Tired of waiting for hot water or running out mid-shower? A 120 volt tankless water heater for shower applications might be just what you need! These compact, energy-efficient units provide instant hot water on demand, saving space and reducing your energy bills. While 120V models are typically designed for point-of-use or low-flow situations, advancements in technology mean some can certainly handle a single shower, especially in warmer climates or for RVs and small cabins. We’ve scoured the market to bring you a comprehensive list of the best options available, ensuring you can enjoy endless, comfortable showers without the hassle of a traditional bulky tank.
Quick Product Comparison
Our Top 10 Best 120 Volt Tankless Water Heater For Shower Reviews – Expert Tested & Recommended
1. Stiebel Eltron Tempra 36 Plus Electric Tankless Water Heater
The Stiebel Eltron Tempra 36 Plus is renowned for its exceptional quality and performance in providing on-demand hot water. While primarily a whole-house unit, its advanced flow control system ensures continuous hot water, which can be highly beneficial for consistent shower temperatures even in varying demand scenarios.
Key Features That Stand Out
- ✓ Exclusive Advanced Flow Control for consistent water temperature
- ✓ Energy-saving auto-modulation technology
- ✓ Compact, modern white design for easy integration
- ✓ Exceptional durability and reliability for long-term use
Why We Recommend It
We recommend the Stiebel Eltron Tempra 36 Plus for its superior performance and energy efficiency. Although a higher-powered unit, its technology ensures you never run out of hot water, making it a dream for long, comfortable showers. It’s a smart investment for consistent, reliable hot water in your home.
Best For
This heater is ideal for homeowners seeking a premium, high-performance tankless solution that guarantees endless hot water for multiple uses, including powerful showers, without compromise.
Pros and Cons
Pros:
- Provides continuous, endless hot water
- Advanced flow control ensures stable temperatures
- Energy-efficient operation reduces utility costs
- Compact design saves valuable space
Cons:
- Requires significant electrical infrastructure
- Higher initial cost compared to smaller units
Customer Reviews
Customer Review: “For five years I’ve lived in this home with a 75 gallon gas hot water heater. It was in the house when I moved in and to be honest I’ve never had any complaints. Though it worked fine I decided to change out and because we are going solar roof next year I wanted to go electric.”
Customer Review: “Purchases 2022Works well and gets smoking hotI only have it hooked up to 3 sinks, a washer and a dishwasher but I’ve never had an issue with hot water, I also haven’t ran all those at once. I give it 5 stars cause it does the job. You will have to run 8 gauge wire to it if you get the Tempra 20 make”
2. Rheem 3.5kW 120V Point-of-Use Thermostatic Electric Tankless Water Heater
The Rheem 3.5kW 120V tankless water heater is a fantastic option for point-of-use applications, offering reliable hot water for smaller needs like a single shower or a bathroom sink. Its thermostatic controls allow for precise temperature adjustments, ensuring a comfortable experience every time.
Key Features That Stand Out
- ✓ Hardwired to 120 volts, requiring a 30-amp breaker
- ✓ Compact size saves space, ideal for tight installations
- ✓ Thermostatic temperature controls from 80 to 140 degrees Fahrenheit
- ✓ On-demand, consistent hot water delivery
Why We Recommend It
We highly recommend this Rheem unit as an excellent 120 volt tankless water heater for shower use in specific scenarios, especially when space is limited and consistent, low-flow hot water is needed. Its precise temperature control makes it easy to dial in your perfect shower warmth.
Best For
This is best for single-person showers in small apartments, RVs, cabins, or a dedicated shower in an office breakroom or garage where a 120V connection is readily available.
