For buyers seeking endless hot water with minimal wait and energy efficiency, on-demand tankless electric or gas heaters are a strong choice. This guide highlights five well-suited options that deliver reliable hot water, even in peak use. Ideal for small homes, apartments, or multi-point setups, these models target different needs—from compact electric units for point-of-use to high-capacity gas systems for whole-home use. The following selections emphasize consistent temperature, quick heating, and smart controls to help you pick the best fit.
Quick reference table of selected products:
| Product | ||||
|---|---|---|---|---|
| Westinghouse 14kW Electric Tankless | Up to 3.4 | WiFi with Alexa/Google Home | ||
| ThermoMate 14kW Electric Tankless | Up to 3.4 | Touch control, ETL certified | ||
| 12KW Electric Tankless | Up to 3.0–3.4 | Slim, space-saving design | ||
| MIZUDO Gas Tankless | Up to 10.3 | App control, high BTU | ||
| Orbek 14kW Electric Tankless | Up to 3.38 | ±1°F temperature control |
Westinghouse 14kW Electric Tankless Water Heater
This 14kW electric unit provides hot water on demand for two points of use, with a compact wall-mount design. It supports up to 3.4 GPM when inlet water is around 62°F and outlet is set to 105°F, making it best for apartments or small homes needing simultaneous usage at two fixtures. The model includes smart WiFi that works with Alexa and Google Home, plus a temperature memory function that restores your last setting after a power outage. A dedicated 60A circuit and 6 AWG wiring are required for optimal performance.
Best for: small homes or multi-point setups where smart control and fast response matter.
Why chosen: It combines instant heating, reliable output, and smart features in a compact package.
Caution: Requires significant electrical capacity and professional installation to ensure safety and performance.
ThermoMate 14kW Electric Tankless With Touch Control
This 14kW unit is designed for residential indoor use with up to 3.4 GPM throughput. It requires a 60 Amp double-pole breaker and 6 AWG copper wire. The heater uses a heavy-duty cast aluminum heating element and an iron-chromium-aluminum alloy to support durable performance and better resistance to mineral buildup. Excellent for households needing steady hot water for 1–2 fixtures, such as a shower and sink, especially in tight spaces.
Best for: homes with limited space seeking durable, stable temperature control.
Why chosen: Combines strong GPM with robust construction and a modern touch-control interface.
Caution: Adequate electrical capacity is essential for reliable operation.
12KW Electric Tankless Water Heater
This compact 12KW unit focuses on immediate hot water with a wide 77–131°F temperature range. It’s ETL-certified and emphasizes safety protections like dry heating prevention and high-temperature protection. It is best suited for apartments, utility closets, or small kitchens where space is at a premium. The unit supports 1–2 fixtures depending on inlet temp and demand, delivering consistent output without the wait associated with tanks.
Best for: tight spaces needing reliable on-demand water with solid safety features.
Why chosen: Space-saving design paired with practical protection features for daily use.
Caution: Temperature consistency can depend on incoming water temperature.
MIZUDO Gas Tankless Water Heater
This high-BTU gas model delivers up to 10.3 GPM, ideal for whole-house hot water across two to three bathrooms. It features precise temperature control within ±1°F and a maximum setting up to 149°F, with options suitable for deep soaking or heavy dishwasher use. WiFi-enabled app control adds convenience for monitoring and adjustment from a smartphone. It’s CSA certified, making it a strong pick for larger households requiring simultaneous hot water from multiple fixtures.
Best for: larger homes with high hot-water demand.
Why chosen: Higher flow rate and flexible temperature control help prevent cold showers during peak usage.
Caution: Gas installation and venting require professional service and proper clearance.
Orbek 14kW Electric Tankless
Orbek’s 14kW model provides instant hot water with a 3-second heat-up and precise temperature control within ±1°F, suitable for running multiple fixtures at once. It claims high efficiency with ETL certification and a 98% thermal efficiency, helping to reduce energy usage compared to traditional tank systems. The unit supports up to 3.38 GPM, making it a strong option for compact homes seeking reliable performance and advanced safety features like overheat protection.
Best for: compact to mid-sized homes needing precise temperature control.
Why chosen: Combines rapid heating, high efficiency, and robust protection features.
Caution: On occasion, extreme inlet temperatures may affect performance; proper sizing is important.
Buying Guide: How to Choose Your On-Demand Water Heater
What capacity do you need? Determine the maximum simultaneous hot-water demand in GPM by listing fixtures (shower, sinks, dishwasher) and estimating peak flow. Electric models typically range from 2–3.4 GPM per unit; gas models can exceed 6–10 GPM when multi-point use is expected.
Electric vs gas: Electric tankless heaters are easier to install in many retrofit scenarios and are ideal for apartments and small homes. Gas models deliver higher flow for whole-house use, but require venting and professional installation.
Electrical/vital requirements: Electric units usually demand a dedicated high-amperage circuit (often 60A) and appropriately rated wire (6 AWG). Confirm panel capacity to avoid tripping or electrical issues.
Temperature control and stability: Look for units with tight temperature control (±1°F) and memory features to restore settings after outages. Smart controls add convenience but ensure compatibility with your preferred ecosystem (Alexa, Google Home).
Space and installation: Consider wall-mounted, compact designs for tight spaces. If you’re replacing a tank, ensure the new unit’s connections and clearance fit your cabinet or closet layout.
Durability and maintenance: Components resistant to scale buildup and corrosion extend lifespan, particularly in hard-water areas. Check material quality of the heating element and any protective coatings.
Frequently Asked Questions
- What size water heater should I choose for a two-bath home? For two bathrooms, a high-flow unit (approximately 6–10 GPM gas) or two smaller electric units running in parallel can meet peak demand efficiently.
- Do electric tankless heaters require venting? No, electric models do not require venting, but they need a suitable electrical supply and breaker capacity.
- Can I install a tankless water heater myself? Some simple electric models may be DIY-friendly, but gas models and any installation involving electrical work should be performed by a licensed professional.
- Will a tankless heater provide endless hot water? Yes, when properly sized for your demand, tankless systems offer continuous hot water without the typical tank recovery period.
- Is WiFi control worth it? Smart controls add convenience and scheduling, especially for homes with variable schedules, but ensure reliable connectivity and compatibility with your devices.
- What is “GPM” in this context? GPM stands for gallons per minute and indicates the amount of hot water a unit can deliver at a given temperature rise. Higher GPM means more simultaneous use capability.