Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.9 Best 6 Gallon RV Water Heater | Smarter 6-Gallon RV Pick

Check Price on Amazon

The Suburban SW6DE is the gold standard for RV tank water heaters. Its porcelain-lined steel tank withstands corrosion far longer than the aluminum tanks found in older Atwood units, and the replaceable anode rod that doubles as a drain makes annual maintenance straightforward. The direct spark ignition (DSI) eliminates the standing pilot light, saving propane when the heater isn’t in use.

With 12,000 BTU gas heating and an optional 1440W Incoloy electric element, the SW6DE achieves a recovery rate of 10.1 gallons per hour on gas alone and 6.1 GPH on electric. That means the 6-gallon tank reheats in roughly 35 minutes on gas, which is fast enough for back-to-back showers if you space them out. The cutout dimensions of 12.75″ x 12.75″ fit the standard Suburban opening found in most modern travel trailers.

Owners report this unit as a direct, hassle-free replacement for older Suburban models. The few complaints center on the pressure relief valve occasionally leaking after several months, but that’s a quick field replacement. For the balance of price, build quality, and hybrid performance, this is the unit most full-time RVers should start with.

Check Price on Amazon

Designed specifically to replace competitive 6-gallon aluminum tank heaters — most often the older Atwood units found in many RVs built before 2015. The SAW6DE slides into the existing cutout without requiring sidewall modifications, interior cabinet depth changes, or major plumbing rework, which is a huge time saver during an upgrade.

Its porcelain-lined steel tank brings residential-grade corrosion resistance to a form factor that originally shipped with an aluminum vessel. The 10,000 BTU gas burner and 1440W electric element combine for a total recovery rate of over 20 gallons per hour when both modes run simultaneously. That’s enough capacity for a family to take three or four showers in quick succession without running out.

Some buyers noted the mounting bracket requires bending out via perforations (instructions are minimal) and the front shroud can arrive slightly bent from shipping. The unit also needs about 2.5 inches of clearance for water line connections on the back side, so check your available depth before ordering. Once installed, though, the performance is a clear step above any aluminum-tank alternative.

Check Price on Amazon

CAMPLUX enters the market with a true hybrid propane-electric system that lets you toggle between gas, electric, or both via an interior-mounted control panel — no need to step outside to adjust settings. The porcelain-lined steel tank with an integrated anode rod provides solid corrosion protection for full-time travelers who put on serious miles each season.

The unit is engineered as a direct replacement for most Suburban and Dometic/Atwood 4-6 gallon models, fitting into the standard 13″ x 13″ cutout with a 15″ x 15″ exterior door. The 12,000 BTU gas burner and 1440W electric element give it a combined recovery rate around 10.1 GPH, matching the Suburban SW6DE’s gas-only performance. That parity puts it in the top tier for recovery speed.

Customer feedback highlights that installation can be involved when converting from a gas-only RV to a hybrid system, especially running new 12V DC ignition wiring and a 120V AC supply. A few reports note the unit didn’t function out of the box, though CAMPLUX’s support team addressed those cases. For anyone rebuilding a camper from scratch, the interior panel control is a genuinely nice convenience.

Check Price on Amazon

The KINGRVER CT6 offers one-touch temperature presets at 104°F, 122°F, and 140°F — a rare level of granularity for an RV-tank heater. You can toggle between gas-only, electric-only, or combined operation directly from the wire controller, which makes seasonal adjustment simple: lower temps in summer for faster recovery, higher temps in winter for comfortable showers.

Its 12,000 BTU gas burner and 1440W electric element provide the same dual-fuel flexibility as the CAMPLUX and Suburban units, but KINGRVER emphasizes installation support with 24/7 customer service and a quick installation guide included in the box. The dimensions of 21″ x 12.8″ x 12.8″ fit most 4-6 gallon cutouts, though you’ll need at least 3 inches of additional depth for plumbing connections.

Negative reviews center on reliability — reports of the unit flashing error codes and refusing to heat after a month of light use are concerning, though customer support has been responsive in sending replacements. If you get a good unit, the temperature presets and interior controller make this one of the most user-friendly options on the market.

Check Price on Amazon

The Reliance 6 SOMS K is an electric-only 6-gallon unit that makes an excellent supplementary water heater for RVs that already have a propane-based system. Running on a standard 120V AC supply, its 1650W heating element provides a steady supply of hot water without consuming any propane — ideal for full-hookup campgrounds where you want to conserve tank fuel for cooking and heating.

