The Vaughn Thermal MPxxFHPT line holds three certified rating sets of 240 V integrated heat-pump water heaters, 3 model numbers sold as Vaughn Thermal, listed by Vaughn Thermal. Rated volume runs from 55 to 119 gal, and the first-hour rating runs from 62 to 115 gal. UEFs compare only within a draw pattern; the two high-draw sets rate UEF 3.50. Vaughn Thermal MP120FHPT lists 119 gal of rated volume, the second highest of the 101 heat-pump sets (shared by three sets). Vaughn Thermal MP120FHPT lists 115 gal in the first hour, the fourth highest of the 101 heat-pump sets.
UEF ranks compare sets of the same draw pattern only.
Vaughn Thermal MPxxFHPT: first-hour rating against rated volume
Vaughn Thermal MPxxFHPTOther heat-pump sets
First-hour rating, gal
Filled: the three sets of Vaughn Thermal MPxxFHPT; open circles: the other 98 heat-pump sets. Dashed lines mark 1× and 1.5× the rated volume; the highest ratio in the line is 1.13×, on Vaughn Thermal MP55FHPT.
Across the sizes
From Vaughn Thermal MP55FHPT to Vaughn Thermal MP120FHPT, rated volume grows by 64 gal and the first-hour rating by 53 gal: 0.83 gal of first-hour output for each added rated gallon.
The sizes test at different draw patterns (two high and one medium), so UEF and annual energy compare only between sizes that share a pattern (why).
Strongest placings, size by size
Measure
Value
Median of the group
Placing
Compared with
Rated electricity useVaughn Thermal MP55FHPT
982 kWh/yr
894 kWh/yr
sixth highest of 38
38 medium-draw heat-pump sets
UEFVaughn Thermal MP55FHPT
3.30
3.56
seventh lowest of 38
38 medium-draw heat-pump sets
First-hour output per rated gallonVaughn Thermal MP80FHPT
1.07
1.25
11th lowest of 101, two tied
101 heat-pump sets
UEFVaughn Thermal MP80FHPT
3.50
3.88
12th lowest of 58, five tied
58 high-draw heat-pump sets
Rated volumeVaughn Thermal MP120FHPT
119 gal
61 gal
second highest of 101, three tied
101 heat-pump sets
First-hour ratingVaughn Thermal MP120FHPT
115 gal
77 gal
fourth highest of 101
101 heat-pump sets
Model numbers
The line covers 3 model numbers, all certified 2025-12-12.