DoesTheMath

KWICKSHOT TEF024V120 vs Rheem SPEX1812T: which uses less energy?

At the very small draw pattern the Rheem SPEX1812T uses 615 kWh a year and the KWICKSHOT TEF024V120 622 — 6 kWh (1%) less, about 65 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
KWICKSHOT TEF024V120 Rheem SPEX1812T
UEF (Uniform Energy Factor) 0.95 0.96 (better)
Energy use per year (kWh) 622 615 (better)
Max flow (GPM) 0.2 0.2
Installed cost range $1,303–$1,814 $1,306–$1,838
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

KWICKSHOT TEF024V120: 622 kWh a year Rheem SPEX1812T: 615 kWh a year

KWICKSHOT TEF024V120 — 622 kWh a year Rheem SPEX1812T — 615 kWh a year

Rheem SPEX1812T is 7 kWh a year lower than KWICKSHOT TEF024V120.

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 Rheem SPEX1812T if running cost matters most: it uses 6 kWh less a year on the same test.
  • Pick the KWICKSHOT TEF024V120 if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the Rheem SPEX1812T.
  • Neither if you need more than 0.2 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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