Pros and Cons
Pros:
- Provides instant, consistent hot water for point-of-use
- Extremely compact design, perfect for small spaces
- Easy and precise temperature adjustment
- Energy-efficient for low-flow applications
Cons:
- Not suitable for high-demand or multiple concurrent uses
- Requires a dedicated 30-amp circuit
Customer Reviews
Customer Review: “Love this tankless heater, it works great! Never run out of hot water while showering! There’s only 2 of us in our home so not sure how it would work with a family but I’m sure a bigger size or maybe another mounted where hot water is needed most??Would definitely buy again!!”
Customer Review: “There are many factors to consider before buying an electric tankless heater. By far the most important — at least for me — is whether the ground water temperature in your area is consistently warm enough to give the water heater a chance to succeed. I live in North Central Florida where the groun”
3. Tankless Water Heater Flushing Kit
While not a water heater itself, this tankless water heater flushing kit is an absolute must-have for anyone owning a tankless unit, including 120 volt tankless water heaters for showers. Regular flushing helps maintain performance, prolongs the lifespan of your heater, and ensures you continue to get efficient hot water.
Key Features That Stand Out
- ✓ Complete kit for maintaining your tankless water heating system
- ✓ Includes a powerful 1/6HP submersible sump pump
- ✓ Comes with a 3-gallon bucket and a convenient lid opener
- ✓ Two 6-foot PVC hoses with washers for easy connection
Why We Recommend It
We highly recommend this flushing kit because proper maintenance is crucial for the longevity and efficiency of any tankless water heater. Flushing helps remove mineral buildup, especially important if you live in an area with hard water. This kit makes the maintenance process straightforward and accessible for any homeowner, helping your 120 volt tankless water heater for shower perform its best. You might also consider a water softener for tankless water heaters to further reduce mineral buildup.
Best For
Every owner of a tankless water heater, particularly those in areas with hard water, to ensure their unit operates efficiently and lasts longer.
Pros and Cons
Pros:
- All-inclusive kit, no need for separate purchases
- Powerful pump for efficient flushing
- Easy to use, even for DIY beginners
- Extends the lifespan and efficiency of your heater
Cons:
- Does not include descaling solution (usually vinegar is sufficient)
- Requires a dedicated space for the flushing process
Customer Reviews
Customer Review: “This kit comes with everything you need to flush your tankless water heater—bucket, pump, hoses, and even a handy lid opener. Installation was simple, and the included pump worked quietly and efficiently. I paired it with a descaling solution (you can also use vinegar) and had the whole process done”
Customer Review: “This kit has everything you need to flush a tankless water heater without making multiple trips to the hardware store. The pump is plenty powerful, the hoses fit perfectly, and the bucket size is just right for the job.I especially liked that it came with adapters, washers, and even a bucket lid ope”
4. GRS Electric 13KW 240V Tankless Water Heater
The GRS Electric Tankless Water Heater is designed to provide endless hot water, perfect for homes looking to upgrade their heating system. While this particular model is 240V, it showcases the efficiency and convenience found in many electric tankless heaters, including the principles behind a powerful 120 volt tankless water heater for shower use.
Key Features That Stand Out
- ✓ Provides endless hot water for multiple applications
- ✓ Energy-efficient system lowers utility costs
- ✓ Space-saving wall-mounted design
- ✓ Digital display for easy temperature control and monitoring
Why We Recommend It
We recommend this GRS unit as an example of a robust electric tankless system that prioritizes efficiency and space-saving. It’s a great choice for those seeking to minimize energy waste and enjoy continuous hot water for showers and other household needs, embodying the benefits of modern tankless technology.
Best For
Households or properties seeking a powerful, energy-efficient instant hot water solution for whole-house use, including multiple showers, where electrical requirements can be met.
