Suburban ST-42 42 Alternatives: 6 Similar Picks Compared

How alternatives differ from Suburban ST-42

Suburban 6-Gallon Gas and Electric RV Water Heater

The Suburban 6-Gallon unit uses a traditional tank design rather than the on-demand heating of the ST-42. It holds 4.0 gallons of hot water, providing a buffer for multiple uses, whereas the ST-42 heats water only when flow is detected. This model measures 12.7 inches square and weighs 32.9 pounds, making it slightly bulkier and heavier than the 21-pound ST-42. It supports both electric and gas fuel types, offering dual-fuel versatility that the propane-only ST-42 lacks. You should choose this if you need stored hot water for longer showers or dishwashing without waiting for heating cycles, accepting the trade-off of limited tank capacity and slower recovery times compared to tankless flow.

Ranein 65,000 BTU RV Tankless Water Heater

The Ranein 65,000 BTU heater delivers significantly more heating power than the 42,000 BTU Suburban ST-42. It measures 15 by 15 by 15 inches, creating a cubic footprint that differs from the ST-42’s rectangular 12 by 12 by 20-inch shape. Weighing 15.5 pounds, it is lighter than the 21-pound Suburban unit. The higher BTU rating suggests faster water heating and potentially higher flow rates, suitable for families needing steady hot water. This model lacks the specific freeze protection and child lock features detailed in the ST-42 data. Pick this if you prioritize heating speed and flow stability over the precise temperature safety controls and compact vertical profile of the Suburban ST-42.

APUS 80,000 BTU Propane RV Tankless Water Heater

The APUS 80,000 BTU heater offers substantially higher output than the 42,000 BTU Suburban ST-42. Its dimensions are 14.2 by 15 by 14.2 inches, and it weighs 24.1 pounds, making it slightly heavier and wider than the ST-42. This unit is designed for high-flow RV showers and performs well at high elevations, addressing potential pressure issues that might affect the ST-42. It includes a wired remote control, a feature not listed for the ST-42, which allows for easier temperature adjustment. Choose this model if you need maximum hot water volume and remote convenience, accepting a larger physical footprint and the absence of the specific freeze protection mechanisms found in the Suburban unit.

FOGATTI InstaShower 7 RV Propane Tankless Water Heater

The FOGATTI InstaShower 7 is a compact propane tankless heater designed for smaller RVs. It measures 15 by 15 by 15 inches, which is wider but shorter than the 20-inch length of the Suburban ST-42. The ST-42 weighs 21 pounds, while weight data for the FOGATTI is not provided. This model prioritizes compact size and high-altitude performance, making it a good fit for travelers with limited space or those camping at elevation. It lacks the explicit freeze protection and child lock features listed for the ST-42. Select this heater if your primary concern is fitting a tankless unit into a tight space, rather than needing the advanced safety controls and specific dimensions of the Suburban ST-42.

Camplux Elite Series RV Propane Water Heater

The Camplux Elite Series RV Water Heater specifies a flow rate of 2.64 GPM, a detail not provided for the Suburban ST-42. It measures 15.4 by 12.6 by 12.6 inches and weighs 35.4 pounds, making it heavier and slightly wider than the 21-pound ST-42. This model offers remote control operation and stable temperature precision, features that complement the ST-42’s manual control center. It is designed for high-altitude reliability. Choose this if you want precise flow rate data and remote convenience, accepting a heavier unit and different dimensions. The ST-42 remains the better choice if you prioritize its specific freeze protection and lower weight profile over remote operation capabilities.

KINGRVER SUMMIT XT 65K BTU RV Heater

The KINGRVER SUMMIT XT 65K BTU heater provides more heating power than the 42,000 BTU Suburban ST-42. It measures 15 by 15 by 15 inches, differing from the ST-42’s 12 by 12 by 20-inch shape. Weight data for this model is not listed, while the ST-42 weighs 21 pounds. This unit is designed for high-altitude RV camping and offers precise temperature control. It lacks the explicit freeze protection and child lock features detailed in the ST-42 specifications. Pick this if you need higher BTU output for faster heating in cold or high-altitude conditions, and if you prefer a cubic form factor over the rectangular design of the Suburban ST-42.

