EcoSmart ECOS 27
#7 in ElectricFull review
A low cost whole home heater for a two bathroom house in a warm climate. The short warranty is the tradeoff for the price.
Amazon $549$549
The EcoSmart ECOS 27 rates 3.3 among electric tankless water heaters; the Noritz NRC661-DV rates 2.5 among gas ones. The EcoSmart ECOS 27 costs $731.09 less ($549 vs $1,280.09).
Noritz NRC661-DV
#20 in GasFull review
A compact condensing heater for a smaller home that wants PVC venting, though bigger rivals cost little more.
Amazon $1,280.09 Amazon $1,470.40$1,280.09
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different fuel classes (electric and gas), and each is scored against the reference points for its own class, so a rating says how well each does among its own fuel peers. How we rank explains each factor.
| Factor weight | EcoSmart ECOS 27 | Noritz NRC661-DV |
|---|---|---|
| Overall rating | 3.3/5 | 2.5/5 |
| Value 35% | 60 $20.33 per kW ($549, 27 kW) | 11 $10.67 per 1,000 BTU/h ($1,280.09, 120,000 BTU/h) |
| Heating power 25% | 64 27 kW | 0 120,000 BTU/h |
| Efficiency 15% | 50 0.94 UEF | 56 0.89 UEF |
| Warranty 25% | 29 5-year heat exchanger warranty | 70 12-year heat exchanger warranty |
Specifications
| EcoSmart ECOS 27 | Noritz NRC661-DV | |
|---|---|---|
| Heating | ||
| Fuel | Electric | Gas |
| Gas type | - | Natural gas or propane |
| Gas input | - | 15,000 to 120,000 BTU/h |
| Electric power | 27 kW | - |
| Max flow | 6.6 GPM | 6.6 GPM |
| UEF | 0.94 | 0.89 |
| Condensing | - | Yes |
| ENERGY STAR | - | Yes |
| Installation | ||
| Venting | - | Indoor |
| Vent type | - | Schedule 40 PVC |
| Voltage | 240 V | - |
| Breakers | 120 A total | - |
| Weight | 10.9 lb | 39 lb |
| Features | ||
| Built-in recirculation | No | No |
| Wi-Fi | No | No |
| Heat exchanger warranty | 5 years | 12 years |
| Parts warranty | 1 year | 5 years |