DoesTheMath

RINNAI REHP65W* vs Senville SENWH-HP65US: which uses less energy?

At the high draw pattern the RINNAI REHP65W* uses 1,240 kWh a year and the Senville SENWH-HP65US 1,272 — 32 kWh (3%) less, about 318 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 high draw pattern.

Filed and computed figures
RINNAI REHP65W* Senville SENWH-HP65US
UEF (Uniform Energy Factor) 4 (better) 3.9
Energy use per year (kWh) 1,240 (better) 1,272
First hour rating (gal) 80 80
Rated storage volume (gal) 61 60
Installed cost range $3,572–$4,801 $3,528–$4,692
ENERGY STAR certified yes yes
Sound level (dB) 49 49
Refrigerant R-134a, GWP 1430 R-134a, GWP 1430
On the market since 2026-06-30 2025-11-01
DOE CCD · 2026-09-19

What it costs to run

RINNAI REHP65W*: 1,240 kWh a year Senville SENWH-HP65US: 1,272 kWh a year

RINNAI REHP65W* — 1,240 kWh a year Senville SENWH-HP65US — 1,272 kWh a year

RINNAI REHP65W* is 32 kWh a year lower than Senville SENWH-HP65US.

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.
  • Both are ENERGY STAR certified, which requires a manufacturer warranty of at least six years; the actual term for each model is not published.
  • Time on the market, as filed with ENERGY STAR: the RINNAI REHP65W* since 2026-06-30, the Senville SENWH-HP65US since 2025-11-01. A sale date, not a lifespan.

Which should you pick?

  • Pick the RINNAI REHP65W* if running cost matters most: it uses 32 kWh less a year on the same test.
  • Pick the Senville SENWH-HP65US if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the RINNAI REHP65W*.
  • Neither if your household's busiest hour needs more than 80 gallons of hot water — neither lists more. Check whether a 65-gallon heater is enough.

Each model on its own

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