Quick picks

Our 7 picks

1 Best overall

Suburban ST-42 42k BTU RV Heater

Best for: Safety-focused RVers needing freeze protection

Fuel Type

Propane

BTU

42,000 BTU

Dimensions

12 x 12 x 20 inches

Use

RV

Weight

21 pounds

View on Amazon: Suburban ST-42 42k BTU RV Heater Affiliate link

The Suburban ST-42 is a 42,000 BTU tankless water heater designed for RV use. It measures 12 by 12 by 20 inches and weighs 21 pounds. This unit includes active freeze protection and voltage safeguards. It features a child lock limiting output to 113 F and a high-temperature kill switch capping heat at 131 F. You get a digital control center, though the required door is sold separately. It suits travelers prioritizing safety features over raw power.

Pros

• 42,000 BTU heating capacity
• Active freeze protection
• Child lock limits temp to 113 F
• High-temperature kill switch at 131 F
• Includes digital control center

Cons

• Lower 42,000 BTU output compared to 65,000+ BTU competitors
• Requires separate purchase of mounting door
• No remote control or app included

Good fit if

• You need reliable freeze protection for cold climates
• You prioritize child safety with strict temperature limits
• You prefer a compact 21-pound unit for tight spaces

Skip if

• You require instant hot water with higher flow rates
• You want a unit with included mounting hardware
• You need more than 42,000 BTU for multiple fixtures

Verdict: Suburban ST-42 42k BTU RV Heater offers robust safety features like freeze and scald protection for cautious RVers. It fits users who value precise temperature control and compact dimensions over high-volume heating speed.

2 Best premium

Suburban 6-Gallon Gas and Electric RV Water Heater

Best for: RVers needing durable hot water storage

Fuel Type

Electric, Gas

BTU

12,000 BTU/h

Wattage

1,440 W

Capacity

6 Gallon

Dimensions

12.69 x 12.69 x 19.19 in

Use

RV

View on Amazon: Suburban 6-Gallon Gas and Electric RV Water Heater Affiliate link

This Suburban unit is a compact 6-gallon tank designed for RVs. It features a porcelain-lined steel tank and a replaceable anode rod for corrosion protection. You can use propane or an optional 1,440-watt electric element. The gas recovery rate is 10.1 gallons per hour, while electric recovery is 6.1 gallons per hour. It fits a 12.7-inch cutout and weighs 32.9 pounds. It suits RVers needing reliable hot water storage.

Pros

• Porcelain-lined steel tank for durability
• Dual fuel capability with propane and optional electric element
• Replaceable anode rod simplifies maintenance
• Fast gas recovery rate of 10.1 gallons per hour

Cons

• Small 6-gallon storage capacity limits continuous hot water
• Electric heating element is optional and not included
• 2-year limited warranty is shorter than many competitors

Good fit if

• You need a compact heater for a small RV
• You want the option to use electric power at campsites
• You prefer a durable tank design with corrosion protection

Skip if

• You require instant hot water without storage
• You need a high-flow unit for multiple showers
• You want a longer warranty period

Verdict: Suburban 6-Gallon RV Water Heater offers durable storage and flexible power options for RVers. It fits buyers who prioritize tank longevity and dual-fuel versatility over high flow rates.

3 Best budget

Ranein 65,000 BTU RV Tankless Water Heater

Best for: RVers needing stable hot water flow

Fuel Type

Propane

Flow Rate

3.9 GPM

BTU

65,000 BTU

Voltage

12V DC

Temperature Control

95°F to 124°F

Certification

CSA

View on Amazon: Ranein 65,000 BTU RV Tankless Water Heater Affiliate link

The Ranein RA65LH delivers 65,000 BTU and 3.9 GPM for strong, stable hot water. It fits standard 12.8-inch RV cutouts and runs on 12V DC power. A thermostatic mixing chamber reduces temperature swings during use. The unit includes a multi-function remote and anti-freeze protection. It suits RVers who need reliable flow for showers or multiple faucets.

