Hot showers every time come down to picking the right water heater for your home. Tankless electric heaters like Rheem’s 18kW model or EcoSmart ECO 11 deliver steady, energy-saving hot water on demand.
Prefer gas instead? Rinnai’s RX199iN powers multiple showers at once with smart fuel use and simple venting, while compact units like Rheem 3.5kW or plug-and-play GE models fit tight spaces and heat quickly with minimal fuss.
| Rheem 18kW 240V Tankless Electric Water Heater Gray |
| Best Whole-Home Electric | Power Source: Electric (240V) | Installation Type: Wall-mounted | Maximum Flow Rate: 4.4 GPM | VIEW LATEST PRICE | Read Our Analysis |
| Rinnai RX199iN Tankless Water Heater Indoor/Outdoor |
| Top Gas Efficiency | Power Source: Gas (Natural gas or propane) | Installation Type: Indoor/outdoor with venting system | Maximum Flow Rate: 11.1 GPM | VIEW LATEST PRICE | Read Our Analysis |
| EcoSmart ECO 11 Electric Tankless Water Heater |
| Best Point-of-Use Electric | Power Source: Electric (240V) | Installation Type: Wall-mounted | Maximum Flow Rate: 3.1 GPM | VIEW LATEST PRICE | Read Our Analysis |
| Rinnai RXP199iN Tankless Water Heater with Pump |
| Smart Recirculation System | Power Source: Gas (Natural gas or propane) | Installation Type: Wall-mounted | Maximum Flow Rate: 11.1 GPM | VIEW LATEST PRICE | Read Our Analysis |
| Tankless Electric Water Heater 110V 3000W |
| Compact Under-Sink Heater | Power Source: Electric (110V) | Installation Type: Under sink (vertical only) | Maximum Flow Rate: 0.5 GPM (not suitable for showers) | VIEW LATEST PRICE | Read Our Analysis |
| Portable 1800W Immersion Water Heater with Display |
| Portable Immersion Heater | Power Source: Electric (120V) | Installation Type: Portable immersion (submersible) | Maximum Flow Rate: Not specified (immersion heater) | VIEW LATEST PRICE | Read Our Analysis |
| Immersion Electric Water Heater 2000W with LCD |
| Fast Heating Travel Heater | Power Source: Electric (110-125V) | Installation Type: Immersion (submersible) | Maximum Flow Rate: Not specified (immersion heater) | VIEW LATEST PRICE | Read Our Analysis |
| 110V Tankless Electric Water Heater 3000W Compact |
| Compact 110V Electric | Power Source: Electric (110V) | Installation Type: Under sink wall-mounted | Maximum Flow Rate: Not specified (compact under sink) | VIEW LATEST PRICE | Read Our Analysis |
| GE 10 Gallon Plug and Play Electric Water Heater |
| Easy Plug-and-Play | Power Source: Electric (120V) | Installation Type: Tank (plug and play) | Maximum Flow Rate: Not specified (10 gallon tank) | VIEW LATEST PRICE | Read Our Analysis |
| Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater |
| Space-Saving Point-of-Use | Power Source: Electric (120V) | Installation Type: Wall-mounted (upright) | Maximum Flow Rate: Not specified (point-of-use low flow) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Rheem 18kW 240V Tankless Electric Water Heater Gray
The Rheem 18kW 240V Tankless Electric Water Heater, Gray, stands out as an excellent choice for those needing a reliable and efficient hot water source for mid-sized homes or single showers, especially within the Midwest. This model offers a continuous flow of hot water, adjusting power according to demand, which smartly cuts energy use up to half. It is compact, wall-mounted, and doesn’t need venting, saving space and installation hassle. With a digital thermostat showing precise temperatures and durable copper heating elements, it handles water pressure well. Users appreciate its efficiency and easy setup, making it a trusted pick.
- Power Source:Electric (240V)
- Installation Type:Wall-mounted
- Maximum Flow Rate:4.4 GPM
- Temperature Range / Max Temperature:Up to 140°F
- Energy Efficiency / Technology:99.8% efficient, self-modulating power
- Control / Display Type:External digital thermostat with LED display
- Additional Feature:Self-modulating power adjustment
- Additional Feature:Durable copper heating elements
- Additional Feature:Threaded 3/4 inch NPT connections
Rinnai RX199iN Tankless Water Heater Indoor/Outdoor
Anyone looking for a water heater that combines powerful performance with flexible installation options will appreciate the Rinnai RX199iN Tankless Water Heater. It runs on natural gas or propane, using a Smart Sense gas control system to save fuel efficiently. This model can be installed indoors or outdoors with the Versa Vent system, though outdoor setups need a special vent cap. It delivers up to 11.1 gallons per minute, enough to supply seven fixtures at once, all from a compact unit about the size of a small suitcase. The interface is easy to use, with options for remote control and simple maintenance.