Pros and Cons
Pros:
- Delivers unlimited hot water instantly
- Significant energy savings compared to traditional tanks
- Sleek, compact design saves valuable floor space
- Digital display for precise temperature management
Cons:
- Requires substantial electrical capacity for installation
- Higher initial cost than some smaller point-of-use models
Customer Reviews
Customer Review: “Title: Easy-to-Install, Efficient Tankless Water Heater ReviewUpgrading to this tankless water heater has been a game-changer. Installation was a breeze, and now hot water comes quickly, making showers, laundry, and dishes hassle-free. Controlling the temperature is a breeze with the modern touchscr”
Customer Review: “I’m delighted with my water heater purchase. The fast and constant hot water has made showers more enjoyable. The easy installation was a plus, and it came at a great price point. The packaging was also well done, ensuring a smooth delivery. Highly recommended!”
5. Rheem RTGH-95DVLN-3 Indoor Natural Gas Tankless Water Heater
The Rheem RTGH-95DVLN-3 is a high-capacity indoor natural gas tankless water heater that delivers exceptional performance. While this article focuses on 120 volt tankless water heaters for showers, it’s important to acknowledge that natural gas units offer very high flow rates and consistent temperature, providing an alternative for those with gas hookups. This unit exemplifies top-tier tankless hot water delivery.
Key Features That Stand Out
- ✓ Impressive flow rate of 0.4 to 9.5 GPM for multiple hot water needs
- ✓ Adjustable temperature settings from 100 to 140°F (120°F default)
- ✓ Equipped with electric ignition for reliable start-up
- ✓ Stainless steel components for enhanced durability
Why We Recommend It
For homes with natural gas access, this Rheem tankless water heater is an outstanding choice for powerful and continuous hot water, easily handling multiple showers simultaneously. It represents the pinnacle of on-demand hot water technology, offering superior flow rates compared to typical 120V electric models.
Best For
Large families or homes requiring very high hot water demand, with access to natural gas, seeking a whole-house solution for endless hot showers and other concurrent hot water uses.
Pros and Cons
Pros:
- Superior flow rate handles multiple hot water demands
- Very energy-efficient for long-term savings
- Consistent hot water temperature without fluctuations
- Durable stainless steel construction
Cons:
- Requires natural gas line and professional installation
- Higher upfront cost than many electric units
- Ventilation requirements add to installation complexity
Customer Reviews
Customer Review: “Installation as long as it is done following the manual. Quiet, efficient and easy to setup.To have good water pressure, use an expansion tank with a pressure regulator, this way it keeps the line with adequate and constant pressure and does not damage the machine.well built and compact compared to “
Customer Review: “The media could not be loaded.Definitely want to install the Rheem reculation pump when installing this unit.Installation is somewhat complicated, not something I would do as a 1 day project. I have as a amateur about 15 hours total time from unboxing to flushing system..but well worth the time.Once”
6. Mini Under Sink Electric Tankless Water Heater
This mini under-sink 120 volt tankless water heater is designed for convenience and efficiency, providing instant hot water exactly where you need it. While the manufacturer notes it’s primarily for low-flow use, with proper water temperature management and a low-flow showerhead, it could serve as a functional 120 volt tankless water heater for shower in specific situations, like a small cabin or utility shower.
Key Features That Stand Out
- ✓ 3kW 120V power for point-of-use heating
- ✓ Enlarged LED digital display with easy knob control
- ✓ Thermostatic for instant on-demand hot water
- ✓ Multi-protective intelligent design for safe operation
Why We Recommend It
We recommend this mini tankless heater for its compact size, ease of use, and quick hot water delivery for single applications. Its 120V compatibility makes it a versatile choice for supplemental heating or for specific shower setups where electrical power is limited, offering good value for its features.
Best For
Small, isolated sinks, utility rooms, RVs, or for highly specialized low-flow shower applications where only 120V power is available and hot water demand is minimal.
Pros and Cons
Pros:
- Extremely compact, perfect for under-sink installation
- Easy digital display and knob control
- Provides hot water almost instantly
- Multiple safety features for peace of mind
Cons:
- Limited flow rate, not ideal for standard showers
- May struggle with very cold inlet water temperatures
Customer Reviews
Customer Review: “Excellent choice for warm water at a sink. The 3000 model is a convenient plug-in installation. Easy installation once you do the gymnastics of clearing out and accessing the cabinet under your sink. You’ll need to purchase a connector between the device and the hot water faucet but this is avail”
Customer Review: “It works great! The thermostat doesn’t show the setting, only the actual temperature. But after a few adjustments, no problem. I love having instant hot water.”