Pros

• 65,000 BTU output for fast heating
• 3.9 GPM flow rate supports simultaneous use
• Thermostatic mixing chamber stabilizes water temperature
• Multi-function remote monitors gas and flow
• CSA certified with anti-freeze protection

Cons

• Exterior door not included
• 15.5 pounds is heavier than some compact units
• Requires separate purchase for door kits

Good fit if

• You need stable hot water for multiple users
• You want a direct replacement for standard RV tank heaters
• You value real-time monitoring via remote

Skip if

• You prefer a unit with an included exterior door
• You need a higher flow rate than 3.9 GPM
• You require a lighter unit under 15 pounds

Verdict: The Ranein RA65LH 65k BTU RV Heater offers strong flow and stable temperatures for families or full-time RVers. It is best for those replacing standard tank heaters who need reliable performance without complex installation.

4 Also great

APUS 80,000 BTU Propane RV Tankless Water Heater

Best for: High-flow RV showers at elevation

Fuel Type

Propane

Flow Rate

4.8 GPM

BTU

80,000 BTU

Voltage

12V DC

Temperature Control

95–124°F

Certification

CSA

View on Amazon: APUS 80,000 BTU Propane RV Tankless Water Heater Affiliate link

The APUS 80,000 BTU RV tankless water heater delivers 4.8 GPM of continuous hot water powered by propane and 12V DC electricity. It fits standard 13x13 inch RV cutouts and includes a wired remote for temperature control between 95–124°F. This unit is designed for reliable performance at elevations up to 10,000 feet, making it suitable for diverse camping conditions.

Pros

• 80,000 BTU heating capacity for 4.8 GPM flow rate
• Fits standard 13x13 inch RV wall cutouts
• Includes wired remote controller for temperature adjustment
• Operates at elevations up to 10,000 feet
• CSA certified with multiple safety protections

Cons

• Requires 12V DC electrical connection
• Wired remote limits installation flexibility
• No automatic freeze protection below 35.6°F

Good fit if

• You need high flow rate for multiple fixtures
• You camp at high elevations
• You have 12V DC power available

Skip if

• You prefer wireless remote control
• You need automatic freeze protection
• You lack 12V DC power source

Verdict: APUS 80,000 BTU RV Tankless Heater provides strong performance for RVers needing high flow rates and high-altitude reliability. It suits travelers with 12V DC power who value wired remote convenience over wireless options.

5 Also great

FOGATTI InstaShower 7 RV Propane Tankless Water Heater

Best for: Compact RVs and high-altitude travel

Fuel Type

Propane

Flow Rate

2.5 GPM

Voltage

12V DC

Temperature Control

95–123°F

Dimensions

15 x 15 x 15 inches

Use

RV

View on Amazon: FOGATTI InstaShower 7 RV Propane Tankless Water Heater Affiliate link

The FOGATTI InstaShower 7 delivers 48,000 BTU and 2.5 GPM of hot water for RV use. It features a compact 15x15x15 inch footprint and CSA certification. The unit includes a built-in 150 PSI pressure relief valve and a 6.6-foot smart remote for temperature control between 95°F and 123°F. It also offers antifreeze protection down to -22°F and staged combustion for consistent heat at high altitudes up to 9,800 feet.

Pros

• 48,000 BTU heat output for instant hot water
• Built-in 150 PSI pressure relief valve
• 6.6-foot smart remote for easy temperature adjustment
• Antifreeze protection down to -22°F
• CSA certified with forced exhaust fan

Cons

• Lower flow rate of 2.5 GPM compared to competitors
• Lower BTU output of 48,000 compared to 65,000+ BTU models
• Requires separate purchase of mounting door options

Good fit if

• You need a compact heater that fits 15x15 inch spaces
• You travel to high altitudes up to 9,800 feet
• You want built-in pressure relief valve safety

Skip if

• You require higher flow rates above 2.5 GPM
• You need more than 48,000 BTU of heat
• You prefer a unit with a larger 18x18 inch footprint

Verdict: The FOGATTI InstaShower 7 RV Tankless Heater suits travelers prioritizing compact size and altitude performance over maximum flow rate. It fits well in smaller RVs where space is limited.

