EcoSmart ECO 11
#5 in ElectricFull review
For a single shower or a pair of sinks in a warm climate, with a lifetime warranty if a pro installs it.
Amazon $244.78$244.78
3.3/5
A low cost whole home heater for a two bathroom house in a warm climate. The short warranty is the tradeoff for the price.
- 27 kWHeating power
- 6.6 GPMMax flow
- 0.94UEF
- 5 yearsHeat exchanger warranty
Check price at Amazon$549
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Two showers at once in warm climates
- Costs less per kilowatt than most whole home heaters
- Light and compact for a 27 kW unit
Cons
- Only a 5 year leak warranty and 1 year on parts
- Draws 112.5 A, so it needs 200 A service in most homes
- Lower efficiency than the Stiebel Tempras
The EcoSmart ECOS family
Every EcoSmart ECOS model we rank, smallest first. Ratings compare each against its own fuel.
| Model | Heating power | Rating | Price |
|---|---|---|---|
| EcoSmart ECOS 18 | 18 kW | 2.9/5 | $449 |
| EcoSmart ECOS 27 (this one) | 27 kW | 3.3/5 | $549 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its fuel. How we rank explains each one.
Specifications
| Model number | ECOS 27 |
|---|---|
| Heating | |
| Fuel | Electric |
| Electric power | 27 kW |
| Max flow | 6.6 GPM |
| UEF | 0.94 |
| Installation | |
| Voltage | 240 V |
| Breakers | 120 A total |
| Weight | 10.9 lb |
| Features | |
| Built-in recirculation | No |
| Wi-Fi | No |
| Heat exchanger warranty | 5 years |
| Parts warranty | 1 year |
Alternatives in this fuel
Westinghouse WET-24K-G
#6 in ElectricFull review
For buyers who want app control on a whole home electric heater. Without published warranty terms, the Stiebel Tempra 24 Trend is the safer buy at the same price.
Amazon $499.99$499.99
EcoSmart ECO 8
#8 in ElectricFull review
For a faucet far from the main water heater. A lifetime warranty at a low price makes it a safe point of use pick if you hire the install out.
Amazon $219$219
Compare
Compare the EcoSmart ECOS 27 with any other tankless water heater →
More from EcoSmart: every EcoSmart product ranked.