Rinnai vs Noritz: Two Gas Tankless Specialists
Both Rinnai and Noritz publish gas tankless water heaters as their core US residential product, with neither company publishing a standard tank line. The comparison comes down to published warranty terms, model lineup breadth, and installer familiarity rather than product category differences.
Updated August 2026
Who wins what
Homeowners who want more published model options, including a hybrid tank-tankless unit.
Basis: Rinnai publishes a broader tankless model range and a hybrid tank-tankless product; Noritz's published catalog is gas tankless models only.
Homeowners who want a manufacturer whose entire published catalog is tankless with no other product category.
Basis: Noritz publishes gas tankless water heaters exclusively in the US, with no tank or combination product line.
Everyone, since neither publishes installed pricing.
Basis: Neither manufacturer publishes a combined equipment-plus-labor installed price.
Key differences at a glance
Core product focus
Rinnai- Rinnai
- Primarily gas tankless, with a hybrid tank-tankless product
- Noritz
- Gas tankless water heaters exclusively; no published US tank or combination line
Tankless heat exchanger warranty
Even- Rinnai
- Published 12-year heat exchanger, 5-year parts, 1-year labor on residential tankless models
- Noritz
- Published 12-year heat exchanger, 5-year parts on residential condensing tankless models
Published US tankless history
Rinnai- Rinnai
- Longer continuous published US tankless track record
- Noritz
- Shorter published US tankless track record than Rinnai
Distribution
Rinnai- Rinnai
- Wholesale, contractor, and growing retail presence
- Noritz
- Wholesale and contractor, with more limited retail presence than Rinnai
Full scorecard
| Metric | Rinnai | Noritz | Edge |
|---|---|---|---|
| Tank warrantyRow excluded from direct comparison since neither brand publishes a standard tank line | Not applicable; Rinnai's mainstream published lineup is tankless | Not applicable; Noritz does not publish a US tank line | Even |
| Parts warrantyManufacturer limited warranty documentation | 5 years on Rinnai's residential tankless models | 5 years on Noritz's residential tankless models | Even |
| First-hour rating or flow rateManufacturer spec sheets | Flow rate (GPM) published by model and groundwater temperature | Flow rate (GPM) published by model and groundwater temperature | Even |
| Fuel typeManufacturer product catalogs | Gas only | Gas only | Even |
Which one is right for you?
Choose Rinnai if…
- You want Rinnai's longer published continuous US tankless track record over Noritz's narrower, tankless-only entry into the category.
- You want the option of a hybrid tank-tankless unit, which Rinnai publishes and Noritz does not.
- You want more retail price visibility in addition to a contractor quote.
Choose Noritz if…
- Your contractor is a certified Noritz installer with established local parts access.
- You have already confirmed comparable published warranty terms between the two brands and installer familiarity is the deciding factor.
- You want a manufacturer whose entire published catalog is tankless, with no other product line diluting its published engineering focus.
Choose neither if…
- Your gas line and venting have not yet been sized by a licensed contractor for either Rinnai's or Noritz's condensing tankless unit.
- Your current tank still works and is under warranty for a minor, cheaply repaired issue, so neither a Rinnai nor a Noritz tankless switch is justified yet.
- You have not compared written quotes for Rinnai and Noritz from the same local installer before assuming either brand's price.
The short answer
Rinnai and Noritz are both gas tankless specialists with no published US tank line. Rinnai publishes a longer track record and a broader model range, including a hybrid unit. Noritz's published catalog is narrower and tankless-only. On comparable condensing tankless models, published warranty terms are close. Neither brand publishes installed pricing or independent reliability data.
Cost breakdown
| Line item | Rinnai | Noritz |
|---|---|---|
| Condensing tankless unit, mid-capacity residential | Not published by the manufacturer; some retail listings exist | Not published by the manufacturer |
| Venting and gas line modification | Set by the contractor; often required for tankless conversions | Set by the contractor; often required for tankless conversions |
| Installation labor | Set by the installer | Set by the installer |
| Permits | Set by your jurisdiction | Set by your jurisdiction |
Neither brand publishes installed pricing. A tankless conversion from a tank often requires gas line upsizing or new venting, which a licensed contractor should price as a separate line item from the unit itself.
Decision framework
Rinnai publishes a longer continuous US tankless product history than Noritz.
Rinnai publishes a hybrid tank-tankless product; Noritz's published catalog is tankless only.
Between Rinnai and Noritz, both tankless specialists, parts access depends on which brand your installer is set up to service.
Rinnai has a somewhat broader retail presence than Noritz's published distribution.
- Assuming either brand sells a mainstream tank water heater in the US; both publish tankless-focused catalogs.
- Comparing an entry-tier model from one brand against a mid-tier model from the other and calling the warranty gap a brand-wide difference.
- Assuming Rinnai's or Noritz's tankless unit will fit your current mechanical space without a licensed contractor checking gas line and venting first.
- Assuming a retail-listed Rinnai price includes venting, gas line work, and disposal of the old tank.
- Not confirming that a licensed plumber, rather than a general handyman, handles the gas line and venting work on a Rinnai or Noritz tankless conversion.
Tools and next steps
Frequently compared next
Frequently asked questions
Do Rinnai or Noritz make tank water heaters?
No. Both brands' published US catalogs are gas tankless water heaters; neither publishes a standard tank-only product line.
Which brand has been selling tankless water heaters longer in the US?
Rinnai publishes a longer continuous US tankless product history than Noritz.
Which brand has the longer tankless warranty?
Rinnai and Noritz both commonly publish a 12-year heat exchanger and 5-year parts tier on comparable residential condensing tankless models. Rinnai additionally publishes a 1-year labor term on its residential tankless line; confirm whether Noritz's quoted model includes a comparable labor term.
Is one brand more reliable than the other?
We found no independent public dataset ranking Rinnai against Noritz for reliability or repair frequency, so we do not publish a ranking.
Does Rinnai offer anything Noritz does not?
Rinnai publishes a hybrid tank-tankless product and a somewhat broader tankless model range and retail presence; Noritz's published catalog is narrower and tankless-only.
Is gas line or venting work involved in either installation safe to do myself?
No. Both Rinnai and Noritz publish tankless installation manuals that assume a licensed plumbing or gas contractor sizes the gas line, sets the venting, and inspects the combustion air path before startup.
Verify these details yourself
- Installed price for either brand in your local market.
- Whether your local contractor stocks both brands or only one.
- Real-world reliability or failure rates; no independent dataset was found.
- Exact warranty terms for the specific model line quoted, which vary within each brand's catalog.
- Whether your existing gas line and venting can support a tankless conversion without upsizing.
Methodology and sources
Specifications, pricing, warranties, and availability may change. We verify key details against official or reputable public sources and note where information is estimated or not publicly disclosed. HomeownerAnswers does not perform product testing.
- Rinnai residential tankless warranty documentation - Official manufacturer, checked 2026-08-03, confidence: high
- Noritz residential tankless warranty documentation - Official manufacturer, checked 2026-08-03, confidence: high
- ENERGY STAR water heater criteria - Government, checked 2026-08-03, confidence: high
- Department of Energy water heater efficiency guidance - Government, checked 2026-08-03, confidence: high
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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.