6 Best 2.64 gpm

Camplux Elite Series RV Propane Water Heater

Best for: RVers needing stable temp control and remote operation

Fuel Type

Propane

Flow Rate

3.9 GPM

BTU

65,000 BTU

Installation Location

Outdoor

Temperature Control

±1°F

Dimensions

12.6 x 12.6 x 15.4 inches

View on Amazon: Camplux Elite Series RV Propane Water Heater Affiliate link

This Camplux Elite 10 unit delivers 65,000 BTU of heating power with a maximum flow rate of 3.9 GPM. It features precise temperature regulation within ±1°F and includes an integrated mixing tank for stable output. The device weighs 35.4 pounds and measures 12.6 x 12.6 x 15.4 inches. It is designed for outdoor installation in RVs and off-grid cabins, supporting simultaneous use of multiple fixtures.

Pros

• 65,000 BTU heating core supports up to 3.9 GPM continuous flow
• Ultra-low 0.5 GPM startup flow rate saves propane and water
• ±1°F temperature accuracy with adjustable seasonal flame modes
• Includes 150 PSI pressure relief valve and smart remote controller
• Resists high winds over 50 MPH and works up to 9,800 ft elevation

Cons

• Maximum flow rate of 3.9 GPM is lower than the 80,000 BTU competitor
• Requires outdoor installation only
• Heavier at 35.4 pounds than some compact alternatives

Good fit if

• You need precise temperature control for comfortable showers
• You camp at high altitudes or in windy conditions
• You want a complete retrofit kit with remote control

Skip if

• You require indoor installation options
• You need a flow rate higher than 3.9 GPM
• You prefer a lighter unit under 30 pounds

Verdict: Camplux Elite 10 RV Water Heater offers stable hot water for RVers who prioritize temperature precision and high-altitude reliability. It suits those who value included installation hardware and remote control convenience over maximum flow speed.

7 Also great

KINGRVER SUMMIT XT 65K BTU RV Heater

Best for: High-altitude RV camping with precise temp control

Fuel Type

Propane

Flow Rate

Up to 3.8 GPM

BTU

65,000 BTU

Voltage

12V DC

Temperature Control

95°F to 123°F (±1°F)

Certification

CSA

View on Amazon: KINGRVER SUMMIT XT 65K BTU RV Heater Affiliate link

The KINGRVER SUMMIT XT delivers 65,000 BTU of propane heat with a 3.8 GPM flow rate. It fits standard 15x15 inch RV openings and includes a wired remote for precise temperature control from 95°F to 123°F. This unit is CSA certified and supports elevations up to 9,800 feet. It suits RVers who need reliable hot water for showers and dishwashing while traveling at high altitudes.

Pros

• 65,000 BTU/hr propane heating capacity
• 3.8 GPM continuous flow rate
• Wired remote controller with ±1°F accuracy
• CSA certified for safety
• Operates up to 9,800 ft elevation

Cons

• Door kits are sold separately
• Requires hardwired remote, not wireless
• Limited to propane fuel type only

Good fit if

• You need a direct replacement for a 15x15 inch RV water heater
• You travel frequently at high altitudes above 5,000 feet
• You want precise digital temperature control via a wired remote

Skip if

• You prefer electric or dual-fuel heating options
• You require a wireless remote controller
• You need a unit larger than 15x15 inches

Verdict: KINGRVER SUMMIT XT 65K BTU Propane RV Heater is a solid choice for high-altitude RV travelers who prioritize precise temperature control and standard 15x15 inch compatibility.

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