DoesTheMath

EEMAX SPEX3512 vs KWICKSHOT TEF030V277: which uses less energy?

At the very small draw pattern the KWICKSHOT TEF030V277 uses 622 kWh a year and the EEMAX SPEX3512 628 — 7 kWh (1%) less, about 66 kWh over ten years. Both are filed as an electric tankless unit, 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 tankless unit at the very small draw pattern.

Filed and computed figures
EEMAX SPEX3512 KWICKSHOT TEF030V277
UEF (Uniform Energy Factor) 0.94 0.95 (better)
Energy use per year (kWh) 628 622 (better)
Max flow (GPM) 0.3 0.3
Installed cost range $1,300–$1,790 $1,303–$1,814
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

EEMAX SPEX3512: 628 kWh a year KWICKSHOT TEF030V277: 622 kWh a year

EEMAX SPEX3512 — 628 kWh a year KWICKSHOT TEF030V277 — 622 kWh a year

KWICKSHOT TEF030V277 is 6 kWh a year lower than EEMAX SPEX3512.

DOE CCD · 2026-09-19

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Enter your ZIP to price both units on the same rate where you live.

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 KWICKSHOT TEF030V277 if running cost matters most: it uses 7 kWh less a year on the same test.
  • Pick the EEMAX SPEX3512 if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the KWICKSHOT TEF030V277.
  • Neither if you need more than 0.3 GPM at the same time — neither unit lists more. Check how to size a tankless unit by GPM.

Each model on its own

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