Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.11 Best 60 Gallon Electric Water Heater | Hot Water at Full Flow

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The Rheem RTEX-36 is a 36kW, 99.8% efficient electric tankless water heater that consistently delivers enough hot water for a 2,500-square-foot house with multiple showers running simultaneously. It uses an external adjustable thermostatic control and 3/4-inch NPT connections at the bottom. This model draws 150 amps and requires four dedicated double-pole 40A breakers with 8 AWG copper wire, so a 200-amp main service panel is highly recommended.

Real customers report that the Rheem RTEX-36 heats water to 140°F instantly, with a noticeably higher flow rate than competing 36kW units from Ecosmart. One reviewer upgraded from an Ecosmart that failed yearly and noted the Rheem has been perfectly reliable. Another user with a cold-climate home found the heat-up time slightly longer than a tank heater but praised the space savings and elimination of leak risk associated with traditional tanks.

The unit uses brass and copper heating elements for efficient heat transfer and corrosion resistance. Its silver and metallic housing has a compact wall-mount design, measuring just 17 inches wide by 17 inches high. The external temperature control knob is easy to read and adjust without removing the front cover.

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The Ecosmart ECO 36 is one of the most well-known electric tankless water heaters on the market, a 36kW unit that claims 99.8% energy efficiency. It features a digital output temperature display and self-modulating technology which adjusts power consumption based on the incoming water temperature and flow rate. The unit requires the same heavy electrical infrastructure as the Rheem: four 40-amp double-pole breakers and 8 AWG wiring.

Customer experiences over four to five years of use are overwhelmingly positive. One reviewer reported this unit has been running strong for four years, replacing an 80-gallon tank and providing endless hot water for a family of five. Another user noted the unit can handle one shower during Ohio winters and two simultaneously in summer, confirming that actual GPM depends heavily on ground water temperature. Several users highlight the importance of registering the product within 30 days for warranty coverage.

The unit’s white housing and compact 21-inch by 17-inch form factor makes it relatively easy to mount on a wall in a utility room or garage. The digital display shows the outgoing water temperature, which is adjustable via simple button controls. The unit ships with a 3/4-inch NPT water connection and includes rough-in plumbing brackets.

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The ThermoMate 36kW is a self-modulating electric tankless water heater with a rated flow of 8.8 GPM and 99.8% efficiency. It uses advanced self-modulating technology that adjusts energy use in real-time, which the manufacturer claims can save up to 60% on water heating costs vs. a traditional tank. The unit’s digital display and intuitive control knob allow 1-degree temperature adjustments between 80°F and 140°F.

Real customers with the 18kW variant of this unit reported a staggering reduction in their electric bill—from to per month—in Central Florida, while handling two concurrent showers and laundry. A home with hard water found the unit performed well with slightly slower warm-up but got very hot. The design separates the heating element from the water flow, making maintenance significantly easier than integrated-element designs.

This unit requires four dedicated double-pole 40A breakers with 4 x 8 AWG copper wire and a minimum 200-amp main service. The robust metal housing measures just 12.99 inches wide by 18.31 inches high by 4.41 inches deep. The anti-freeze protection and automatic dry-fire shutdown add an extra layer of safety for homeowners in colder climates.

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The Mizudo 36kW (model EQUIK 36) is an electric tankless water heater with a standout flow rate of up to 8.7 GPM, enough to simultaneously supply 5-6 points of use. It claims 98% high thermal efficiency and uses a copper cup heating element for efficient thermal transfer. The unit’s smart system fine-tunes power 20,000 times per second to maintain temperature stability within ±1°F, adjustable via LED touch display between 86°F and 140°F.

Customer feedback is mixed but informative. One user praised the compact design and instant hot water for a single sink or light use, noting the 2.6 GPM performance was consistent. Another buyer warned that the unit failed in an unheated crawlspace in the Pacific Northwest due to freezing, a critical installation limitation for electric tankless heaters. A third customer purchased the unit in June, installed it in September, and reported a burst fitting in December that flooded a shop, causing in damage.

