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 65 Gallon Electric Water Heater | Endless Hot Water

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The Rheem RTG-95DVLN-3 occupies the sweet spot of the tankless gas world: high enough flow to cover a 2–3 bathroom household without requiring the massive electric service that a tankless electric heater demands. Its 199,900 BTU natural gas burner delivers 9.5 gallons per minute at a 40°F rise, which means two showers, a dishwasher, and the washing machine can run simultaneously without noticeable temperature sag. The non-condensing design keeps the price lower than condensing models, though it requires standard Category III venting rather than PVC.

Owners consistently report DIY-friendly installation for anyone comfortable with gas line work and basic venting — the unit shares the same footprint and connection layout as earlier Rheem RTG models, making a straight swap possible in under three hours for experienced DIYers. The hot-start programming eliminates the cold-water sandwich effect between back-to-back showers.

The main compromise is the lack of a built-in recirculation pump. You’ll need to add a separate pump and return line if you want instant hot water at distant fixtures. And while the 9.5 GPM is generous, the unit cannot match the sheer flow of the larger Rinnai RXP199iN for houses with three full bathrooms or large soaking tubs.

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The Rinnai RXP199iN is the flagship of this list: a condensing gas unit that delivers up to 11.1 gallons per minute with an ultra-high UEF of 0.98. That efficiency rating means nearly all the gas energy goes into heating water rather than up the flue. It can serve up to seven fixtures simultaneously, making it the only unit here that comfortably covers a 4-bedroom home with two full baths, a kitchen, and a laundry room running at the same time.

The built-in Smart-Circ recirculation pump learns your household’s usage patterns and cycles the water to minimize wait time without wasting energy. The unit auto-detects whether it’s connected to natural gas or propane, eliminating the need for a conversion kit. Installation is more involved than a non-condensing heater because condensate drainage must be routed to a floor drain or condensate pump, but the payoff is slightly lower operating costs.

Owner feedback is overwhelmingly positive, with many replacing 40–50 gallon tanks and reporting that they never run out of hot water even with grandkids visiting and all appliances running. The recirculation pump is slightly noisier than some owners expected, and the Rinnai Controlr app for smart monitoring is sold separately. For a house that demands maximum hot water output with minimal energy waste, this is the unit to beat.

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The Rheem Prestige is a condensing gas tankless unit that offers nearly identical flow (9.5 GPM) to the RTG-95DVLN-3 but adds internal water and gas leak detection sensors that automatically shut down the unit and display an error code. That’s a meaningful safety feature for homes where the water heater sits above finished living space. The condensing design also means it can vent with inexpensive Schedule 40 PVC pipe, simplifying installation for DIYers who want to avoid metal venting.

Owners praise the quiet operation and the unit’s ability to deliver 50-minute showers without any cold interruption. The Prestige is heavier than the non-condensing RTG — 77 pounds vs. 46.5 pounds — so you’ll need help mounting it on the wall bracket. The warranty includes a good track record of Rheem tech support helping diagnose status lock errors over the phone.

The biggest complaint centers on the packaging: the unit is expensive and fragile, yet the shipping boxes are thin and often arrive damaged. A number of owners received dented units on the first delivery and had to go through a return exchange. If you order this unit, inspect the box thoroughly before signing.

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The Stiebel Eltron Tempra 36 Plus is the premium electric entry on this list, designed for homes that have natural gas unavailable but still want endless hot water. Its self-modulating Advanced Flow Control automatically adjusts power output to match incoming water temperature and flow rate, preventing the temperature swings that plague basic electric tankless units. The digital temperature display allows precise adjustment between 86°F and 140°F.

The unit is compact at 16.6 by 14.5 inches, weighing only 19 pounds. It can be mounted in tight spaces, freeing up floor space for storage. Owners coming from 75-gallon tank heaters report that the Tempra 36 delivers 100°F+ hot water in 1–2 minutes rather than the 5–7 minutes they were used to. The build quality is excellent, consistent with Stiebel Eltron’s reputation for German engineering.

The catch is the electrical requirement: it needs three 50-amp double-pole breakers, consuming six panel slots. Many older homes will require a full panel upgrade. Some owners also report that the unit pulls 10–15 kW for a single shower and up to 30 kW for a bath, which can translate into noticeably higher electric bills compared to a gas tankless.

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The EcoSmart ECO 36 is the electric tankless unit that balances performance and cost more evenly than most. With 36 kW of power and a peak flow of 6 GPM, it supports a single shower plus a sink or two without trouble. Its 99.8% energy efficiency means virtually all the electrical energy converts to heat, and the self-modulating technology adjusts power use in real time based on water demand — you never waste electricity heating water you aren’t using.

Owner reports after 3–4 years of use are generally positive, with families of five reporting endless hot water and no waiting between uses. The installation does require four 40-amp double-pole breakers (eight panel slots), so verify your panel capacity before purchasing. Several owners note that copper pipes in older homes lose heat between the heater and the shower; setting the temperature to the max 140°F compensates for this.

The warranty registration is critical — owners who failed to register within 30 days had motherboard replacement issues denied, with the unit only powering 2 of its 4 heating elements. Also, the unit’s maximum flow drops sharply in cold climates where the incoming water temperature is below 40°F. In northern winters, a 6 GPM unit might only deliver enough flow for one moderate shower.

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The Rinnai RUCS65IN is a non-condensing natural gas tankless heater that delivers 6.5 gallons per minute, sufficient for a family of three to four running one shower and one sink or appliance simultaneously. Its 130,000 BTU burner is less powerful than the larger Rheem and Rinnai models, but the simplicity of the non-condensing design means fewer potential failure points and a lower upfront cost.

