State ACTH-199M-(N,P) 1**
State ACTH-199M-(N,P) 1** is in the DOE listing as of Oct 19, 2026. State ACTH-199M-(N,P) 1** is in the ENERGY STAR list as of Oct 19, 2026.
- Gas tankless water heater
- 1 listed model
Its figures are also listed under A. O. Smith ACTH-199M-(N,P) 1**.
Certified figures
- Flow at a 67°F rise
- 5.8gallons per minute
- UEF
- 0.95Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
A bigger rise from colder incoming water leaves the heater with less flow.
- Cold water
- Cold water must be at least 10°F colder than the hot water setting.
- Flow estimate
- The estimate uses the lowest certified flow among the listed models. It is about 5.6 gal/min at a 70°F rise.
Flow limits
- The estimate excludes the flow needed to turn the heater on, heat lost in pipes, and installation.
- Cold water from a well or long pipe run can differ from the temperature you enter.
- Without a stated flow limit, estimates for warmer water may exceed the heater’s actual flow.
Product history
State ACTH-199M-(N,P) 1** was in the DOE listing by Oct 1, 2026.
State ACTH-199M-(N,P) 1** has a recorded ENERGY STAR market-availability date of Jun 16, 2026. It first appeared in the ENERGY STAR list between February 2026 and August 2026.
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| SCTH-199M-(N,P) 1** | 0.95 | 5.8 | 97% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
ENERGY STAR certified models
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency |
|---|---|---|---|
| SCTH-199M-(N,P) 1** | 0.95 | 5.8 | 97% |
It heats 5.8 gallons per minute of water by 67°F in the test. The median gas tankless model heats 4.8 gallons per minute by 67°F. Of 487 gas tankless models, 26 have a higher flow than this one.
Its single model number, SCTH-199M-(N,P) 1**, is ENERGY STAR certified. In tests, 95% of the energy went to hot water, so its UEF is 0.95. Its test simulated a day of high hot water use (its draw pattern). Its UEF is lower than that of 49 of the 399 gas tankless models with its draw pattern. A UEF of 0.93 is the median for its type and draw pattern. Of the energy it spends heating water, 97% ends up in it (its recovery efficiency).
All of its test figures are shared by 3 other basic models. The A. O. Smith, American, and Lochinvar brands list one or more of them. For the full group, see the A. O. Smith ACTH-199M-(N,P) 1** page.
In 7 states, 6 rebate programs may accept it. Another 2 rebate programs may accept it if it meets their other terms.
Also listed as
They carry every figure in the table above.
Rebates
| Program | State | Status | Program page |
|---|---|---|---|
| SoCalGas High-Efficiency or ENERGY STAR Certified Natural Gas Tankless Water Heaters rebate | CA | May qualify | Its own page |
| Colorado Springs Utilities Water heater rebate (gas storage, gas tankless) | CO | May qualify | Its own page |
| Nicor Gas Energy Efficiency Rebates for Your Home (gas tankless) | IL | May qualify if it meets the other terms | Its own page |
| DTE Energy Water Heaters (gas storage, gas tankless) | MI | May qualify | Its own page |
| Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless) | MN | May qualify | Its own page |
| PSE&G Tankless Water Heaters | NJ | May qualify | Its own page |
| Energy Trust of Oregon Residential Incentives | OR, WA | May qualify | Its own page |
| Focus on Energy (gas tankless) | WI | May qualify if it meets the other terms | Its own page |
Programs change their terms. Check the program's own page before you buy.
- Every State basic model
- Every gas tankless water heater certified at 5.0 to 5.9 gallons per minute
- Every gas tankless water heater
- The most-searched gas tankless models side by side
Not covered
- Advertised figures. We have none on file for this model.