Tankless water heaters

Tankless water heaters provide several notable benefits compared to traditional tank models. They are highly energy-efficient because they only heat water when needed, eliminating the standby energy loss of keeping water constantly heated in a tank. This can lead to significant savings on energy bills over time. Their compact design saves space, making them ideal for smaller homes or areas with limited room. Tankless units also offer an endless supply of hot water, making them suitable for households with high hot water demands. Additionally, they have a longer lifespan and typically require less maintenance. While the initial cost is higher, the long-term energy savings, continuous hot water, and space-saving design make tankless water heaters a smart investment.

Best Overall

Stiebel Eltron Tempra 36 Trend

Tankless Water Heater

This electric tankless water heater offers a high flow rate of 7.5 GPM, sufficient for large homes with multiple simultaneous showers. It operates nearly silently and includes auto-modulation for energy efficiency. Pros: High efficiency (99%), digital display, consistent water temperature. Cons: Some users report low water pressure.

Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White

Best Whole-House

Rinnai RL75iN Natural Gas

Tankless Water Heater

Provides a maximum flow rate of 7.5 GPM and can supply hot water to multiple fixtures. It includes a built-in leak detection system and Wi-Fi compatibility for remote monitoring. Pros: Suitable for small- to medium-sized families, high heating power (180,000 BTU). Cons: Requires venting and additional components for recirculation.

NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU

Best Budget

EcoSmart ECO 27 Electric

Tankless Water Heater

This budget-friendly electric heater supports a flow rate of up to 6.5 GPM and includes self-modulating technology to maintain consistent water temperatures. Pros: Affordable, compact size, limited lifetime warranty on heating elements. Cons: Maximum temperature of 140°F, no Wi-Fi integration.

30%

EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW - Quantity 1, 17 x 17 x 3.5

$599.00

Best Point-of-Use

Rheem RTEX-13 Electric

Tankless Water Heater

This small unit is designed for specific fixtures and can be installed under sinks or in closets. It offers up to 3.17 GPM and electronic temperature control. Pros: Compact, easy to install, precise temperature control. Cons: Limited to point-of-use applications, shorter warranty on heat exchanger.

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

Most Efficient

EcoSmart ECO 18 Electric

Tankless Water Heater

Known for its advanced self-modulating technology, it ensures minimal energy usage and offers up to 5 GPM. Pros: High efficiency, compact design, lifetime warranty for residential use. Cons: Requires professional installation due to electrical demands.

11%

EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

$360.16