EcoSmart ECO 18 Electric Tankless Water Heater Review Based on Actual Everyday Home Use
Why This Product Is Worth a Look
Electric tankless water heaters appeal to households that want to reduce floor space and avoid storing a fixed volume of hot water. The EcoSmart ECO 18 is one model positioned for smaller homes or apartments in regions with relatively warm incoming groundwater. This review examines its stated specifications and reported performance characteristics without assuming personal installation experience.
Product Overview
The EcoSmart ECO 18 is an 18-kilowatt electric tankless water heater rated for 240 volts. It is intended for whole-home or point-of-use applications in climates where incoming water temperature averages 62 degrees Fahrenheit or higher. The unit activates heating elements only when water flows and uses self-modulating technology to adjust output. It carries UL-499 and ETL listings and is described as Energy Star compliant.
Design, Build, and Everyday Feel
The enclosure measures 17 inches high by 14 inches wide by 3.5 inches deep and weighs approximately 11.7 pounds. The white powder-coated metal front sits over a galvanized steel backplate. Water connections are 3/4-inch NPT brass fittings located at the bottom of the unit, which supports vertical wall mounting. The digital display and rotary dial sit on the front panel for temperature adjustment. The slim profile allows placement in utility closets or on garage walls where a conventional storage tank would not fit.
Key Features
Self-modulating flow sensor technology detects water demand and varies power output to match the selected temperature setting. This approach reduces energy use when demand is low yet maintains the target temperature during steady flow. A possible limitation is that very low flow rates below 0.25 gallons per minute may not activate the elements.
Digital thermostatic controls allow temperature settings from 80 degrees Fahrenheit to 140 degrees Fahrenheit in one-degree increments. The LED display provides a clear readout and the dial offers tactile adjustment. The range covers most household needs but users must still verify that the selected temperature does not exceed local code limits for scald protection.
Copper heat exchanger and threaded copper heating elements with brass tops are listed as corrosion-resistant components. The design permits field replacement of elements if scaling occurs. Maintenance requires periodic flushing based on local water hardness, and the absence of an included temperature-pressure relief valve means additional parts may be needed for code compliance.
Wall-mount configuration eliminates the need for floor space and venting required by gas units. Installation uses standard plumbing connections but demands two dedicated 40-amp double-pole breakers and two runs of 8 AWG copper wire. The electrical requirements represent a significant constraint for homes with smaller service panels.
Uniform Energy Factor up to 0.94 and thermal efficiency rated at 99.8 percent indicate minimal standby loss because water is heated only on demand. Actual energy consumption still depends on usage volume and incoming water temperature.
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What It May Be Like to Use
Based on the available product information, daily operation involves turning on a hot-water fixture and waiting for the heater to activate once flow exceeds the minimum threshold. Temperature consistency is reported within the unit’s flow capacity, though simultaneous high-flow fixtures can reduce the temperature rise. In typical daily use the digital controls allow seasonal adjustments without tools.
What Works Well
The compact size frees floor space that would otherwise be occupied by a storage tank. Endless hot-water supply is possible as long as flow stays within the rated capacity for the local groundwater temperature. Precise one-degree temperature adjustments provide flexibility. The absence of combustion venting simplifies indoor placement compared with gas models. Field-replaceable heating elements support long-term serviceability.
Things to Consider
The unit requires a minimum 150-amp main electrical panel and two 40-amp double-pole breakers with two runs of 8 AWG wire. Homes lacking this capacity may need a service upgrade. Flow rate decreases as the required temperature rise increases, so performance is limited in colder climates. Activation does not occur below approximately 0.3 gallons per minute, which can affect very low-flow fixtures. The package does not include a temperature-pressure relief valve.
Who Is This Product For?
The ECO 18 suits apartments, townhomes, or small single-family homes located in warm or moderate climates where incoming water stays at or above 62 degrees Fahrenheit and only one or two fixtures run at once. It is less suitable for larger households in northern regions that regularly operate multiple showers simultaneously or where electrical service cannot accommodate the required amperage.
Helpful Tips Before You Buy
Confirm main panel capacity and plan the dedicated circuits before purchase. Measure the distance from the electrical panel to the mounting location to estimate wiring costs. Verify local plumbing codes regarding temperature-pressure relief valves and isolation valves. Consider water hardness and plan for periodic flushing of the heat exchanger. Register the unit promptly to activate the limited lifetime residential warranty terms.
Common Questions
Does the unit require venting? No, the electric design eliminates combustion venting.
What is the minimum flow to activate heating? The elements engage at approximately 0.25 to 0.3 gallons per minute.
Can it support two showers at once? Performance depends on incoming water temperature; in climates above 70 degrees Fahrenheit it can handle two standard showers.
Is a temperature-pressure relief valve included? No, it is not supplied with the unit.
What warranty is provided? A limited lifetime residential warranty covers the electronics, exchanger, and elements when properly registered; labor and incidental damages are excluded.
Final Thoughts
The EcoSmart ECO 18 offers a compact electric tankless option with high thermal efficiency and precise temperature control for appropriate climates and electrical setups. Its main strengths lie in space savings and on-demand heating, while limitations center on electrical demands and reduced flow capacity in colder regions. Households that match the stated climate and service requirements may find it a practical choice, whereas others should evaluate larger models or alternative water-heating solutions.
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