Best Water Heaters for Trailers: On-Demand RV Heaters for Hot Showers
Finding the right water heater for a travel trailer means balancing power, altitude readiness, and installation flexibility. The following five models represent options across tankless and tank-based designs, with features tailored to RV use, high-altitude camping, and easy retrofits. This guide highlights performance, installation considerations, and reliability to help you choose a unit that delivers consistent hot water on the road.
| Product | Brand | Type | Key Feature |
|---|---|---|---|
| Ranein 65,000 BTU RV Tankless Water Heater | Ranein | Tankless, Propane, 12V | High altitude ready, multi-function controller |
| Poukaran 65,000 BTU RV Tankless Water Heater | Poukaran | Tankless, Propane, 12V | 65,000 BTU, high-altitude design |
| Suburban Advantage SW6DE | Suburban | Tank water heater, propane, 6 gal | Porcelain-lined, DSI electric option, corrosion protection |
| FOGATTI RV Tankless Water Heater | FOGATTI | Tankless, Propane, 12V | High-altitude mode, long-lasting hot water |
| BISELONG 1500W Under Sink Tank | BISELONG | Electric tank under sink | Compact installation, fast heating |
Ranein 65,000 BTU RV Tankless Water Heater
The Ranein 65,000 BTU RV Tankless Water Heater provides on-demand hot water with a 65,000 BTU rating and a 12V system. Designed for high-altitude use, it offers up to 9,800 feet altitude tolerance and a multi-function remote that displays gas usage, voltage, and water flow. It is engineered to replace older Suburban and Atwood tank heaters with compatible door sizes, and a door kit is available in multiple sizes to fit a range of RV cabinets. Its deep-fire row design improves heating efficiency, delivering hot water quickly when gas supply is ample. A 12.8 x 12.8 inch opening enables retrofit compatibility across many RVs.
Performance notes include a maximum claimed output of about 3.9 GPM, making it suitable for simultaneous showers or multiple fixtures in an RV. The absence of a water storage tank means continuous supply; however, proper venting and gas supply are critical for safe operation. Routine maintenance like cleaning the burner and inspecting connections help maintain efficiency and safety during extended trips.
Poukaran 65,000 BTU RV Tankless Water Heater
The Poukaran model delivers 65,000 BTU of heat with high-altitude readiness and a 12V DC system. It is propane-powered for heating, so it does not depend on campground electrical supply. Features include an oxygen-free copper heat exchanger and a brushless DC fan to optimize performance at higher elevations, reducing the risk of overheating. The unit supports dual water outlets for interior living needs and outdoor activities, making it a versatile choice for travelers who want flexible hot water access for baths, showers, and pet care at the campsite.
Considerations include ensuring adequate ventilation and clearance around the unit, as propane-fired RV heaters require proper exhaust management. While tankless designs minimize water storage concerns, installation may involve more complex fuel lines and mounting than traditional tank heaters. For high-altitude uses, verify compatibility with your RV’s existing gas system and door dimensions for a clean retrofit.
Suburban Advantage SW6DE
The Suburban SW6DE is a 6-gallon porcelain-lined steel tank water heater with direct spark ignition (DSI) and an Incoloy electric element option. The porcelain lining and replaceable anode rod provide corrosion protection, extending tank life in the RV environment. While primarily a tank-style heater, it supports flexible power options, including electric heating when campsite power is available or a generator is on-site. Its compact size fits many RV compartments while delivering reliable hot water for daily showers and dishwashing. Maintenance focuses on anode rod inspection and periodic drain-down to remove sediment buildup.
Installation considerations include door size compatibility and proper venting for propane operation. The DSI option offers quick ignition, but electrical heating requires a stable 120V supply. The combination of durability and maintenance-friendly features makes the SW6DE a straightforward upgrade for owners seeking a balanced, durable solution with long-term reliability in mobile settings.
Poukaran 65,000 BTU RV Tankless Water Heater (Black Door)
This Poukaran variant mirrors the 65,000 BTU capability with a black door and high-altitude readiness. It emphasizes the same on-demand hot water performance for RVs, including a high-efficiency heat exchanger, dual water outlets, and a robust ventilation approach to propane combustion. The black door design may appeal to RV owners seeking a specific aesthetic fit for their installation area. As with other tankless propane heaters, ensure proper gas supply, venting, and clearance around the unit for safe operation in mobile environments.
110V-120V 1500W Under Sink Tank 8 Gallon Heater
The BISELONG under-sink unit is a compact electric 8-gallon water heater designed for tight RV spaces. It uses a 1500W heating element with a 316 stainless steel tank and enamel coating to resist corrosion. The unit operates on standard 110V-120V power and includes a 44-inch power cord. It supports a simple install in tight cabinetry or RV kitchens, with a temperature range from 86 to 167°F for versatile hot water control. This model is a good option when camping where propane availability is limited or when you prefer electric heating as a backup to propane units.
FOGATTI RV Tankless Water Heater
The FOGATTI tankless model emphasizes high-altitude readiness with a 9,900-foot tolerance and staged combustion technology to prevent overheating as outdoor temperatures rise. The 55,000 BTU rating can deliver up to 2.9 GPM of hot water, which is suitable for a couple of showers or multiple tasks in a typical RV day. It includes a 12V DC system and a 15 x 15 inch door footprint, designed to replace common tankless and tank-type heaters. The unit is marketed as durable for frequent travel and consistent with RV electrical and gas constraints, though field installations require careful attention to venting and clearance for propane combustion.
Camco 50′ Heated Water Hose
While not a heater itself, the Camco heated water hose is a critical accessory for trailers in freezing temperatures. It provides freeze protection down to -20°F with a thermostat-controlled heating cable and a drinking-water-safe hose construction. This product complements any RV water heating setup by ensuring a reliable water supply in cold conditions, reducing the risk of line freezing during extended trips. The lead-free, NSF-certified hose ensures safety for potable water use, making it a practical addition to any trailer water system.
Buying Guide: Key Purchase Considerations
- Fuel type and power source: Tankless units typically rely on propane for heating but may require a stable gas supply, venting, and electrical support for ignition. Electric-only options suit camping spots with available shore power but have different capacity limits.
- Altitude readiness: RV life often involves high elevations. Choose models rated for high altitude to prevent overheating or under-heating when air is thinner.
- Hot water demand: If you shower multiple times per day or have a large RV crew, consider higher BTU output or dual-outlet designs to support simultaneous hot water needs.
- Tank vs. tankless: Tankless units save space and never run out of hot water (in theory) but require precise installation, venting, and ongoing maintenance. Tank options provide immediate hot water and are generally easier to retrofit in some RVs.
- Installation flexibility: Check cabinet door sizes, mounting dimensions, and the availability of compatible door kits for retrofit compatibility with popular RV brands.
- Durability and maintenance: Porcelain-lined tanks, replaceable anode rods, and corrosion protection extend the life of traditional tanks; for tankless models, consider burner longevity, heat exchanger quality, and routine cleaning needs.
- Safety and compliance: Ensure all units meet applicable CSA/UL safety standards for RV use and that proper venting and gas connections are installed by a qualified technician.
- Electrical considerations: For electric heaters, confirm the available amperage on your campsite or generator and ensure the wiring and breakers meet the unit’s requirements.