A. O. Smith GT15TM-160X3-P 1-1 is a gas tankless water heater from A. O. Smith rated 4.8 GPM at a 0.95 UEF — 178 therms/yr certified use, 160k BTU/h input.
Also sold as the A. O. Smith ATM-160M-P 1-1. This model is the same certified
hardware as the A. O. Smith ATM-160M-P 1-1, published under a
different brand — full details, comparisons, and pricing live on that page. The
certified figures below are identical.
Efficiency
Uniform Energy Factor (UEF)
0.95
Annual gas use (natural gas)
178 therms/yr
Recovery efficiency
96 %
Annual propane use
194.53 gal/yr
General
Fuel
Propane
Capacity
Max flow rate
4.8 GPM
Draw pattern
High
Minimum activation flow
1 GPM
Performance
Gas input rate
160 kBTU/h
Installation
Max current draw
5 A
Vent type
Power Direct Vent, Power Vent
Vent size
3 / 2
Smart features
Smart / connected capable
No
Dimensions
Width
17.3 in
Depth
12 in
Certification
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 A. O. Smith GT15TM-160X3-P 1-1 at common temperature
rises (a typical shower uses about 2 GPM of mixed water):
Is the A. O. Smith GT15TM-160X3-P 1-1 ENERGY STAR certified?
Yes, the A. O. Smith GT15TM-160X3-P 1-1 holds a current ENERGY STAR certification for water heating efficiency (UEF 0.95).
How much does the A. O. Smith GT15TM-160X3-P 1-1 cost to run per year?
About $525 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 A. O. Smith GT15TM-160X3-P 1-1 use?
The A. O. Smith GT15TM-160X3-P 1-1 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 A. O. Smith GT15TM-160X3-P 1-1 a smart water heater?
No, the A. O. Smith GT15TM-160X3-P 1-1 is not connected-capable — it has no app connectivity or demand-response support.
