HTP Phoenix 80-Gallon (PH100-80) is a gas storage water heater from HTP with a 75 gallon rated tank and a 132 gallon first-hour rating at a 0.93 UEF — 182 therms/yr certified use, 100k BTU/h input.
Our take
No certified gas storage water heater beats this one on efficiency: 0.93 UEF, three points clear of the 80-gallon class median, with 99% recovery efficiency to match — both catalog bests. That buys the lowest running cost of any gas tank here, roughly $264 a year on natural gas. First-hour delivery is the concession: 132 gallons, well under the 188.5-gallon cohort median, so it leans on its 75-gallon buffer rather than burner sprint. It is also tall at 72 inches, though a trim 23 inches across. Propane certified; sold under the HTP badge alone.
Best for: Lowest gas fuel bill available in a storage heater.
Trade-off: Below-median first-hour output and a 72-inch height requirement.
Efficiency
Uniform Energy Factor (UEF)
0.93
Annual gas use (natural gas)
182 therms/yr
Recovery efficiency
99 %
Annual propane use
198.9 gal/yr
General
Fuel
Natural Gas, Propane
Capacity
First-hour rating
132 gal
Rated storage volume
75 gal
Draw pattern
High
Performance
Gas input rate
100 kBTU/h
Installation
Max current draw
1 A
Vent type
Power Direct Vent
Vent size
3
Smart features
Smart / connected capable
No
Dimensions
Height
72 in
Diameter
23 in
Certification
ENERGY STAR certified
Yes
Capacity and running cost
Its 132 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 $264/year at national
average gas rates.
Is the HTP Phoenix 80-Gallon (PH100-80) ENERGY STAR certified?
Yes, the HTP Phoenix 80-Gallon (PH100-80) holds a current ENERGY STAR certification for water heating efficiency (UEF 0.93).
How much does the HTP Phoenix 80-Gallon (PH100-80) cost to run per year?
About $264 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 HTP Phoenix 80-Gallon (PH100-80) use?
The HTP Phoenix 80-Gallon (PH100-80) uses Power Direct Vent venting with 3 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the HTP Phoenix 80-Gallon (PH100-80) a smart water heater?
No, the HTP Phoenix 80-Gallon (PH100-80) is not connected-capable — it has no app connectivity or demand-response support.
