key specs2

Dual-fuel operation

Switching between campground electric hookups and off-grid propane lets RV owners conserve bottled gas or combine both heat sources for rapid tank recovery between family showers.

10-gallon cutout fit

Suburban and Dometic 10-gal replacement with 18x18 door

Pros & cons43

Pros

• Generous 10-gallon capacity supplies longer hot showers than smaller 6-gallon tanks
• High-output 12,000 BTU burner speeds water recovery when boondocking on propane
• Triple-power versatility allows shore power electric, propane, or combined hybrid use
• Direct replacement designed for Suburban and Dometic 10-gallon RV openings

Cons

• 18.5 by 21 by 18.5 inch dimensions require a dedicated large-format RV cutout
• Comes with an 18 by 18 inch door that will not fit smaller 6-gallon exterior cutouts
• Needs both a functional 120-volt AC circuit and a regulated propane line connection

12

CAMPLUX 6 Gallon RV Water Heater, Propane & Electric Hybrid,

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  7.4
• Brand
  CAMPLUX ENJOY OUTDOOR LIFE

Key specs2

Internal tank protection

The porcelain-lined steel tank resists mineral scale and works in tandem with an integrated sacrificial anode rod to extend service life in harsh camping water conditions.

Control panel placement

Interior wall-mounted control panel

Pros & cons43

Pros

• Interior control panel lets you adjust water temperature and modes from inside the RV
• Drop-in fit for standard 13 by 13 inch cutouts with an included 15 by 15 inch door
• Porcelain-lined steel tank and sacrificial anode rod fight corrosion and scale buildup
• Flexible three-mode heating runs on 120V AC electric, propane, or both combined

Cons

• 6-gallon capacity requires hybrid mode to keep up with back-to-back showers
• Requires dual wiring for both 12V DC electronic ignition and 120V AC shore power
• Propane burner BTU rating is not specified in the listing data

Last update on 2026-10-05 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Is a gas or electric water heater cheaper to install and run?

Operating costs generally favor gas, but installation costs depend entirely on your existing utility hookups. A non-condensing gas tankless water heater with a 0.82 Uniform Energy Factor (UEF) can save up to 34% on energy costs compared to a 50-gallon electric tank heater. But installing a gas model where no gas line exists requires running dedicated supply pipes and cutting vent runs. Electric models avoid exhaust venting, but whole-house electric units demand high-amperage 240V circuits that can trigger an electrical service panel upgrade if your home lacks spare capacity.

Does an electrical panel need an upgrade for a tankless electric water heater?

Check your main breaker box before buying an electric tankless unit, because whole-house models draw massive amounts of electrical power. A whole-home unit rated at 18kW requires a 240V supply, while a compact point-of-use unit needs 6.5kW at 240V. If your electrical panel lacks open double-pole breaker spaces or sufficient main amperage, switching to electric can trigger thousands in wiring retrofits. In that scenario, sticking with your existing natural gas line or installing an outdoor tankless unit avoids heavy panel remodeling.

Will an electric or gas tankless water heater support multiple simultaneous showers?

Gas tankless water heaters deliver much higher flow rates than residential electric units when running multiple fixtures at once. A residential indoor natural gas model with 157,000 BTU per hour produces up to 8.4 GPM at a 35°F temperature rise to handle whole-house hot water demand. Even a smaller natural gas unit rated for 113,000 BTU delivers up to 5 GPM, which is enough to supply hot water for two showers at the same time at 105°F with a 65°F inlet water temperature. Compact 6.5kW 240V electric heaters are meant for single sinks or point-of-use locations rather than multiple showers. If you are setting up remote washing stations, confirm flow rates against the requirements of a tankless water heater for outdoor shower setup.

Do indoor gas water heaters require expensive venting retrofits?

Indoor natural gas tankless water heaters require dedicated venting through an exterior wall or roofline to discharge combustion exhaust safely. Indoor condensing models with a 0.93 UEF utilize direct vent systems, which require clear pathways to the outdoors. If cutting holes through your home roof or masonry creates difficult retrofit hurdles, an outdoor tankless model rated at 160,000 BTU mounts outside your exterior wall and eliminates indoor venting entirely. Confirm your local outdoor clearances and supply lines before deciding between indoor venting and outdoor mounting.

When does a dual-fuel hybrid water heater make sense for an RV?

A dual-fuel propane and electric hybrid water heater is ideal if you switch between campground hookups and dry camping off the grid. Hybrid RV units allow you to run on electric power when plugged into shore power to conserve propane, switch to propane when boondocking, or use both simultaneously in hybrid mode for fast recovery. Replacement models are sized directly for common 4 to 6 gallon cutouts from Suburban, Atwood, and Dometic setups. For larger rigs, a 10-gallon model equipped with a 12,000 BTU propane burner delivers up to 20% more heating power than standard 10,000 BTU RV burners.

How do you verify if a replacement water heater fits your existing cutout?

Measure the exact height, width, and cabinet depth of your current water heater compartment before selecting a new fuel source. In mobile applications, replacement doors commonly come in 15x15-inch or 18x18-inch dimensions to cover factory openings without requiring exterior siding repairs. For residential spaces, compact electric heaters measuring 3 x 6 x 6 inches fit directly under bathroom sinks where gas venting cannot go. If you are also evaluating appliances across living spaces, reviewing physical footprints like those for a heater for home spaces helps keep your installation free of structural alterations.