- Power Source:Gas (Natural gas or propane)
- Installation Type:Indoor/outdoor with venting system
- Maximum Flow Rate:11.1 GPM
- Temperature Range / Max Temperature:Up to 140°F
- Energy Efficiency / Technology:UEF 0.98, Smart Sense gas control
- Control / Display Type:Easy interface, app support (optional WiFi)
- Additional Feature:Versa Vent system compatible
- Additional Feature:Smart Sense gas control
- Additional Feature:Optional WiFi remote control
EcoSmart ECO 11 Electric Tankless Water Heater
For those seeking endless hot water without wasting energy, the EcoSmart ECO 11 Electric Tankless Water Heater stands out as an ideal solution. This compact, wall-mounted unit uses patented self-modulating technology to heat water on demand, providing a consistent temperature within one degree. Its 13KW power efficiently supplies hot water for a single shower and sink, especially in climates where incoming water is 67°F or higher. The digital control lets users set temperatures from 80 to 140°F with ease. Thanks to its small size and 99% energy efficiency, it saves space and cuts energy costs while providing reliable performance.
- Power Source:Electric (240V)
- Installation Type:Wall-mounted
- Maximum Flow Rate:3.1 GPM
- Temperature Range / Max Temperature:80-140°F
- Energy Efficiency / Technology:99% thermal efficiency, patented self-modulating
- Control / Display Type:Digital temperature control with LED display
- Additional Feature:Patented self-modulating tech
- Additional Feature:Certified WaterSense labeled
- Additional Feature:Lifetime warranty on components
Rinnai RXP199iN Tankless Water Heater with Pump
Households with high hot water demand will find the Rinnai RXP199iN Tankless Water Heater with Pump a smart choice. This compact unit, roughly the size of a small suitcase, fits easily on a wall and saves precious space. It delivers a powerful flow of up to 11.1 gallons per minute, enough for seven fixtures at once. It runs on natural gas or propane, featuring a Smart Sense gas control system that guarantees efficiency and safety. The built-in Smart-Circ pump learns your water use, cutting wait times and energy waste. With optional Wi-Fi control, it blends convenience with strong performance perfectly.
- Power Source:Gas (Natural gas or propane)
- Installation Type:Wall-mounted
- Maximum Flow Rate:11.1 GPM
- Temperature Range / Max Temperature:Up to 140°F
- Energy Efficiency / Technology:UEF 0.98, Energy Star qualified, Smart-Circ pump
- Control / Display Type:Easy interface, app support, WiFi option
- Additional Feature:Smart-Circ recirculation pump
- Additional Feature:Energy Star qualified
- Additional Feature:Quick Flush maintenance feature
Tankless Electric Water Heater 110V 3000W
A tankless electric water heater running on 110V and providing 3000W power is a smart choice for those who need instant hot water without the bulk of traditional tanks. Crafted from durable ABS material, it offers a sleek, compact design perfect for tight spaces like under sinks. The heater quickly raises water temperature up to 131°F, depending on flow rate, making it ideal for kitchens and small bathrooms. Its LED display lets users switch between Fahrenheit and Celsius easily. Safety features like waterproofing, leakage protection, and automatic shutoff add peace of mind, while simple installation with standard piping fits most setups smoothly.
- Power Source:Electric (110V)
- Installation Type:Under sink (vertical only)
- Maximum Flow Rate:0.5 GPM (not suitable for showers)
- Temperature Range / Max Temperature:Up to 131°F
- Energy Efficiency / Technology:98% thermal efficiency
- Control / Display Type:LED digital display, temperature unit switchable
- Additional Feature:IPX4 waterproof rating
- Additional Feature:Multiple safety protections
- Additional Feature:Vertical installation required
Portable 1800W Immersion Water Heater with Display
Anyone needing quick and reliable hot water on the go will appreciate the Portable 1800W Immersion Water Heater with Display. This compact device heats water fast using 1800 watts and plugs into any standard 120V outlet. It works well in buckets, bathtubs, small pools, or even stock tanks, making it versatile for home or farm use. The smart thermostat lets users set temperatures up to 175°F, and the digital display shows real-time water temperature. Safety is key, with features like auto-shutoff and dry-burn prevention. Its submersible design and durable cord guarantee easy, worry-free heating anywhere.