Owners report it delivers enough water for two quick showers and fits snugly under a sink or in a small cabinet. The 14.12″ x 14.12″ footprint is compact, and the unit uses standard 1/2-inch NPT connections. However, this model lacks an adjustable thermostat — the temperature is factory-set — and the pressure relief valve has a tendency to weep until the tank reaches full operating temperature.

Packaging is a known weak point: the hot water outlet threads arrive damaged on some units because there are no thread protectors during shipping. Check the inlet and outlet before installation. The unit weighs about 30 pounds empty but over 100 pounds when filled, so sturdy mounting is essential. For RVers who primarily stay at hookup sites, this is a clean, propane-free solution.

Check Price on Amazon

Stiebel Eltron brings German engineering to the mini-tank category with the SHC 6. Its 1300W heating element is slightly less powerful than the 1500W+ competitors, but the glass-lined steel tank offers excellent resistance to rust and sediment buildup. The unit measures 15″ x 20.5″ — taller than most RV-specific units — so it’s better suited for cabins, garages, or RVs with ample vertical cabinet space.

Buyers praise its quick heat-up time and the ability to turn it off when not in use, which saves energy between trips. A plumber who installed one noted he was using the same model as a preheater for his shower in a home setting, which speaks to the build quality. The 6-year tank warranty against leakage is among the longest in this category.

The caveat is the 1300W output: at 120V, recovery is slow — expect to wait at least 45 minutes for a full tank recovery. It also requires 3/4-inch NPT connections rather than the 1/2-inch standard on many RV units, so you may need adapters. For a permanent installation where patience between showers is acceptable, the Stiebel Eltron is built to last a decade.

Check Price on Amazon

The ThermoMate ES600 is a budget-friendly entry into electric point-of-use water heating for RVs. Its 1500W Incoloy-800 element is corrosion-resistant and more efficient at high temperatures than copper elements, and the porcelain-enamel glass inner tank coating adds a second layer of rust protection. The adjustable thermostat lets you set temperatures between 90°F and 150°F.

At 16.14 inches tall, this unit has a low-profile design that fits under most RV sinks. It requires hard-wired installation (a power cord is included for optional use) and a 15-amp circuit breaker. The UL listing covers ASME, ANSI, and CSA-approved T&P relief valve, and the high-temperature limit protection adds safety for unattended operation in a camper or vacation cabin.

Buyers report inconsistent temperature readings — likely due to stratification in the tank or an imprecise sensor — and note it’s not suitable for shower use. The 1.5-gallon recovery is fast enough for hand washing and dish rinsing, but the 6-gallon tank won’t sustain a full shower. Think of it as a dedicated kitchen or bathroom sink heater for intermittent use.

Check Price on Amazon

GE’s 6-gallon mini-tank electric heater is positioned as a versatile unit suitable for kitchens, bathrooms, barns, garages, cabins, and RVs. The stainless steel heating element resists rust and corrosion, and the adjustable thermostat via a simple knob is intuitive. Installation uses standard 1/2-inch NPT connections for wall or floor mounting.

Buyers who installed this in an outdoor kitchen RV setup report that it barely fits under the sink but works perfectly once in place. Another user replaced a cheap off-brand unit that leaked after a few months and found the GE installed without leaks and delivered consistent hot water. The 140°F maximum output is warm enough for comfortable washing without the risk of scalding at the tap.

The main consideration is that the instructions warn about draining the tank during freeze conditions or long-term non-use to prevent harmful gas buildup — a mandatory step for winter RV storage. Professional installation is recommended. At its price point, it’s a reliable electric-only option for RVers who need hot water in multiple locations and prefer a trusted appliance brand.

Check Price on Amazon

The Furrion tankless unit is a different animal from the traditional 6-gallon tank heaters — it provides endless hot water on demand with a 60,000 BTU propane burner and a 2.4 GPM flow rate. Its Vortex technology maintains consistent temperature even when ambient temperatures drop to 32°F, and the dual-sensor safety system auto-shuts the burner if temperatures exceed safe limits.

Users who replaced 6-gallon tank systems report the Furrion uses about half the propane of a standard 10-gallon tank heater while enabling 30+ minute showers. The door is designed as a replacement for Suburban and Atwood 10-gallon models with an 18.11″ x 18.11″ opening. However, installation is more involved — it requires building a mounting box, potentially a new propane regulator, and PEX tools for plumbing connections.

The critical weakness is freeze vulnerability: copper components inside the unit can burst if water is trapped during freezing weather, and Furrion’s warranty explicitly excludes freeze damage. This means thorough seasonal blowout procedures are mandatory for cold-climate RVers. The Furrion is a premium convenience upgrade, but it demands careful maintenance that a passive 6-gallon tank does not.