Make a confident water heater decision

Endless hot water starts with the right fit for your home.

Pick your fuel, see the few heaters that fit, and compare flow, power and installation needs side by side.

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Already know what you need? Go straight to a comparison. No calculator or email required.

Compare the exact model See requirements and limitations up front Price links only when the listing is verified No paid placements
Step 2 · Short list

Heaters that fit most homes

Two gas and two electric picks from our full 8-model comparison. Affiliate disclosure: we may earn a commission on purchases through our links, at no extra cost to you. Learn more

Gas (natural gas)

Best overall gas

Rinnai RU199iN

  • Best fit: Larger homes running two showers and a dishwasher at once
  • Requires: Natural gas supply sized for 199,000 BTU and PVC condensing venting
  • Limitation: No built-in recirculation pump; Wi-Fi module sold separately
Check Current Price → See details
Rinnai RU199iN condensing tankless water heater
Steady temperature

Noritz EZ111-DV (NG)

  • Best fit: Gas homes that want steady temperature at low flow, or two linked units
  • Requires: Natural gas supply sized for 199,900 BTU and PVC condensing venting
  • Limitation: Service network is thinner than Rinnai’s, especially in rural areas
Check Current Price → See details
Product photo pending verification

Electric

Best whole-house electric

Stiebel Eltron Tempra 36 Plus

  • Best fit: Homes without gas service, in warm to moderate climates
  • Requires: 240V / 150A (two 60A double-pole breakers); typically a 200A panel
  • Limitation: About 7 GPM at a 50°F rise, so fewer simultaneous showers than gas in cold months
Check Current Price → See details
Product photo pending verification
Budget electric

EcoSmart ECO 27

  • Best fit: 1–2 bathroom homes in warm climates on a tight budget
  • Requires: 240V / 112.5A (three 40A double-pole breakers)
  • Limitation: Flow drops sharply when incoming water is cold; not for northern winters
Price link pending listing verification. See details
EcoSmart ECO 27 electric tankless water heater
Step 3 · Compare

The short list, side by side

Need more models? Compare all gas or all electric heaters.

ModelFuelRated flowInstall needsBest for
Rinnai RU199iNNatural gas, condensing11.1 GPM199K BTU gas line, PVC ventLarger homes, cold climates
Noritz EZ111-DVNatural gas, condensing11.1 GPM199.9K BTU gas line, PVC ventSteady temperature, linked units
Stiebel Eltron Tempra 36 PlusElectric~7 GPM at 50°F rise240V / 150A, no ventingWhole-house electric
EcoSmart ECO 27Electric3–6.5 GPM (climate-dependent)240V / 112.5A, no ventingWarm climates, budget
Step 4 · Next steps

Confirm size and installation

Use these when you want to double-check before you buy.

Sizing calculatorClimate, household size and fixtures turn into the GPM and BTU you need.Size my heater → Installation costsGas line, venting, electrical panel and labor, explained.See install costs → Gas vs. electricWhen gas makes sense, when electric wins, and what it costs to switch.Read the breakdown →
Learn more

Guides and how we compare

Is tankless worth it?

Upfront cost, lifespan and payback compared with a tank heater.

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How we compare

We compare manufacturer specification sheets, ENERGY STAR listings and warranty terms. We do not accept manufacturer payments or paid placements. A “Check Current Price” button appears only after we confirm the retailer listing matches the exact model; otherwise you will see a pending notice. Read our full methodology or about TanklessGeek.