Rheem RTG-70DV
#5 in GasFull review
A budget indoor heater from a major brand for a two bathroom home in a moderate climate.
Amazon $653.77 Amazon $785.13$653.77
The Rheem RTG-70DV is the better tankless water heater overall, rated 4.1 to 3.2. The Rheem RTG-70DV leads on warranty and heating power. The Eccotemp SmartHome SH22i costs $154.77 less ($499 vs $653.77).
Eccotemp SmartHome SH22i
#18 in GasFull review
An affordable smart heater for a small home that wants app control without paying for a premium brand.
Amazon $499 Amazon $499$499
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.
Which should you buy?
- Choose the Rheem RTG-70DV for warranty (15-year heat exchanger warranty vs 5-year heat exchanger warranty) and heating power (160,000 BTU/h vs 140,000 BTU/h).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gas tankless water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Rheem RTG-70DV | Eccotemp SmartHome SH22i |
|---|---|---|
| Overall rating | 4.1/5 | 3.2/5 |
| Value 35% | 98 $4.09 per 1,000 BTU/h ($653.77, 160,000 BTU/h) | 100 $3.56 per 1,000 BTU/h ($499, 140,000 BTU/h) |
| Heating power 25% | 51 160,000 BTU/h | 25 140,000 BTU/h |
| Efficiency 15% | 12 0.82 UEF | 50 UEF not published (neutral score used) |
| Warranty 25% | 100 15-year heat exchanger warranty | 0 5-year heat exchanger warranty |
Specifications
| Rheem RTG-70DV | Eccotemp SmartHome SH22i | |
|---|---|---|
| Heating | ||
| Fuel | Gas | Gas |
| Gas type | Natural gas or propane | Natural gas or propane |
| Gas input | 11,000 to 160,000 BTU/h | 140,000 BTU/h |
| Max flow | 7 GPM | 6.8 GPM |
| UEF | 0.82 | - |
| Condensing | No | No |
| Installation | ||
| Venting | Indoor | Indoor |
| Vent type | 3 in x 5 in concentric Category III stainless | - |
| Weight | 46.5 lb | - |
| Features | ||
| Built-in recirculation | No | No |
| Wi-Fi | No | Yes |
| Heat exchanger warranty | 15 years | 5 years |
| Parts warranty | 5 years | 2 years |