Verdict
Head-to-head · Best Tankless Water Heaters

Rinnai V75iN Gas Tankless vs Stiebel Eltron Tempra 36 Plus

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Stiebel Eltron Tempra 36 Plus comes out ahead by a narrow margin (4.7 vs 4.8). The gap is mostly about whole-home electric tankless installs in mild climates — read the strengths below before deciding.

Rinnai V75iN Gas Tankless
Ranked #4 in Best Tankless Water Heaters
Rinnai V75iN Gas Tankless
$1,100

The V75iN is the gas tankless pick — Rinnai's whole-home unit for households with natural gas service.

Strengths
  • Natural gas — better for cold climates than electric
  • 7.5 GPM at 35°F rise
  • Wi-Fi via Rinnai Control-R
Watch-outs
  • Requires gas line + venting
  • Most expensive pick
  • Annual descaling needed
Stiebel Eltron Tempra 36 Plus
Higher ratedRanked #1 in Best Tankless Water Heaters
Stiebel Eltron Tempra 36 Plus
$812

The Tempra 36 Plus is the best-overall pick — Stiebel Eltron's flow control handles whole-home demand without cold-water sandwiching.

Strengths
  • Advanced Flow Control prevents cold-water sandwiching
  • 36 kW max — handles whole-home demand in mild climates
  • 10-year combined warranty
Watch-outs
  • Requires 200A electrical service for full output
  • No Wi-Fi
  • Plumbing install required

How they stack up

Rinnai V75iN Gas Tankless

Only gas pick. Highest flow at cold inlet. Wi-Fi.

Stiebel Eltron Tempra 36 Plus

Best whole-home pick. German engineering. Highest amperage required.

Specs side-by-side

SpecRinnai V75iN Gas TanklessStiebel Eltron Tempra 36 Plus
TypeNatural gasElectric whole-home
Max GPM7.5
Wi-FiControl-R
InstallIndoor or outdoor
Power36 kW
Flow ControlAdvanced
Warranty10-year combined
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