DoesTheMath

Stiebel Eltron Accelera 300 E vs VAUGHN THERMAL MP55FHPT: which uses less energy?

At the medium draw pattern the VAUGHN THERMAL MP55FHPT uses 984 kWh a year and the Stiebel Eltron Accelera 300 E 1,025 — 40 kWh (4%) less, about 404 kWh over ten years. Both are filed as an electric tank, so the comparison holds. Enter your ZIP below to price the difference.

Side by side

Compared within one class only: models filed as an electric tank at the medium draw pattern.

Filed and computed figures
Stiebel Eltron Accelera 300 E VAUGHN THERMAL MP55FHPT
UEF (Uniform Energy Factor) 3.17 3.3 (better)
Energy use per year (kWh) 1,025 984 (better)
First hour rating (gal) 66 62
Rated storage volume (gal) 58 55
Installed cost range $3,379–$3,943 $3,297–$4,045
ENERGY STAR certified not matched yes
Sound level (dB) not filed 54
Refrigerant not filed R-134a, GWP 1430
On the market since not filed 2025-06-01
DOE CCD · 2026-09-19

What it costs to run

Stiebel Eltron Accelera 300 E: 1,025 kWh a year VAUGHN THERMAL MP55FHPT: 984 kWh a year

Stiebel Eltron Accelera 300 E — 1,025 kWh a year VAUGHN THERMAL MP55FHPT — 984 kWh a year

VAUGHN THERMAL MP55FHPT is 41 kWh a year lower than Stiebel Eltron Accelera 300 E.

DOE CCD · 2026-09-19

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Reliability

Not published: Reliability, failure rates and each model’s actual warranty term.

The registries these figures come from certify energy performance under a federal test; none of them records how long a unit lasts or how often it fails, so this page does not rank the two on reliability.

What is here instead:

  • The filed efficiency, capacity and tank size of both models, side by side below.
  • The actual warranty term is printed in each model’s documentation, not in any registry.

Which should you pick?

  • Pick the VAUGHN THERMAL MP55FHPT if running cost matters most: it uses 40 kWh less a year on the same test.
  • Pick the Stiebel Eltron Accelera 300 E if you need more hot water in your busiest hour: it lists a first hour rating of 66 gallons against 62.
  • Neither if your household's busiest hour needs more than 66 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

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