If you’re trying to heat water in a small space—like a sink, RV, or cottage—you probably don’t need a full-size 240V system. A 110V tankless water heater gives you hot water on demand without heavy wiring or space-hogging tanks.
What You Should Know Before Buying
110V tankless units are made for light use. Don’t expect to power a shower or multiple taps. These heaters are ideal for:
- Kitchen sinks
- Bathroom vanities
- RVs or campers
- Outdoor bars or basins
They’re compact, easy to install, and cost less than full-size systems. Just know the limitations. Most 110V models produce hot water at 0.5 GPM or less.
Top 110V Tankless Water Heaters (2025 Picks)
1. Thermoflow UT10
Power: 3.5 kW
Flow Rate: 0.5 GPM
Price: $150–$180
The Thermoflow UT10 is compact, fast, and works well for handwashing or cleaning at a small sink. The digital temperature control makes it easy to adjust. It fits neatly under your cabinet and runs on a standard 110V outlet with a 30-amp breaker.
2. Bosch Tronic 3000 US3
Power: 3.4 kW
Flow Rate: 0.4–0.5 GPM
Price: $130–$160
This unit heats water instantly at point-of-use, with minimal lag. You’ll appreciate its quiet performance and long-term durability. Ideal for RVs or cabins where you need hot water at one sink only.
3. ECOTOUCH 110V Tankless Heater
Power: 3.0 kW
Flow Rate: 0.3–0.5 GPM
Price: $100–$120
The ECOTOUCH comes with overheat protection and smart sensors. It’s user-friendly and great for bathroom sinks. You get consistent warm water for daily use, and the price stays under $120.
Pros and Cons of 110V Tankless Water Heaters
| Pros | Cons |
|---|---|
| Easy to install | Low water output (not for showers) |
| Affordable price | Limited temperature rise at high flow |
| Perfect for sinks or RVs | Needs dedicated breaker (30A) |
Expert Tip
“Don’t try to use a 110V tankless heater for a full household setup. They’re made for specific tasks. Match the heater to your water demand.” — Kevin Lu, licensed master plumber, SmartFix Plumbing
Installation Tips
- Use a 30A dedicated circuit
- Mount close to the sink to avoid heat loss
- Use low-flow aerators to improve heating performance
Alternatives to Consider
If you need to power a shower or multiple fixtures, switch to a 240V unit like the Stiebel Eltron Tempra 24 Plus. For smaller needs but better consistency, check out a mini tank heater with 2.5–4 gallons of hot water storage.
Best Uses for 110V Units
RV or Off-Grid Sinks
These heaters work well with solar setups or battery inverters. They heat small amounts of water fast, and they don’t need high voltage.
Under-Sink Instant Heat
110V tankless units give you warm water in seconds at the point of use. No waiting, no bulky storage.
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FAQ: 110V Tankless Water Heaters
Can a 110V tankless water heater run a shower?
No. These units don’t provide enough power to heat water at shower flow rates. You need at least a 240V model.
What size breaker do I need for a 110V tankless heater?
Most units require a dedicated 30-amp breaker. Always check the manufacturer’s specs.
How hot can a 110V heater get the water?
At very low flow rates (0.3–0.5 GPM), you can get water up to 120°F depending on inlet temperature.
Can I install it myself?
If you’re comfortable with basic plumbing and have an existing outlet, yes. For wiring, you may need a licensed electrician.
What’s the difference between tankless and mini tank water heaters?
Tankless heats on demand. Mini tank stores a few gallons. Mini tanks give slightly better flow but take up more space.
Final Thoughts
You don’t need to overbuild. If you’re just heating water for a sink or cleaning area, a 110V tankless water heater gets the job done without bulky equipment. The Thermoflow UT10 and Bosch Tronic 3000 are your best bets for 2025.
Looking for full-house options? Head over to our Stiebel Eltron review and compare the best 240V heaters.