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An under sink tankless water heater puts hot water right where you need it. Small tankless and mini-tank heaters for kitchen sinks, bathroom faucets, showers, garages and tiny homes.
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A point-of-use water heater sits close to the fixture it serves, usually under a sink, in a vanity or on the wall near a shower. Because the hot water travels only a short distance, you get it almost instantly and waste less water waiting. Point-of-use units come in two styles: tankless (heats on demand) and mini tank (stores 2.5–7 gallons).
| Use | Recommended type | Typical power |
|---|---|---|
| Hand washing, bathroom faucet | 120V point-of-use tankless | 2.5–3.5 kW |
| Kitchen sink | Mini tank or 240V point-of-use tankless | 1.4 kW mini tank / 6–9 kW tankless |
| Single shower (warm climate) | 240V tankless | 9–13 kW |
| Single shower (cold climate) | 240V tankless | 13–18 kW |
| Tiny home or cabin | 240V tankless or small propane unit | 18–27 kW |
A standard 120V tankless water heater (sometimes called 110 volt) is easy to install but limited by the circuit: about 3.5 kW maximum. That makes it great for hand washing at 0.5 GPM, but not enough for a shower or a full kitchen faucet. 240V units deliver far more heat and suit showers and kitchen sinks, but need a dedicated double-pole breaker.
Shoppers often search for a 120v tankless water heater electric, 110 volt tankless water heater or under sink tankless water heater 120v. These small water heaters electric units are ideal for hand washing. For a tankless water heater for shower use, or any electric water heater for shower, step up to 240V. A mini tankless water heater or compact tankless water heater fits inside a vanity.
Brands currently listed in this category: Stiebel Eltron, Chronomite, Marey, Ariston and Eccotemp. Learn more in our point-of-use tankless water heater guide.
Usually not well. A 120V unit is limited to about 3.5 kW, which gives only around 0.5 GPM at a useful temperature rise. For a shower, look at 240V units of 9–18 kW or more, depending on your climate.
A point-of-use tankless heater warms water as it flows and never runs out, but has limited flow. A mini tank (2.5–7 gallons) stores a small amount of hot water, delivers it at full faucet flow and plugs into a standard 120V outlet in many cases, but it can run out.
Yes. Many homes add one at a far sink to deliver instant hot water while the main heater's water travels through the pipes. It saves water you would otherwise waste waiting.
Some small 120V units and mini tanks have a plug; others must be hardwired. Check the product's electrical requirements and use a dedicated circuit where the manual requires one.