7. Electric Tankless Water Heater 110V 3000W
This electric 110V 3000W tankless water heater offers instant hot water for small-scale applications. Its compact and efficient design makes it a viable option for a dedicated 120 volt tankless water heater for shower in a recreational vehicle, tiny home, or a low-flow secondary bathroom where a standard outlet is available.
Key Features That Stand Out
- ✓ Made of high-quality ABS material with LED display
- ✓ Ultra-thin and smooth appearance for compact installation
- ✓ Multiple protection functions including water and electricity isolation
- ✓ IPX4 waterproof rating for safety
Why We Recommend It
We recommend this unit for its blend of compact design, essential safety features, and ability to provide on-demand hot water. It’s particularly suitable for situations where maximizing space and having quick access to warm water are priorities, making it a good fit for specific 120V shower needs.
Best For
Point-of-use applications like a single sink, or a very low-flow shower in an RV, boat, or small cabin where only 110V/120V power is readily available.
Pros and Cons
Pros:
- Very small footprint, easy to conceal
- Instantaneous hot water for immediate use
- Robust safety features including IPX4 waterproofing
- Simple LED display for basic operation
Cons:
- Limited heating capacity for full-sized showers
- May require a dedicated 30-amp circuit despite 110V rating
Customer Reviews
Customer Review: “As our tankless water heater crapped out just before new years, all these holidays prevented a repair… This unit did a really good job keeping us clean… I routed the hose from the shower head to the in-side, and bought another handheld shower head $19 Home Depot just to get a hose for the out-si”
Customer Review: “Folks, this is dangerous! The gauge of wire that is on this device will get hot! This little device pulls 32 amps but the gauge of wire that is on the cord isn’t rated for that. We had an electrician run our wiring and install a breaker for it. Once we started using it, the breaker would pop, th”
8. Mini Electric Tankless Water Heater 110V 3KW
This sleek, snow-white mini electric 110V 3KW tankless water heater offers instant hot water with automatic temperature control. It’s an ideal compact solution for single point-of-use applications, and with careful flow management, it can serve as a functional 120 volt tankless water heater for shower in scenarios with lower hot water demands.
Key Features That Stand Out
- ✓ Digital display and rotating buttons for adjustable temperature control
- ✓ Inner liner made of 1.5mm thick enamel coated steel for insulation
- ✓ Energy-saving automatic temperature control
- ✓ Shuts off when water temperature reaches 167°F for safety
Why We Recommend It
We like this mini heater for its user-friendly design and intelligent temperature management. Its ability to provide instant hot water, coupled with energy-saving features, makes it a convenient and practical choice for small hot water needs, including specific 120V shower setups. It also features a robust inner liner for durability.
Best For
Small sinks, campers, utility rooms, or a dedicated low-flow shower in a guest bathroom or workshop where only 110V/120V power is readily available.
Pros and Cons
Pros:
- User-friendly digital display and controls
- Good insulation with enamel-coated steel liner
- Automatic temperature control saves energy
- Compact and aesthetically pleasing design
Cons:
- Limited capacity for multiple or high-flow uses
- Performance may drop in very cold climates
Customer Reviews
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Customer Review: “I needed a small water heater for my outdoor shower in the summer. This little heater does the trick! Hot water for a quick rinse off after yard work is great. Simple hookup and it takes up minimal space.”
9. Electric Tankless Water Heater 6000W 110V
This 6000W 110V electric tankless water heater stands out for its robust heating system, designed to eliminate long waits for hot water. Its advanced technology, digital display, and self-modulating features make it a strong contender for a dedicated 120 volt tankless water heater for shower, offering more power than typical mini units.