This unit requires four 40-amp double-pole breakers and 4 sets of 8 AWG wiring, plus a 3/4-inch NPT water connection. Its white and compact dimensions of 17.1 inches high by 18.5 inches wide by 3.7 inches deep make it one of the slimmest high-power models available. The LED display with error codes is helpful for troubleshooting.

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The Stiebel Eltron Tempra 36 Plus is a 36kW electric tankless water heater built in Germany, known for its solid construction and exclusive Advanced Flow Control system that automatically adjusts flow to maintain the set temperature. The unit uses self-modulation energy technology and features a digital display for precise temperature setting. It requires three 50-amp double-pole breakers instead of four 40-amp ones, a slightly different electrical configuration than the Rheem and Ecosmart options.

Owner experiences highlight the quality and longevity of this unit. One customer replaced the same Stiebel Eltron model after 14 years of service, with the new unit performing excellently for four bathrooms. Another user reported that the unit produces 100°F+ hot water in 1-2 minutes compared to 5-7 minutes for a 75-gallon tank heater. However, one buyer noted a significantly high electric bill (over ) and inconsistent temperature, eventually returning to a tank heater.

The Tempra 36 Plus measures 16.63 inches wide by 14.5 inches high. It uses a copper heating system encased in a white metal housing. The unit’s compact size and German engineering are often cited as its main selling points, but potential buyers should be aware that the unit may not be compatible with solar+battery setups due to its high instantaneous power draw of 10-15 kW.

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The WINTEMP WM27V Plus is a 27kW tankless electric water heater that offers a unique value proposition: built-in WiFi control via the Smart Home and Tuya Smart apps. Rated at up to 6.5 GPM, this unit is designed for 2-4 points of use in a mid-sized home. It uses self-modulating technology and a digital temperature display, and is ETL certified. The electrical requirement is three 40-amp double-pole breakers with 3 sets of 8 AWG wiring.

Customer feedback is very positive for this entry-level high-power model. A review of the 27kW version noted it handled a washer, dishwasher, and shower simultaneously with no temperature fluctuation in 50-60°F incoming water. Another user praised the all-metal steel build, which feels more durable than cheaper plastic alternatives. The WiFi functionality allows remote temperature monitoring and control, as well as real-time water and electricity usage tracking.

The unit measures 15.9 inches high by 13 inches wide by 4.2 inches deep, offering a space-saving footprint. The internal cast-aluminum heating system is designed for efficient heat transfer. A minor complaint from one user was the lack of a certification logo on the product itself, though the unit ships with ETL standards listed.

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The Rinnai RX199iN is a condensing tankless water heater that runs on either natural gas or propane, delivering a massive 11.1 GPM flow rate with a UEF efficiency rating of 0.98. It is not an electric unit, but it earns a place on this list for homeowners with gas hookups who want the highest possible flow rate without the massive electrical infrastructure demands of a 36kW electric unit. The Versa Vent system allows indoor or outdoor installation.

Real-world owner experiences are excellent. One customer reported the unit has been running for 6 months in a 3-bedroom home with a family of 5, handling multiple showers with no pressure or temperature drop. Another reviewer noted it replaced their 11-year-old Rinnai, and the plumber installed it in just hours. The quiet operation is frequently praised, and the unit’s compact suitcase-like size (18.5 inches wide by 30.11 inches high) saves significant floor space.

The RX199iN includes a Smart Sense gas control system that automatically detects the fuel type (propane vs. natural gas). It also includes a Quick Flush feature for simplified maintenance and the ability to connect to the Rinnai Central App for WiFi control and troubleshooting. Professional installation is highly recommended, and Rinnai provides a dedicated installer locator on their website.

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The Suburban Advantage SAW6DE is a 6-gallon direct-fit RV water heater designed to replace older Atwood and Dometic units without sidewall modifications. It uses a 10,000 BTU LP gas burner with a direct spark ignition (DSI) system and includes an Incoloy electric element for 120V operation. The recovery rate is 14.14 gallons per hour on gas, 6.10 on electric, and 20.24 using both simultaneously.

