Noritz EZ111DV
Amazon customer rating as of
Tankless Geek editorial score: 4.7/5
The Noritz EZ111DV (EZ Series PRO) is a high-capacity condensing gas tankless engineered for easy replacement of a large tank: 199,900 BTU/h, up to 11.1 GPM, and an exceptional 0.98 UEF, with top-mounted water connections that let an installer reuse existing plumbing. It pairs dual stainless-steel heat exchangers with inverter-style burner modulation and a Steady BTU Mode for consistent temperature, is ENERGY STAR certified, installs indoor or outdoor, and direct-vents with 2- or 3-inch PVC/CPVC up to 65 feet. Its standout is the warranty: 25 years on the heat exchanger — among the longest in the industry.
This is genuine whole-home, cold-climate capacity — roughly 11 GPM in warm conditions and still about 5.6 GPM at a hard 70 °F winter rise, comfortably running several fixtures at once. As a condensing unit it needs a condensate drain and appropriate venting, and at 199,900 BTU it wants proper gas sizing and a professional install. For a homeowner replacing a big tank who wants maximum efficiency, top-connection convenience, and the reassurance of a 25-year heat-exchanger warranty, the EZ111DV is a compelling flagship.
Key Features
Best Use Cases
Our Verdict
A flagship condensing tankless built for painless big-tank replacement — top connections, 11.1 GPM, a class-leading 0.98 UEF, and a remarkable 25-year heat-exchanger warranty. Cold-climate whole-home capacity with the longest exchanger coverage around. The trade-off is a premium price and a proper condensing install.
Technical Specifications
| Input | Up to 199,900 BTU/h (natural gas) |
|---|---|
| Max flow | Up to 11.1 GPM (at a 30 °F rise) |
| Efficiency | 0.98 UEF, condensing; ENERGY STAR |
| Heat exchangers | Dual stainless + inverter burner; Steady BTU Mode |
| Install | Top connections; 2"/3" PVC to 65 ft; indoor/outdoor |
| Dimensions | 27.0 × 18.5 × 12.8 in (H×W×D), ≈81 lb |
Specifications verified against the linked source documents. See Sources below.
How much hot water you'll actually get
Usable flow drops as incoming water gets colder. Figures are calculated from rated output (199,900 BTU × 0.98 UEF) and labeled as such — not bench-tested by us.
| Temperature rise | Typical scenario | Usable flow |
|---|---|---|
| 35 °F | Warm climate (75 °F in → 110 °F) — capped at max | 11.1 GPM |
| 45 °F | Mild climate (65 °F in → 110 °F) | 8.7 GPM |
| 60 °F | Cool climate (50 °F in → 110 °F) | 6.5 GPM |
| 70 °F | Cold climate (40 °F in → 110 °F) | 5.6 GPM |
Usable flow at a 110 °F target: BTU × UEF ÷ (ΔF × 500), capped at the 11.1 GPM maximum (condensing, 0.98 UEF). Noritz rates 11.1 GPM at a 30 °F rise.
Pros
Cons
Buy it if…
- Homeowners replacing a large tank (top connections reuse plumbing)
- Large or cold-climate homes needing high simultaneous flow
- Efficiency-maximizers (0.98 UEF, ENERGY STAR)
- Buyers who value the longest heat-exchanger warranty available
Skip it if…
- Small homes that won't use 199,900 BTU
- Budget buyers avoiding a premium condensing install
- Installs where a simpler non-condensing unit suffices
Installation Requirements
Professional vs DIY
Designed for easier retrofit with top connections, but the gas, venting, and condensate work still require a licensed installer.
Gas and electrical work should be done by a licensed professional, and most installs require a permit and must meet local building codes — DIY work can void the manufacturer warranty. Always confirm the unit's own manual for exact clearances, venting, and sizing.
What owners report
Themes summarized from retailer customer feedback (4.2/5 Amazon customer rating, 35 ratings, as of 2026-09-06). These are owner opinions, not our own bench testing.
The top water connections are repeatedly praised for letting installers reuse existing lines, speeding the swap from a tank.
Owners credit the 0.98 UEF and Steady BTU Mode for low gas bills and consistent temperature under load.
The 25-year heat-exchanger warranty stands out to buyers as strong long-term peace of mind.
As a 199,900 BTU condensing unit it needs a condensate drain, PVC venting, and proper gas sizing.
Noritz EZ111DV FAQ
Why is it easier to install as a replacement?+
Its water connections are on top, so an installer can reuse the existing plumbing from a tank rather than re-routing lines — a real time-saver on retrofits.
How long is the warranty?+
25 years on the heat exchanger plus 5 years on parts — among the longest heat-exchanger warranties in the industry.
Will it handle a cold climate?+
Yes — it delivers about 5.6 GPM even at a hard 70 °F winter rise, keeping several fixtures running in cold weather.
What venting does it use?+
As a condensing unit it direct-vents with 2- or 3-inch PVC/CPVC up to 65 feet and requires a condensate drain.
What gas supply does the EZ111DV require?+
At up to 199,900 BTU/h it's a high-input unit, so both the gas line and the meter matter. Most installs use a 3/4-inch gas line, but a long run from the meter often needs upsizing to 1 inch to deliver full input without a pressure drop, and the meter itself must have capacity to spare once your furnace, range, and dryer are counted. Have the installer verify both the line size and the meter's total load — starving a 199,900 BTU burner is a common cause of a new tankless underperforming or throwing error codes.
Product sources
Specifications verified 2026-09-06. Manufacturer documents are treated as the primary source for model specifications. Retailer pages are used only for customer ratings and owner-feedback themes.
- Noritz EZ111DV (EZ Series PRO) — official page (accessed 2026-09-06)
- EZ111DV specs (0.98 UEF, 25-yr) — HVACDirect (accessed 2026-09-06)
- Noritz EZ111DV — ENERGY STAR listing (accessed 2026-09-06)
Price range from leading retailers
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