Key Features That Stand Out
- ✓ 6000W heating system for accelerated hot water delivery
- ✓ Advanced self-modulating technology for efficiency
- ✓ Digital display integrated into a sleek glass panel
- ✓ Multiple safety protections built-in
Why We Recommend It
With its 6000W output on a 110V/120V circuit, this tankless heater provides a significant boost in hot water delivery, making it highly effective for single showers, especially in warmer climates. The advanced features and safety mechanisms ensure a reliable and convenient user experience.
Best For
Single showers or sinks requiring more consistent hot water than a basic mini-unit can provide, particularly in smaller homes, workshops, or vacation properties with 110V/120V electrical systems.
Pros and Cons
Pros:
- Higher wattage for better hot water performance on 110V
- Instant and continuous hot water flow
- Sleek design with easy-to-read digital display
- Self-modulating technology saves energy
Cons:
- Requires a dedicated 50-amp circuit, which might need electrical upgrade
- May still struggle with very cold incoming water for long showers
Customer Reviews
Customer Review: “Using this for our shower at our hunting camp. This thing works flawless and gives non stop hot water for shower after shower after shower. I actually had everyone at camp take showers back to back and this thing never faltered. Easy to use and install, 10/10 would recommend.”
Customer Review: “Worked great gets hot almost instantly I would definitely recommend this to someone else”
10. Mini Electric Tankless Water Heater 110V 3000W
The DOYXC Mini 110V 3000W tankless water heater offers instant hot water and a super compact design, making it another excellent choice for a point-of-use solution. Its safety features and simple operation make it a practical option for very specific low-flow 120 volt tankless water heater for shower needs.
Key Features That Stand Out
- ✓ Instant hot water delivery, eliminating waiting times
- ✓ Compact and portable design, suitable for small spaces
- ✓ Multiple protection features including IPX4 waterproof rating
- ✓ Leakage protection and dry burning protection for safety
Why We Recommend It
This mini electric tankless heater is a solid recommendation for its robust safety features and ability to provide immediate hot water in a small footprint. It’s especially useful for applications where a small, efficient hot water source is critical and space is at a premium.
Best For
Small applications like a single handwashing sink, an RV bathroom, or a very light-use shower where space and 110V/120V power are the primary considerations.
Pros and Cons
Pros:
- Provides hot water on demand with no preheating
- Extremely compact, fits into tight spaces
- Comprehensive safety features built-in
- Easy to install and operate
Cons:
- Limited hot water output for continuous shower use
- Performance can vary significantly with cold inlet temperatures
Customer Reviews
Customer Review: “Not impressed. Takes water from 54 degrees to 70 running water slow or fast. Bought for a sink in the shop to wash hands. Cord gets warm to the touch after a few minutes Had to install a 30 amp breaker to run it.”
Customer Review: “The compact design of this tankless hot water heater makes it perfect for smaller spaces!Installing this tankless hotwater heater is a relatively straightforward process. It is easy to install, and no special wiring or plumbing skills are needed. It easily mounts on the wall or under the cabinet if “
Complete Buying Guide for Best 120 Volt Tankless Water Heater For Shower
Choosing the best 120 volt tankless water heater for your shower can feel a bit overwhelming, but with the right information, you’ll be enjoying endless hot water in no time. Here’s what we consider essential when making a selection.
Essential Factors We Consider
First and foremost, understand that 120V tankless water heaters are generally designed for point-of-use, meaning they heat water for a single fixture or a very low-flow shower. Their performance largely depends on the inlet water temperature and the desired output temperature.
- ✓ Flow Rate (GPM): This is crucial. For a comfortable shower, you typically need at least 1.5-2.0 GPM. A 120V unit will likely only achieve this if your incoming water is already quite warm, or if you use a low-flow showerhead. Check the temperature rise chart provided by the manufacturer.
