American GSP-100 2 30-Gallon is a gas storage water heater from American with a 33 gallon rated tank and a 170 gallon first-hour rating at a 0.9 UEF — 188 therms/yr certified use, 100k BTU/h input.
Also sold as the A. O. Smith SWN100035 2 30-Gallon. This model is the same certified
hardware as the A. O. Smith SWN100035 2 30-Gallon, 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)
0.9
Annual gas use (natural gas)
188 therms/yr
Recovery efficiency
95 %
Annual propane use
205.46 gal/yr
General
Fuel
Natural Gas, Propane
Capacity
First-hour rating
170 gal
Rated storage volume
33 gal
Draw pattern
High
Performance
Gas input rate
100 kBTU/h
Installation
Max current draw
5 A
Vent type
Power Direct Vent
Vent size
2
Smart features
Smart / connected capable
No
Dimensions
Height
49 in
Diameter
22 in
Certification
ENERGY STAR certified
Yes
Capacity and running cost
Its 170 gallon first-hour rating suits a
household of 5+ people under DOE sizing guidance.
Rated for a high-usage draw pattern
under the DOE test procedure.
Estimated running cost: about $273/year at national
average gas rates.
Is the American GSP-100 2 30-Gallon ENERGY STAR certified?
Yes, the American GSP-100 2 30-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 0.9).
How much does the American GSP-100 2 30-Gallon cost to run per year?
About $273 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 GSP-100 2 30-Gallon use?
The American GSP-100 2 30-Gallon uses Power Direct Vent venting with 2 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the American GSP-100 2 30-Gallon a smart water heater?
No, the American GSP-100 2 30-Gallon is not connected-capable — it has no app connectivity or demand-response support.