- Power Source:Electric (120V)
- Installation Type:Portable immersion (submersible)
- Maximum Flow Rate:Not specified (immersion heater)
- Temperature Range / Max Temperature:Up to 175°F (adjustable)
- Energy Efficiency / Technology:Smart thermostat control with auto shutoff
- Control / Display Type:Digital temperature display on controller
- Additional Feature:Adjustable thermostat control
- Additional Feature:Real-time digital temperature
- Additional Feature:Submersible auto-shutoff design
Immersion Electric Water Heater 2000W with LCD
For those who often find themselves needing hot water quickly while on the go, the Immersion Electric Water Heater 2000W with LCD offers a practical and efficient solution. This powerful device heats up to 5 gallons of water in minutes, making it perfect for camping, travel, or winter chores. Its rust-proof stainless steel cover protects you from burns, while the LCD thermometer shows water temperature in seconds. Just make certain the heater is fully submerged before use, and only heat water in non-metal containers like basins or buckets. Safety is key, so avoid touching water during operation and unplug before removing the heater.
- Power Source:Electric (110-125V)
- Installation Type:Immersion (submersible)
- Maximum Flow Rate:Not specified (immersion heater)
- Temperature Range / Max Temperature:Not specified exact max, heats rapidly
- Energy Efficiency / Technology:Fast heating, energy saving by short use
- Control / Display Type:LCD digital thermometer display
- Additional Feature:Rust-proof 304 stainless cover
- Additional Feature:LCD digital thermometer
- Additional Feature:Includes scale cleaning ball
110V Tankless Electric Water Heater 3000W Compact
Compact yet powerful, the 110V Tankless Electric Water Heater 3000W Compact fits perfectly under the sink, making it ideal for small spaces or quick hot water needs. Its small size does not limit its strength, providing consistent hot water without taking up much room. Users can easily switch between Fahrenheit and Celsius, which adds a handy touch for temperature control. Installing it is straightforward, requiring a circuit breaker of at least 32AMP and proper wiring. This tankless design heats water instantly, saving energy and lowering bills. It’s a smart, space-saving choice that keeps comfort close at hand.
- Power Source:Electric (110V)
- Installation Type:Under sink wall-mounted
- Maximum Flow Rate:Not specified (compact under sink)
- Temperature Range / Max Temperature:Not specified exact max, adjustable
- Energy Efficiency / Technology:Energy efficient electric tankless
- Control / Display Type:Digital display, temperature scale convertible
- Additional Feature:Convertible temperature scale
- Additional Feature:Compact footprint design
- Additional Feature:Requires circuit breaker ≥32A
GE 10 Gallon Plug and Play Electric Water Heater
The GE 10 Gallon Plug and Play Electric Water Heater shines as an excellent choice for anyone needing a quick and easy hot water solution. It installs in minutes, connecting effortlessly to existing plumbing with standard 3/4-inch NPT fittings and any 120-Volt supply. Its compact design fits neatly into kitchens, bathrooms, laundry rooms, and even RVs or garages, saving precious space. This heater works alone or alongside another unit to enhance hot water, perfect for washing machines or long plumbing runs. Users can adjust the thermostat easily to reach the perfect temperature. With an 8-year warranty on the tank and parts, plus a 1-year labor warranty, it offers reliable peace of mind.
- Power Source:Electric (120V)
- Installation Type:Tank (plug and play)
- Maximum Flow Rate:Not specified (10 gallon tank)
- Temperature Range / Max Temperature:Adjustable thermostat (exact range not specified)
- Energy Efficiency / Technology:Hot water booster, energy efficient for short use
- Control / Display Type:Adjustable thermostat (no digital display specified)
- Additional Feature:Hot water booster option
- Additional Feature:8-year tank warranty
- Additional Feature:Compatible with 3/4-inch NPT
Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater
Anyone looking to install a reliable water heater in tight spaces will appreciate the Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater. This compact unit fits neatly in small areas, saving up to 98% more space compared to traditional models. It requires a 120-volt hardwired connection and a 30 AMP double pole breaker. The thermostatic control lets users adjust water temperature in one-degree steps between 80°F and 140°F, ensuring warm water at any time needed. Designed for upright mounting with bottom connections, it operates without venting. It’s ideal for bathrooms, offices, or garages where space and consistent hot water matter most.
- Power Source:Electric (120V)
- Installation Type:Wall-mounted (upright)
- Maximum Flow Rate:Not specified (point-of-use low flow)
- Temperature Range / Max Temperature:80-140°F
- Energy Efficiency / Technology:Thermostatic control, efficient on-demand heating
- Control / Display Type:Thermostatic control adjustable in 1-degree increments
- Additional Feature:Bottom water connections
- Additional Feature:Upright mounting design
- Additional Feature:1-degree adjustable thermostat
Factors to Consider When Choosing Water Heaters
Whenever picking a water heater, you’ll want to consider how much hot water you need and how fast it flows. Don’t forget to check the energy efficiency ratings to keep your bills low and the environment happy. Also, consider where you’ll install it and how easy it is to control the temperature to fit your daily routine.
