If you want reliable, on‑demand hot water for multiple fixtures without waiting, these electric and gas tankless heaters are strong candidates. They’re suited to small homes, apartments, and busy households that need steady temperatures and minimal standby loss. The top picks below emphasize fast heating, smart features, and compact designs. Ideal buyers include apartment dwellers seeking space efficiency, small homes needing 1–2 point-of-use heating, and kitchens or baths that demand constant hot water. The quick-reference table helps you compare core specs at a glance.
| Product | Best For | Flow (GPM) | Notes |
|---|---|---|---|
| Westinghouse 14kW Tankless (Electric) | 2 points of use, smart home | up to 3.4 | WiFi, Alexa/Google Home |
| ThermoMate 14kW Tankless (Electric) | Residential indoor use | up to 3.4 | ETL listed, heavy-duty elements |
| 12kW Electric Tankless (White) | 1–2 fixtures | varies | Self-modulating, compact |
| MIZUDO Gas Tankless | Whole‑home hot water | up to 10.3 | WiFi & app control |
| Orbek 14kW Electric | 3s instant heating | up to 3.38 | ±1°F control, ETL |
Westinghouse 14kW Tankless Electric: Smart, Compact, Quiet
This model delivers up to 3.4 GPM when inlet water is around 62°F and outlet is set near 105°F, enabling two hot-water points of use simultaneously. It’s designed for a dedicated 60A double-pole circuit with 6 AWG wire and 1/2″ NPT connections. The 14kW unit heats water in about three seconds with 98% thermal efficiency, providing fast, endless hot water. Smart WiFi compatibility enables temperature monitoring and control via Alexa or Google Home. A notable feature is temperature memory that recalls your last setting after power loss.
Best for: Homeowners who want two active outlets and smart control from a mobile app or voice assistants. Better for: small apartments or compact spaces where a wall-mounted unit is ideal. Avoid if: your electrical panel cannot support a dedicated 60A circuit. Limitation: requires specific wiring and a compact footprint may limit higher flow needs.
ThermoMate 14kW Tankless Electric: Durable, Instant
This 14kW electric tankless model supports up to 3.4 GPM and is designed for indoor residential use with a focus on longevity. It requires a 60A double-pole circuit, 6 AWG copper wires, and standard 1/2″ NPT water connections. The unit uses a heavy-duty cast aluminum heating element and an iron-chromium-aluminum alloy for improved durability and resistance to scale buildup. It’s suitable for 1–2 fixtures depending on inlet water temperature.
Best for: Homeowners seeking a robust, long-life electric tankless solution for limited spaces. Better for: small households that need reliable hot water without frequent maintenance. Choose this if: you value a robust heating block and corrosion resistance. Limitation: installation prerequisites must be met for best performance.
12KW Electric Tankless: Compact, Self-Modulating
This white unit is designed for 1–2 point-of-use installations with self-modulating technology to maintain steady temperatures. It features a wide 77–131°F (25–55°C) range, delivering instant hot water at the tap with minimal temperature fluctuation. It’s ETL certified and includes protections like dry heating prevention and high-temperature safeguards. Its slim profile helps it fit in tight spaces such as bathrooms, kitchens, or utility closets.
Best for: renters or small homes with limited space needing consistent hot water for basic daily tasks. Better for: bathroom sinks or a compact kitchen setup. Limitation: flow capacity varies with inlet water temperature and fixture count.
MIZUDO Gas Tankless: High Flow, Whole-Home
With up to 10.3 GPM, this gas unit is designed for whole-house hot water supply, suitable for 2–3 bathrooms, kitchens, and laundry needs. It features precise temperature control within ±1°F and an adjustable range up to 149°F. It uses a high BTU input (199,000 BTU) to ensure rapid heating and consistent output. It also supports WiFi and app control for remote management. A caution is that natural gas installation should follow local codes and venting requirements.
Best for: homeowners needing a high-flow, whole-home solution. Better for: larger households with multiple simultaneous hot-water demands. Choose this if: you want app access and precise temperature control. Limitation: gas installations require proper venting and professional setup.
Orbek 14kW Electric Tankless: Fast, Precise
The Orbek model delivers instant hot water in about 3 seconds with 14kW of power and supports simultaneous hot water usage across multiple fixtures. It emphasizes temperature stability within ±1°F and a broad 86–140°F range. It includes overheat and dry combustion protection, ETL certification, and a high-efficiency design with up to 98% thermal efficiency.
Best for: households needing rapid, stable hot water with flexible temperature control. Better for: those who want a compact electric unit with strong performance. Limitation: like all small- to mid-range electric tankless units, flow may drop with very cold inlet water or high concurrent demand.
Buying Guide: Key Purchase Considerations
- Power source and electrical capacity: Electric models typically require a dedicated 60A circuit and 6 AWG wiring. Check your panel capacity before purchase. Gas units demand proper venting and gas line considerations.
- Flow rate and fixture planning: Estimate your needed GPM for the number of fixtures you expect to run at once. Two to three fixtures generally require higher input units.
- Temperature control: Look for precise control within ±1°F when you need stable water temperature, especially in climates with cold inlet water.
- Space and installation: Compact, wall-mounted designs save space and are ideal for apartments. Ensure clearance for venting if you choose gas.
- Smart features: WiFi or app-based controls, and compatibility with Alexa/Google Home, can simplify operation and monitoring.
- Durability and protections: ETL certification, anti-scaling design, dry‑fire protection, and thermal protection improve longevity and safety.
- Maintenance considerations: Some units use cast aluminum heating blocks and corrosion-resistant alloys to extend life and reduce scale buildup.
Frequently Asked Questions
- What is a tankless water heater’s main advantage for never getting cold water? Answer: Tankless systems heat water on demand, so hot water is supplied as long as there’s flow, with minimal standby heat loss.
- How do I know which GPM to pick? Answer: Estimate the number of fixtures you’ll run at once and consider typical flow per fixture (e.g., shower ~1.5–2.0 GPM, faucet ~0.5–1.5 GPM).
- Do all tankless heaters require professional installation? Answer: Most electric units require a dedicated circuit and proper wiring; gas units typically require professional venting and gas line connections.
- Can electric tankless heaters be used in apartments? Answer: Yes, especially compact electric models designed for 1–2 fixtures, but panel capacity must be verified.
- Is WiFi control essential? Answer: It’s convenient for remote monitoring and settings but not required for operation.
- What maintenance is needed for tankless heaters? Answer: Regular descaling in hard-water areas and periodic checks of venting (for gas) and electrical connections help maintain performance.