- ✓ Power (Wattage): Most 120V units range from 1.5kW to 6kW. Higher wattage means a greater capacity for heating water, but also higher electrical demand. Ensure your electrical panel can support the required amperage (e.g., a 6000W unit on 120V would draw 50 amps).
- ✓ Inlet Water Temperature: This is arguably the most important factor for 120V tankless heaters. If your groundwater is very cold (e.g., 40°F in winter), a 120V unit will struggle to heat enough water for a shower to a comfortable temperature (e.g., 105°F). They perform best where inlet temperatures are already above 60-70°F.
- ✓ Size and Installation: These heaters are usually compact and can be installed under a sink or in a small closet. Ensure you have the necessary electrical and plumbing connections. Some might require professional installation to meet local codes.
- ✓ Safety Features: Look for units with overheating protection, leakage detection, and an IPX4 waterproof rating, especially if installing in areas prone to moisture.
- ✓ Brand Reputation & Warranty: Opt for reputable brands known for quality and customer support. A good warranty provides peace of mind.
Budget Planning
When budgeting for a 120 volt tankless water heater for shower, consider not just the upfront cost of the unit, but also potential installation expenses. While the heaters themselves are often affordable, you might need to hire an electrician to install a dedicated circuit if your existing wiring isn’t sufficient for the unit’s wattage. Remember, the long-term energy savings can offset the initial investment, as these heaters only use power when you need hot water. Also, consider the cost of maintenance; a flushing kit is a smart investment to keep your unit running efficiently. If you live in an area with hard water, you might also want to look into a water filter for limescale to protect your heater.
Final Thoughts
A 120 volt tankless water heater for shower use is a brilliant solution for specific needs, such as single, low-flow showers in small spaces, RVs, or cabins. They offer significant energy savings and convenience over traditional tank heaters. Always prioritize matching the heater’s capacity to your actual hot water demand and consider your local inlet water temperature. With careful selection, you can enjoy endless, comfortable showers without wasting energy or space.
Frequently Asked Questions
Q: Can a 120V tankless water heater really handle a shower?
A: Yes, but with limitations. 120V tankless heaters are best for low-flow showers (typically 1.0-1.5 GPM showerheads) and perform optimally when the incoming water temperature is already moderate to warm (above 60-70°F). In colder climates, they might only provide lukewarm water for a standard shower, or require a very restricted flow.
Q: What’s the main difference between 120V and 240V tankless water heaters?
A: The primary difference is heating power and capacity. 240V units have significantly more power (wattage) and can heat more water faster, supporting multiple fixtures or standard to high-flow showers even with very cold inlet water. 120V units are less powerful, suitable for single point-of-use applications with lower flow requirements.
Q: Do 120V tankless water heaters save energy?
A: Absolutely! They are highly energy-efficient because they only activate and heat water on demand, eliminating standby heat loss associated with traditional tank heaters. You only use energy when you actually need hot water.
Q: Is professional installation required for a 120V tankless water heater?
A: While some smaller 120V units might plug into a standard outlet, many higher-wattage 120V models (e.g., 3kW or 6kW) require a dedicated circuit and a specific amperage breaker. For safety and compliance with electrical codes, it’s often best to have a qualified electrician install the unit, especially for hardwired models.
Q: How long do 120V tankless water heaters last?
A: With proper installation and regular maintenance, a quality electric tankless water heater can last 10-20 years, significantly longer than traditional tank heaters (which typically last 8-12 years). Regular flushing to remove mineral buildup is key to extending its lifespan.
Choosing the best 120 volt tankless water heater for your shower means finding the perfect balance between your hot water needs, electrical capabilities, and budget. Our comprehensive guide and top product recommendations are here to help you make an informed decision. Say goodbye to cold showers and hello to endless, on-demand warmth. Ready to transform your shower experience? Click through to compare prices and find the ideal tankless water heater for your home on Amazon today!
