Best Water Heaters for RVs: Reliable on-Demand Heating for Your Next Trip

Direct answer: the best water heaters for RVs deliver reliable hot water on demand, work well at altitude, and fit your RV’s space. This guide highlights five top options for different needs—tankless propane, electric/DSI hybrids, and compact under-sink units. Ideal buyers include full-time RVers needing continuous hot water, weekend campers with limited installation space, and travelers at high elevations seeking altitude-ready performance. The table below compares these five selected products on key factors to help you choose quickly.

Product	Type	BTU / Capacity	Best For
ORBEK RV Tankless Water Heater	Tankless Propane	60,000 BTU	Families, daily showers	High-altitude ready
Suburban SW6D 6-Gallon RV Water Heater	Tank, Electric/DSI	6 gal tank	Budget setups, camping	OK with maintenance
VEVOR RV Tankless Water Heater	Tankless Propane	42,000 BTU	All-season use, quick heat	Altitude-ready
APUS RV Tankless Water Heater	Tankless Propane	68,000 BTU	High-demand showers	High-altitude ready
FOGATTI InstaShower 8 Plus	Tankless Propane	55,000 BTU	Retrofits, family use	High-altitude mode

Note: This article uses product features as provided and does not include ratings or warranties. Links in headings lead to Amazon product pages for quick reference.

ORBEK RV Tankless Water Heater

• Continuous hot water on demand with a 60,000 BTU propane burner. Hot water is produced only when requested, reducing propane usage.
• Oxygen-free copper heat exchangers and brushless DC fans support high-altitude operation and stable temperatures via staged combustion.
• Designed for standard RV openings; compatible with 15″ × 15″, 15″ × 18″, and 18″ × 18″ cutouts.
• Best for: families or frequent RV users who want endless hot water without storing heated water.

Caution: Verify your current cutout size before purchasing to ensure a proper fit. Propane-based systems require appropriate venting and installation considerations.

Suburban SW6D 6-Gallon RV Water Heater

• 6-gallon tank with porcelain lining for durability and residential-like longevity.
• Replaceable anode rod offers corrosion protection; the rod doubles as a drain for easier maintenance.
• Optional electric element broadens power options for campsite or generator use.
• Best for: RVers seeking a reliable, familiar-tank experience with flexible power options.

Caution: Tank-based systems require occasional maintenance; ensure compatible electrical sources when using electric heating.

VEVOR RV Tankless Water Heater

• 42,000 BTU tankless unit with segmented combustion for all-season performance.
• LED smart display and touch controls for easy temperature and power adjustments.
• Designed to adjust heat output with seasonal changes to maintain comfortable water temperatures.
• Best for: RVers who want straightforward operation with a clear status display.

Caution: Higher BTU rating is helpful, but consider your plumbing layout and gas supply capacity in your RV setup.

APUS RV Tankless Water Heater

• 68,000 BTU output with 3.9 GPM on-demand hot water and quick heat for long showers or multiple fixtures.
• Compact design (approximately 15″ footprint) and 12V DC power connection for RV installation.
• High-altitude readiness up to 9,800 feet; compatible with common RV door openings for retrofit use.
• Best for: RV families needing strong hot water output in a compact package.

Caution: Ensure your RV’s electrical and gas setup can support 68,000 BTU operation and verify opening sizes before purchase.

FOGATTI InstaShower 8 Plus RV Tankless Water Heater

• 55,000 BTU with 4+ minutes to 40+ minutes hot water supply depending on usage, designed for retrofit flexibility.
• High-altitude ready mode accommodates up to 9,800 feet; optional 13 × 13 or larger door openings for replacements.
• Staged combustion saves propane by preventing overheating in various seasons.
• Best for: families needing a retrofit-friendly tankless option with good hot-water duration.

Caution: Retrofit compatibility depends on door size and existing installation cutouts; verify opening dimensions before buying.

Buying Guide

What should you consider when choosing an RV water heater?

• Fuel type and energy source: Decide between propane, electric (DSI), or a dual-fuel/combination option based on campsite availability and generator capacity.
• Hot water demand: Match BTU output and GPM to your shower and chore patterns. Tankless units scale well for multiple users, while 6-gallon tanks suit smaller setups.
• Altitude performance: If you frequently travel to high elevations, choose models marketed as altitude-ready with staged combustion and proper venting.
• Installation footprint: Measure the door opening, cutout size, and available cabinet space to ensure a proper retrofit or new installation.
• Maintenance needs: Tank heaters with replaceable anodes simplify long-term maintenance; tankless units require routine checks of gas lines and venting.
• Electrical requirements: Electric heating options require adequate DC or AC power; confirm compatibility with your RV’s electrical system and wired circuits.
• Reliability and serviceability: Consider models with widely available replacement parts and straightforward maintenance procedures.

Frequently Asked Questions

• Do RV tankless water heaters work well at high altitude? Yes, many models include altitude-ready features and staged combustion to maintain stable temperatures.
• Is a 6-gallon RV water heater enough for a family? For light to moderate hot-water use, a 6-gallon tank can suffice, especially if you opt for a model with electric or DSI options.
• Can I install a tankless heater myself in an RV? Installation complexity varies by model; many require professional installation for gas lines and venting.
• Is it better to choose propane or electric for RV water heating? Propane offers independence from hookups and higher power for rapid heating; electric is convenient where grid power is reliable.
• What is the advantage of a tankless system over a tank in RVs? Tankless systems provide endless hot water on-demand and save space, while tanks offer simple maintenance and straightforward installation in some setups.
• How do I know if a heater fits my RV door opening? Check the door opening dimensions specified by the manufacturer and compare with your RV cutout.