EcoSmart ECO 8 Tankless Water Heater
- Water Heater
- 2 gallons
- 8000 watts
- 8000 watts
A point-of-use electric tankless heater that works well for a single low-flow fixture, provided the household electrical service and incoming water temperature match what an 8kW unit can actually deliver.
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How it ranks among the 10 water heaters we track
4.2★ across 709 Amazon ratings, Bayesian-smoothed toward the category average.
709 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
50+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 10 water heaters we track - how the scorecard works · full water heaters data report. Confidence: high - strong rating volume and complete data.Updated 8 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The EcoSmart ECO 8 is an 8-kilowatt electric tankless water heater sized for a single point of use, such as a bathroom sink, small shower, or office breakroom, delivering roughly 0.8 to 1.9 gallons per minute depending on how cold the incoming water is.
As an 8kW unit this sits at the small end of EcoSmart's tankless lineup, meant for one low-flow fixture rather than a whole house. Output swings with incoming water temperature, so the same unit gives less usable hot water in a cold climate winter than in a warmer region. The listing points buyers to a sizing guide before purchase, which matters more here than with a storage tank heater since undersizing shows up immediately as lukewarm water.
- 8-kilowatt electric tankless heater
- 0.8 to 1.9 GPM output depending on inlet temperature
- Compact 12 x 8 x 4 inch footprint
- Built for point-of-use fixtures
Who it's for
Fits anyone adding hot water to one fixture, like a half-bath, workshop sink, or breakroom, where space is tight and a full tank heater is not practical. Not sized for whole-house or multi-fixture simultaneous use.
Strengths and trade-offs
Drawn from this product's published specifications.
- Compact tankless design frees up installation space
- No standby heat loss between uses
- Suited to point-of-use fixtures like a small sink
- Output drops in colder incoming water conditions
- Only rated for one low-flow fixture, not whole-house use
- Requires checking a sizing guide before buying
Performance notes
Being tankless, it heats water only as it flows through rather than storing a heated reserve, so there is no standby heat loss between uses. Output capacity depends directly on the temperature of the incoming water, which is why the listing specifies a range of 0.8 to 1.9 gallons per minute rather than a single number. Matching the unit to the right fixture and climate, per the manufacturer's sizing guide, determines whether it feels adequate or underpowered.
Specifications
| Brand | EcoSmart |
|---|---|
| Model | ECO 8 |
| Dimensions & fit | |
| Item Weight | 4.8 pounds |
| Item Dimensions W x H | 8 × 11.5 inches |
| Item Depth | 4 inches |
| Capacity & performance | |
| Capacity | 2 gallons |
| Heat Output | 8000 watts |
| Flow Rate | 2 gpm |
| Power & efficiency | |
| Wattage | 8000 watts |
| Power Source | Corded electric |
| Voltage | 240 volts |
| Efficiency | 99.8% |
| Construction & materials | |
| Material Type | Stainless Steel |
| Color | White |
| Compatibility & installation | |
| Mount Type | Wall |
| Included components | |
| Unit Count | 1 |
| Number of Packs | 1 |
| Included Components | electric tankless water heater |
| Warranty & support | |
| Manufacturer Warranty Description | Lifetime |
| Other details | |
| Number of Items | 1 |
| Item Type Name | Electric Tankless Water Heater |
| Manufacture Year | 1987 |
| Special Features | LED Display |
| Style Name | ECO 8 |
How it compares
This product against the closest alternatives we track in water heaters.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| EcoSmart ECO 8 Tankless Water HeaterThis product | 4.2 / 5 | 709 | 4.0 / 5 |
| Stiebel Eltron 233219 2.5 gallonStiebel Eltron | 4.6 / 5 | 462 | 4.2 / 5 |
| CAMPLUX 5L Portable Tankless Water HeaterCamplux Enjoy Outdoor Life | 4.2 / 5 | 3,346 | 4.1 / 5 |
| GASLAND BS158 Outdoor Portable Gas Water Heater 1.58GPMGasland | 4.3 / 5 | 1,400 | 3.9 / 5 |
| Electric Mini Tank Water Heater UL Listedthermomate | 4.3 / 5 | 764 | 3.9 / 5 |
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Questions about the EcoSmart ECO 8
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What size fixtures can the EcoSmart ECO 8 handle?
It is built for point-of-use applications like a bathroom sink, small shower, or breakroom tap, not for running multiple fixtures at once.
Does the EcoSmart ECO 8 output change with the season?
Yes, output ranges from about 0.8 to 1.9 gallons per minute depending on how cold the incoming water is, so colder inlet water lowers usable flow.
Is the EcoSmart ECO 8 a good whole-house water heater?
No, at 8 kilowatts it is sized for a single low-flow fixture rather than whole-house demand; check EcoSmart's sizing guide for larger needs.