Customer experiences highlight the true “direct fit” nature of this unit. One reviewer successfully replaced a leaking Atwood unit in a 2016 Chaparral 5th wheel with no cut-out modifications. Another user noted the mounting bracket folds out via perforations but the instructions were lacking. One unit arrived with a bent front shroud that required manual correction, though the fit and function were otherwise perfect.

The tank is porcelain-lined steel with a replaceable anode rod that doubles as a drain, simplifying maintenance. The unit weighs 41 pounds and measures 17.5 inches wide by 14.25 inches high. It is an ideal upgrade for RV owners looking for a durable residential-style tank that fits perfectly into existing 6-gallon cutouts.

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The CAMPLUX 6-gallon RV water heater offers true heating flexibility with propane (12,000 BTU), electric (1440W), or hybrid modes. This allows RVers to run propane when boondocking, switch to electric at RV parks to save fuel, or combine both for fast recovery when multiple people need hot showers. The unit is designed as a direct fit for standard 13 x 13-inch cutouts with a 15 x 15-inch exterior door.

Customer feedback is generally positive but highlights installation hurdles. One user noted the unit works wonderfully but was a lot of work converting from a gas-only system to gas/electric/both. Another user emphasized that you should absolutely check the physical dimensions because the unit was hard to install when the cutout was slightly off. The interior-mounted control panel allows mode and temperature adjustments without stepping outside the RV.

The tank is porcelain-lined steel with an integrated anode rod for long-term corrosion protection, essential for full-time RVers. The unit is CSA certified with safety features including dry-boil protection and over-temperature protection. It measures 15.2 inches wide by 15.2 inches high and weighs 35 pounds.

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The Suburban ST-60 is a tankless RV water heater rated at 60,000 BTU, offering endless hot water without the weight or bulk of a storage tank. It features enhanced flame-out protection that instantly cuts the gas supply in response to low propane pressure, a scald protection kill switch that maintains a maximum water temperature of 131°F, and a child lock that prevents outlet temperatures from exceeding 113°F. Freeze protection activates in low temperatures when power and propane are available.

Real customer experiences are very positive. One reviewer replaced a leaking Atwood tank heater and reported endless hot water reaching both the bathroom and kitchen quickly. Another user installed the unit in about an hour and confirmed it heats water in 5-9 seconds. The unit’s digital control center must be hardwired into the RV’s 12V system, requiring some additional wiring. The tankless design saves significant weight compared to a traditional tank, weighing just 21 pounds.

A notable caution from a buyer is that not all ST-60 units are identical—one customer received a variant (5482A) that was incompatible with their OEM 5382 wiring, causing an EC error. The exterior door (model 6285APW or 6285AEB) is sold separately, which may catch some buyers off guard.

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The Camco Kuuma Marine 6-gallon electric water heater is a simple, reliable entry-level RV and marine replacement heater. It runs on standard 120V AC or 12V DC power with a 1500W heating element. The unit is designed as a direct swap for older 6-gallon units, with the same 16-inch by 13.6-inch dimensions to fit into existing cutouts without modification. It features a pilot light window and the maximum temperature reaches 210°F.

Customer feedback is very specific to RV and boat owners. One reviewer used it to replace an old rusted unit in a 1995 RV and confirmed the dimensions were identical, with the plumbing fittings lining up perfectly. Another user installed it in a 1978 GMC Kingsley 26-foot motorhome and reported outstanding fit and function. A boat owner found it was a “perfect fit” for a 350 Rinker. One buyer did note that the construction felt like “China junk” and communication was slow, but the unit functioned.

The unit’s simplicity is its main advantage—no complex electronics, no gas lines, just a standard 120V plug-in or 12V DC connection. The wall-mount design includes a pilot light window for visual status indication. Buyers should be aware that the 1500W element means a slower recovery time compared to gas or hybrid options, but it’s perfectly adequate for small RVs and boats.