Below is the table which shows the top 6 best tankless electric water heater for the whole house 2018. Each and every tankless electric water heater for the whole house is chosen by our specialist reviewers.

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# 1 - Stiebel Eltron Tempra Plus 29 Kw, Tankless Electric Water Heater With Self-modulating Power Technology & Advanced Flow Control

Stiebel Eltron Tempra 29 plus electric tank less water heater, 208/240 volts the tempra plus is the most technologically advanced tank less water heater available on the market today. The tempra series has been redesigned completely inside and out - upgraded heavy-duty electronics, a simple single flow sensor design, a hinged cover for easy access, and advanced flow control for the tempra plus. Welcome to the next generation of German quality. The tempra has several advantages over a gas-type tank less water heater. Compared to many similar gas tank less models the tempra is less expensive to purchase. Installation is…


  • Digital temperature control
  • Proven reliability
  • No venting required
  • Sleek design fits anywhere
  • Save at least 15-20% on the hot water portion of your electric bill


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# 2 - Bosch Electric Tankless Water Heater

The compact and powerful BOSCH WH17 Tronic 6000 will supply your entire house with hot water when and where you need it. This tankless electric water heater works "on-demand" to eliminate the wait for hot water. This heater works at 97% thermal capacity, reducing any stand by water loss. The built-in flow sensor ensures a constant output temperature across all applications. This heater delivers hot water to 1-3 major applications at a time, anywhere from a residential home to an office space. GPM output at temperature rise of: 75 degrees: 1.6 output, 60 degrees: 2.0 output, 45 degrees: 2.3 output.


  • 17.3 kW tankless whole house electric water heater provides hot water when needed, for as long as needed
  • Polymer encased elements & built-in flow sensor ensures constant output temperature
  • Can be installed virtually anywhere for commercial or residential applications
  • 97% thermal efficiency with minimal stand-by loss
  • External temperature control knob & superior temperature stability and control


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# 3 - Takagi T-t-kjr2-os-lp Outdoor Tankless Water Heater, Propane

The T-KJr2-OS-LP model is the smallest unit in the Takagi line-up The T-KJr2-OS-LP is perfect for light residential ie small apartment units and radiant heating applications This small but powerful unit with gas inputs up to 140000 BTU per hour can m...


  • Outside installation only; Includes internal freeze protection
  • 19,500 - 140,000 BTU/hr
  • 0.82 energy factor
  • 6.6 GPM max flow rate


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# 4 - Marey Eco180 18kw 4.4 Gpm 220v Self-modulating Multiple Points Of Use Tankless Electric Water Heater For The Whole Us Territory, Small, Silver

The 220V ECO180 unit by Marey provides 18kW of power, being the perfect solution for multiple points of use in the southern areas of the US (up to 3 points of use simultaneously in such locations). This unit provides 31°F increase at 4.4 GPM, allowing you to have multiple points of use running simultaneously in hot climates. If you live in colder regions, this unit can reach up to 80°F at 1.5GPM for hot water output at one point of use at time. Marey´s ECO180 is ETL approved and recommended for the whole US territory. This unit must be installed…


  • The 220V eco 18Kw unit requires (2) 50 amp breakers and must be installed by a professional plumber or electrician to ensure safety and quality
  • German-designed with high quality stainless steel water channel and heating chamber
  • Smart technology: easy management and simple adjustments on a LCD panel allows you to program the exact desired water temperature thereby optimizing electricity consumption
  • Recommended for 2 simultaneous Showers (2.0 gpm each) in hot climates (US Southern regions). in colder regions it is suitable to provide hot water to a shower at 2.0 gpm
  • Tankless water heaters save energy because they use up to 60% less energy than conventional tank water heaters. As a result, they are cost effective and environmentally friendly


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# 5 - Atmor At-910-24tp Thermopro 24 Kw / 240v 4.6 Gpm Digital Thermostatic Tankless Electric Instant Water Heater

The Atmor thermopile tankless electric water heater revolutionizes water heating with smart flow technology that provides unlimited hot water when you need it, without the wait. An advanced self-modulating system regulates water flow and the amount of energy required to heat the water. This delivers major savings on energy bills and lowers water consumption. The easy-to-use digital panel allows full control with the power to make temperature adjustments down to the exact degree for the perfect water temperature every time. Compact, space-saving design requires no venting and can be installed anywhere inside your home or garage. Unit is IP54 certified…


  • Digital temperature control allows you to set your temperature in increments of 1ø
  • Requires 3 x 40a single-phase DP breakers, 3 x 8 AWG wires, 240V. 100a total connected load
  • Specially equipped to heat incoming water as low as 37øf at 2.45 gpm
  • Industries only unit to receive splash-proof IP54 certification, allowing point of use installation near showers and sinks
  • Save up to 50% on electric bills compared to a traditional tank water heater