Head-to-head · Best Tankless Water Heaters

EcoSmart ECO 27 vs Rinnai V75iN Gas Tankless

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

Rinnai V75iN Gas Tankless comes out ahead by a narrow margin (4.6 vs 4.7). The gap is mostly about northern homes with natural gas service — read the strengths below before deciding.

Ranked #3 in Best Tankless Water Heaters

EcoSmart ECO 27

4.6

$540

The ECO 27 is the high-flow pick — EcoSmart's best GPM-to-price ratio for households with multiple simultaneous hot-water demands.

Strengths

— 6.6 GPM max — highest in this lineup
— Compact unit saves install space
— 0.3 GPM minimum activation

Watch-outs

— Requires 240V triple-pole breaker
— Some undersizing complaints below 40°F inlet
— Customer support response variable

$540 · Check Price on Amazon Full review →

Higher ratedRanked #4 in Best Tankless Water Heaters

Rinnai V75iN Gas Tankless

4.7

$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

$1,100 · Check Price on Amazon Full review →

How they stack up

EcoSmart ECO 27

Highest GPM. Lifetime element warranty. Undersizes in deep cold.

Rinnai V75iN Gas Tankless

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

Specs side-by-side

Spec	EcoSmart ECO 27	Rinnai V75iN Gas Tankless
Type	Electric whole-home	Natural gas
Power	27 kW	—
Max GPM	6.6	7.5
Warranty	Lifetime elements	—
Wi-Fi	—	Control-R
Install	—	Indoor or outdoor

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