Professional installation is strongly recommended for this unit because the venting, gas line sizing, and condensate drainage (even for non-condensing units) require careful setup. DIY owners report that the installation cost about –300 in parts for the conversion. The unit includes a hot-water controller that allows precise temperature output down to 1°F increments.

The main limitation is flow rate at maximum temperature rise. If your incoming groundwater drops to 40°F in the winter, the unit may only deliver 4.5 GPM at 120°F output, which is adequate for a single shower but not simultaneous use. Owners with low-flow faucets sometimes report difficulty getting hot water in the kitchen because the flow rate doesn’t trigger the burner. A recirculating model or adding a small electric booster at the far tap can resolve this.

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The GE 30-Gallon Electric Water Heater is a straightforward tank solution for smaller homes. Its twin 5500W heating elements deliver a first-hour rating of 53 gallons, which means you get 53 gallons of hot water in the first hour of heavy use — not just the 30 gallons the tank holds. That recovery performance makes it functional for back-to-back showers for a family of 1–3 persons without the complexity or electrical demand of a tankless system.

Installation is straightforward for a handyman or plumber: standard 240V 30-amp wiring and ¾-inch NPT water connections. The stainless steel tank and long anode rod provide 10-year tank protection, and the adjustable thermostat lets you dial the storage temperature between 90°F and 150°F. The unit is heavier than expected at 101 pounds, but most installers can manage it with a helper or water heater dolly.

The only notable issue reported is with the wire connectors included in the junction box. Several owners found the clip connectors unsuitable for 10-gauge wire — they came loose during installation, leading to arcing at the breaker panel. Owners recommend discarding the included connectors and hard-wiring with properly torqued wire nuts. Otherwise, the unit delivers consistent performance year after year.

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The Ranein 65,000 BTU tankless water heater is specifically designed for RV and mobile living, not whole-home residential use. Its compact form fits standard RV cutouts and replaces 6/10/12-gallon tank heaters found in campers and motorhomes. The 65,000 BTU burner heats water instantly on demand, delivering up to 3.9 gallons per minute at a max of 124°F — enough for a long, uninterrupted shower in the RV.

The thermostatic mixing chamber maintains consistent temperature even when water demand changes, preventing the cold bursts common with early RV tankless heaters. It includes a circulating water pump that reduces hot water waste, plus an anti-freeze function that activates below 42.8°F to protect internal components. The remote display provides real-time visibility into gas consumption, voltage, and water flow.

Full-time RV owners report taking 40-minute showers with zero temperature fluctuation after replacing a leaking 6-gallon tank. The unit does require careful installation: the T&P valve can leak if incoming water pressure exceeds 60 PSI, and the 3.9 GPM flow rate demands a high-volume propane regulator. The included pet-friendly shower kit is a nice bonus for washing gear or dogs at the campsite.

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The Dometic WH-10GEA is a hybrid RV water heater that combines a 10-gallon tank with both LP gas (10,000 BTU) and 12V electric heating. The 10-gallon capacity is 66% larger than the standard 6-gallon RV tank, meaning longer showers without running out of hot water. The aluminum tank requires no anode rod, reducing maintenance, and the lightweight construction (22 pounds) makes it feasible for a single person to handle during installation.

The electronic-ignition burner lights automatically, eliminating the need for a standing pilot. The pre-installed winterization bypass kit simplifies the process of draining and protecting the unit during storage. It is a direct replacement for many Atwood 10-gallon models, with identical mounting holes and plumbing connections for an easy swap.

Some owners note that the insulation on this unit is relatively thin — the cabinet around the heater can run 15°F warmer than the ambient temperature due to heat bleed. This isn’t a safety concern but does represent some heat loss. Also, the inlet/outlet position changed slightly compared to older Atwood units, meaning the existing bypass valve may not fit and will need replacement or an adapter.

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The Reliance 20-Gallon Electric Water Heater is a specialized unit for manufactured homes, mobile homes, and small cabins, not a replacement for a standard residential tank. Its 120V/1650W electrical requirement is unique — most electric water heaters require 240V, so this unit can plug into a standard household outlet circuit. That makes it the only option here for structures without 240V service.

In a mobile home or small RV conversion, the 20-gallon tank provides enough hot water for roughly 15-minute showers at a modest 1 GPM flow rate. Owners of skoolie conversions and older mobile homes report reliable performance with easy installation. The glass-lined steel tank holds up reasonably well when drained annually to remove sediment.

The downsides are the small capacity and slow recovery. At 1650W, the recovery rate is slow — you’ll need to space out showers by 30–45 minutes. Some units arrive with cosmetic dents or a broken drain valve, so inspect the delivery carefully. The 3/5-star reviews often cite shipping damage rather than performance issues.

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The Dometic WH-6GEA is the entry-level RV water heater for those who want a straightforward replacement for an existing 6-gallon tank unit. Its aluminum tank requires no anode rod, eliminating one of the most common maintenance items on traditional glass-lined tanks. The gas burner (10,000 BTUs) heats water quickly, and the 12V electric element provides backup heating when shore power is available but you want to conserve propane.

Installation is genuinely DIY-friendly. Multiple owners report watching a YouTube video and completing the swap in an afternoon, saving hundreds over a dealer service fee. The unit is an exact replacement for many Atwood models, with the same mounting holes and plumbing layout. The compact dimensions (16 × 16 × 14 inches) fit into tight RV compartments with no modification.

The small 6-gallon capacity means showers will be short — you’ll need to use the Navy shower method (wet, shut off, soap up, rinse) to get a full wash from one tankful. A few owners reported units that failed after a year due to control board issues, and the aluminum tank, while corrosion-resistant, cannot be repaired if a leak develops — the entire unit must be replaced.