American MCTH-199M-(N,P) 1
American MCTH-199M-(N,P) 1 is a gas tankless water heater from American rated 5.8 GPM at a 0.95 UEF.
| Uniform Energy Factor (UEF) | 0.95 |
|---|---|
| Annual gas use (natural gas) | 178 therms/yr |
| Recovery efficiency | 97 % |
| Annual propane use | 194.53 gal/yr |
| Fuel | Natural Gas, Propane |
|---|
| Max flow rate | 5.8 GPM |
|---|---|
| Draw pattern | High |
| Minimum activation flow | 1 GPM |
| Gas input rate | 199 kBTU/h |
|---|
| Max current draw | 5 A |
|---|---|
| Vent type | Power Direct Vent, Power Vent |
| Vent size | 3 / 2 |
| Smart / connected capable | No |
|---|
| Width | 17 in |
|---|---|
| Depth | 16 in |
| ENERGY STAR certified | Yes |
|---|
Real flow rate by climate
A tankless heater's usable flow depends on how far it must raise incoming water temperature. Sustained hot-water flow of the American MCTH-199M-(N,P) 1 at common temperature rises (a typical shower uses about 2 GPM of mixed water):
| Temperature rise | Climate | Sustained flow | Simultaneous showers |
|---|---|---|---|
| 45 °F | Warm climate (~75 °F groundwater) | 5.8 GPM | 2 |
| 55 °F | Mild climate (~65 °F groundwater) | 5.8 GPM | 2 |
| 70 °F | Cold climate (~50 °F groundwater) | 5.4 GPM | 2 |
| 77 °F | DOE test condition | 4.9 GPM | 2 |
Similar water heaters
- A. O. Smith ACTH-199M-(N,P) 1 (UEF 0.95)
- A. O. Smith T-H3-OS-N 1 (ACT-199O-N 1) (UEF 0.95)
- A. O. Smith T-H3-OS-N 1 (ACT-199O-P 1-1) (UEF 0.95)
- A. O. Smith T-H3-OS-N 1 (ATO-540H 1) (UEF 0.95)
- A. O. Smith T-H3-OS-N 1 (ATO-540H 1-1) (UEF 0.95)
- A. O. Smith T-H3-OS-N 1 (ATO-540HX3-N 1) (UEF 0.95)
Frequently asked questions
Is the American MCTH-199M-(N,P) 1 ENERGY STAR certified?
Yes, the American MCTH-199M-(N,P) 1 holds a current ENERGY STAR certification for water heating efficiency (UEF 0.95).
How much does the American MCTH-199M-(N,P) 1 cost to run per year?
About $258 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What venting does the American MCTH-199M-(N,P) 1 use?
The American MCTH-199M-(N,P) 1 uses Power Direct Vent, Power Vent venting with 3 / 2 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the American MCTH-199M-(N,P) 1 a smart water heater?
No, the American MCTH-199M-(N,P) 1 is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)