Energy Efficiency Ratings
Although you might focus on size and cost initially, energy efficiency ratings play a crucial role in choosing the right water heater for your home. These ratings show how well a unit turns energy into hot water, often displayed as a percentage or Uniform Energy Factor (UEF). Tankless water heaters shine here whenever you need it, cutting down wasted energy from standby heat losses. Electric models can reach nearly 99% efficiency, while gas ones vary between 90% and 98%, depending on their design. Some use self-modulating technology to match power output with your demand, slashing energy use up to half. Look for certification labels that confirm high efficiency, helping you save on bills and reduce your environmental footprint with every shower.
Flow Rate Capacity
How do you know whether a water heater can keep up with your household’s hot water needs? It all comes down to flow rate capacity, measured in gallons per minute (GPM). This tells you how much hot water the heater can deliver continuously. In case you have multiple showers, sinks, or appliances running at once, you’ll want a higher flow rate—around 10 GPM or more.
On the other hand, provided you mostly use one fixture at a time, a lower rate works just fine. Keep in mind, colder inlet water means your heater could struggle to maintain the flow rate you expect. Especially with tankless models, matching the flow rate to your peak usage prevents those frustrating cold showers during demand spikes. Keep this in mind to guarantee steady, reliable hot water every time.
Installation Requirements
Grasping how much hot water your household needs is just the beginning. Next, you’ll want to evaluate the installation details to avoid surprises. Your water heater could need specific electrical wiring, like 240V or 120V, with the right circuit breakers to keep things safe and efficient.
Consider where you’ll mount it too—size and weight matter because the wall or floor must support it well. Plumbing connections need proper fittings to prevent leaks, so don’t skip on quality parts. Venting is another factor; electric tankless models usually don’t need venting, but gas ones require special vents depending on indoor or outdoor setups. Since these tasks can get tricky, hiring a professional helps you follow safety codes and guarantees your new heater works perfectly from day one.
Temperature Control Options
What kind of temperature control do you want for your water heater? You’ll find many options that help you get just the right heat every time. Some models come with digital thermostats that let you adjust the temperature in tiny steps—sometimes as precise as one degree.
These controls keep your water steady, so no sudden cold shocks during your shower. Tankless heaters often feature easy-to-read LED displays, making it simple to set and check the temperature. Others include smart controls that adjust power based on how much hot water you use, saving energy while keeping things comfy. Temperatures usually range from about 80°F to 140°F, giving you flexibility for everything from gentle warm water to a steamy blast. Choosing the right control means every shower feels just right.
Size and Space Needs
Where you plan to install your water heater plays a big role in choosing the right size and style. In case space is tight, tankless models are a great fit since they save up to 90% of installation room compared to traditional tanks. You can mount them on a wall, freeing up floor space. Point-of-use heaters are even smaller, perfect for under sinks or cramped utility spots.
But suppose you need a whole-home system with a large flow rate, expect it to take up more room due to its bigger heating elements. It’s also crucial to size your heater properly—not just to fit the area but to match your hot water demand and incoming water temperature. Oversizing wastes space and raises costs, so getting the right fit keeps things efficient and comfy.
Fuel Type Compatibility
How do you know which fuel type suits your home best upon picking a water heater? Initially, consider what’s already available. In case your home is hooked up to natural gas or propane, a gas-fired water heater could be the easiest choice, but you’ll need proper venting and safe gas line setup. On the other hand, if you rely on electricity, check whether your wiring supports 120V or 240V—this guarantees your heater runs smoothly and safely. Some modern heaters smartly adjust fuel use to save energy, whether electric or gas. Keep in mind, fuel compatibility affects your energy bills, installation effort, and even your carbon footprint. So, choosing the right fuel type isn’t just about what works now—it’s about what fits your home and lifestyle best in the long run.
Maintenance and Durability
Choosing the right fuel type sets the stage, but keeping your water heater running well over time depends on how you care for it and the quality of its build. You’ll want to flush tankless models regularly to clear mineral buildup that can slow heating and wear out parts.
Durable materials like copper heating elements and stainless steel casings resist corrosion, so your heater lasts longer without costly repairs. Some heaters come with self-modulating technology, which adjusts power to match your hot water needs, reducing stress on components and cutting down maintenance. Look for features like dry-boil protection and waterproof ratings to guard against damage. Plus, water heaters with parts you can access and fix yourself save time and money, keeping your hot showers hassle-free for years.
