Water Heaters

Hot Water on the Road or Water — Why Your RV & Marine Water Heater Matters

Whether you're scrubbing dishes after a trailside dinner or rinsing off after a long day on the water, a dependable water heater is one of the most essential — and most overlooked — systems in any RV or boat. Unlike residential units, RV and marine water heaters are purpose-built to handle the unique demands of mobile life: vibration, varying fuel sources, tight installation spaces, and exposure to the elements. Choosing the right one can be the difference between a comfortable adventure and a frustrating cold-water surprise.

Types of RV & Marine Water Heaters

Tank-style water heaters are the most traditional option. RV water heaters of this type store a set volume of heated water — typically between 6 and 16 gallons — keeping it ready on demand. They're straightforward to install, easy to replace, and come in a wide range of capacities to suit solo travelers and families alike.

Tankless water heaters heat water on demand rather than storing it, which means you never run out mid-shower. They're also more compact, freeing up valuable storage space in your rig or vessel. Because they only fire up when water is flowing, tankless models tend to use less propane than their tank-based counterparts — a meaningful advantage on longer off-grid trips.

Hybrid and dual-fuel models offer the flexibility to switch between propane and electric power depending on your situation. When shore power is available at a campsite or marina, electric operation runs quietly with no emissions. When you're off the grid, propane keeps the hot water flowing. This adaptability makes dual-fuel units a popular choice for full-timers and extended cruisers.

Key Considerations When Shopping for an RV or Marine Water Heater

• Fuel source: Propane heats water quickly and works without shore power, while electric units run silently and are ideal at campgrounds or marinas with hookups.
• Capacity and flow rate: Tank models are rated in gallons; tankless units are rated by BTU output or gallons per minute (GPM). A standard RV shower uses roughly 2 gallons per minute, so size accordingly.
• Climate and freeze protection: If you travel or live aboard in cold climates, look for units with built-in freeze protection to prevent costly damage to your system.
• Installation footprint: Measure your existing opening before purchasing — replacing a tank-style unit with a tankless model may require minor modifications to the sidewall cutout or surrounding cabinetry.
• Corrosion resistance: Marine environments are especially harsh. Look for units with corrosion-resistant tanks, stainless steel components, and marine-rated certifications for onboard installations.
• Safety features: Temperature and pressure relief valves, automatic shut-off, and oxygen depletion sensors are critical safety components to verify before purchasing.

Maintenance Tips to Extend Your Water Heater's Life

Routine maintenance goes a long way. Flushing sediment from tank-style units prevents corrosion and restores heating efficiency. Anode rods, which attract corrosive elements in the water to protect the tank itself, should be inspected and replaced periodically. Always winterize your system properly before storage — draining the tank and treating water lines with antifreeze prevents freeze damage that can crack tanks and fittings.

Top Brands in RV & Marine Water Heaters

Camco is a trusted name in the RV and marine space, offering an extensive lineup of water heater parts, accessories, and maintenance products. From temperature and pressure relief valves to anode rods, drain plugs, tank rinsers, and heating elements, Camco provides the components that keep your water heater system running reliably for seasons on end.