A. O. Smith HDHE-50 4 50-Gallon is a gas storage water heater from A. O. Smith with a 49 gallon rated tank and a 118 gallon first-hour rating at a 0.88 UEF — 192 therms/yr certified use, 100k BTU/h input.
Efficiency
Uniform Energy Factor (UEF)
0.88
Annual gas use (natural gas)
192 therms/yr
Recovery efficiency
97 %
Annual propane use
209.83 gal/yr
General
Fuel
Natural Gas, Propane
Capacity
First-hour rating
118 gal
Rated storage volume
49 gal
Draw pattern
High
Performance
Gas input rate
100 kBTU/h
Installation
Max current draw
5 A
Vent type
Power Vent
Vent size
2 / 3
Smart features
Smart / connected capable
No
Dimensions
Height
55.7 in
Diameter
18 in
Certification
ENERGY STAR certified
Yes
Capacity and running cost
Its 118 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 $278/year at national
average gas rates.
Also sold as
The A. O. Smith HDHE-50 4 50-Gallon is certified hardware that A. O. Smith and its partner brands
publish under 5 names. The same specifications apply to every
variant:
Is the A. O. Smith HDHE-50 4 50-Gallon ENERGY STAR certified?
Yes, the A. O. Smith HDHE-50 4 50-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 0.88).
How much does the A. O. Smith HDHE-50 4 50-Gallon cost to run per year?
About $278 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 HDHE-50 4 50-Gallon use?
The A. O. Smith HDHE-50 4 50-Gallon uses Power Vent venting with 2 / 3 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the A. O. Smith HDHE-50 4 50-Gallon a smart water heater?
No, the A. O. Smith HDHE-50 4 50-Gallon is not connected-capable — it has no app connectivity or demand-response support.
