Need hot water in a spot where you can’t run 220V power? 110 volt (sometimes called 120V) tankless water heaters are a game-changer for apartments, under-sink installs, wet bars, garages, tiny homes, and anywhere you want quick, endless hot water without a bulky tank. These compact units are easy to install, plug into a standard outlet, and are perfect for low-flow fixtures or single-room solutions. Here’s your complete guide to the best 110 volt tankless water heaters, how to choose, what to expect, and the top models for 2025.
Quick Picks: Top 110 Volt Tankless Water Heaters
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Best Overall:
EcoSmart POU 3.5 Point-of-Use Tankless Water Heater – Compact, efficient, and ideal for sinks, bars, and RVs. -
Best for Instant Hot Water:
Thermoflow UT10 110V Electric Tankless Water Heater – Digital controls, fast heating, and ultra-easy installation. -
Best Budget:
Marey GA5PORT Portable Tankless Water Heater – Versatile, affordable, and great for camping or outdoor sinks.
Buyer’s Guide: How to Choose a 110 Volt Tankless Water Heater
- Intended Use: 110V units are best for point-of-use applications (single sink, handwashing, wet bar, small RV). They can’t supply a whole house or handle high-flow showers.
- Flow Rate (GPM): Most deliver 0.5–1.5 gallons per minute—enough for sinks or low-flow applications. Not suitable for standard showers.
- Power Requirements: Plug into a standard 110/120V outlet. Always check the amperage (most require 15–20 amps). Avoid extension cords for safety.
- Temperature Rise: The colder your incoming water, the less hot water output you’ll get. In northern climates, expect lower flow at higher temps.
- Installation Location: Under-sink, wall-mount, or portable/outdoor. Make sure there’s access to water and power.
- Controls & Safety: Look for digital controls, thermal protection, and safety certifications.
- Warranty: Choose a model with at least a 1-year warranty and solid customer support.
What Can a 110V Tankless Water Heater Run?
- Single bathroom or kitchen sink (hand washing, dish rinsing)
- Wet bar or laundry utility sink
- RV or camper van sink
- Cabins, workshops, garages, outdoor showers (with low flow)
- Not designed for standard residential showers or bathtubs
Detailed Reviews: Best 110 Volt Tankless Water Heaters
EcoSmart POU 3.5 Point-of-Use Tankless Water Heater
- 3.5 kW, 120V; compact, fits under any sink
- Delivers up to 0.5–1.0 GPM—perfect for handwashing and utility sinks
- Easy installation—mount on wall, plug in, connect water lines
- Self-modulating technology saves energy and keeps water at your set temperature
- 1-year warranty and strong support from EcoSmart
Pros:
- Top seller for small applications
- Reliable, efficient, and simple to install
- Works with most faucets and fixtures
Cons:
- Not enough power for a standard shower
- Flow and temperature drop in cold climates
Final Verdict: The best 110V tankless heater for sinks, bars, or RVs.
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Thermoflow UT10 110V Electric Tankless Water Heater
- 2.0 kW, 110V; delivers instant hot water at up to 0.6 GPM
- Digital thermostat with LED display for precise temp control
- Thermal cut-off protection and dry heating safeguard
- Super easy installation—comes with mounting bracket
- Perfect for under-sink, bar, or office breakroom
Pros:
- Precise digital controls
- Energy-saving and compact
- Great for retrofit or rental units
Cons:
- Limited to one low-flow fixture
- Needs short pipe run for best performance
Final Verdict: The best choice for easy, instant hot water at a sink.
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Marey GA5PORT Portable Tankless Water Heater
- Propane-powered, but uses 110V for ignition and controls
- Up to 1.5 GPM flow—handles outdoor showers, RVs, or campsites
- Portable—hang anywhere, no permanent installation needed
- Includes showerhead and hose
- Simple controls and low-pressure startup
Pros:
- More power than electric-only units
- Great for outdoor use or emergencies
- Budget-friendly
Cons:
- Not for indoor, permanent install
- Requires propane and power source
Final Verdict: Best value for portable/outdoor use or off-grid setups.
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Comparison Table: Top 110 Volt Tankless Water Heaters
| Model | Power | Max GPM | Digital Control | Warranty | Best For | Price Link |
|---|---|---|---|---|---|---|
| EcoSmart POU 3.5 | 3.5 kW/120V | 1.0 | No | 1 yr | Sink, RV, bar | View |
| Thermoflow UT10 | 2.0 kW/110V | 0.6 | Yes | 1 yr | Under-sink, office | View |
| Marey GA5PORT | Propane + 110V | 1.5 | No | 1 yr | Outdoor, RV, camping | View |
FAQ: 110 Volt Tankless Water Heaters
- Can a 110V tankless heater supply a shower?
Usually not. These units are designed for sinks or low-flow applications. Standard showers typically need a larger 220V model. - Are they easy to install?
Yes—most simply plug in and connect to water lines. Always follow the manufacturer’s instructions. - Do I need a dedicated circuit?
For safety, it’s best to use a dedicated 15–20 amp circuit. Avoid using with other high-power appliances on the same line. - Can I use one in an RV?
Absolutely. Many RVers use 110V tankless units for sinks or outdoor showers. - How often should I clean my unit?
Flush and descale yearly, especially if you have hard water. Regular cleaning extends lifespan and efficiency.
Conclusion
110 volt tankless water heaters are the perfect solution for on-demand hot water at any sink, bar, RV, or workshop—no bulky tank and no high-voltage wiring needed. Pick from the best models above, follow the buyer’s tips, and enjoy the convenience of instant hot water wherever you need it most. Ready to upgrade? Click through to the best prices and enjoy easy installation in minutes!