Real ChatGPT answer + Gemini simulation · index seed9ZUrfWV640ccompleteAI OverviewHome services and improvement · plumbingcommercial
Are there any current firmware issues or recalls on Navien tankless water heaters I should know about before calling a local plumber?
ChatGPTgpt-6Geminigemini-3.5-flash-lite3 passes + 1 real-search38 queries10/30/2026
Download run
Gemini unique queries
35
1 in ≥ half the passes · stability 34%
ChatGPT real searches predicted
100%
3 of 3 matched the simulation
Fan-out diagram
Seed → topic clusters → sub-queries, per model.
SEED QUERY
Are there any current firmware issues or recalls on Navien tankless water heaters I should know about before calling a local plumber?
35 unique queries · 3 passes
control board failures and bulletins
1 query · 2 hits
navien technical service bulletin list2xGoogle ↗
REFORMULATION
Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.
Query classes
Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
ChatGPT real searches (3)
Classes come from the query-classifier (a local Laya model). 1 of 3 calls are low-confidence (under 50%) — hover a query in the table to see its confidence. 35 queries are still being classified.
What the models actually searched
Each model answered the query with its own web search. These are the searches it ran, matched to the closest simulated query.
ChatGPT3 real searches · gpt-6100% predicted
Navien tankless water heater recalls firmware software issues service bulletins 2026 Google ↗
CPSC Navien tankless water heater recall notices Google ↗
Navien tankless water heater control board firmware update error codes technical bulletin Google ↗
- Navien Recalls Tankless Water Heaters and Boilers Due to Risk of Carbon Monoxide Poisoning · cpsc.gov
- Navien Recalls Tankless Water Heaters Due to Risk of Carbon Monoxide Poisoning · cpsc.gov
- 5.2 Understanding Error Codes · navieninc.com
- What do Navien tankless error codes mean? · hqplumbingandair.com
- Navien Notices · navieninc.com
Semantic map
Every query placed by meaning (EmbeddingGemma 2, 256-d). Shaded regions are topics, nearby points are near-paraphrases, and a circle's size is how often the query came back.
Colour
SimulatedReal search
Hover a query to see its counterpart · click a topic to focus it · zoom with Ctrl/⌘ + scroll, a pinch, double-click or +
Queries
35 queries · click a column to sort
| Query / type | Search | Intent | Query class | Routing format | Cluster | Freq ↓ | Weight |
|---|---|---|---|---|---|---|---|
navien technical service bulletin list REFORMULATION | Google ↗ AI Mode ↗ | Access official manufacturer bulletins regarding hidden defects, updates, or service advisories. | — | product_spec_sheet | control board failures and bulletins | 2x of 3 | |
navien tankless water heater safety recalls official notices REFORMULATION | Google ↗ AI Mode ↗ | Find official government or manufacturer recall announcements for Navien tankless water heaters. | — | pdf_whitepaper | official safety recalls and cpsc notices | 1x of 3 | |
navien tankless water heater current recalls cpsc safety notice REFORMULATION | Google ↗ AI Mode ↗ | Find official safety notices and consumer product safety commission recalls for Navien units. | — | web_article | official safety recalls and cpsc notices | 1x of 3 | |
navien tankless water heater recalls current safety notices REFORMULATION | Google ↗ AI Mode ↗ | Find official government or manufacturer safety recall announcements for Navien tankless units. | — | press_release | official safety recalls and cpsc notices | 1x of 3 | |
navien tankless water heater error codes firmware bugs RELATED | Google ↗ AI Mode ↗ | Identify common software glitches, error codes, and firmware problems associated with Navien units. | — | product_spec_sheet | firmware updates and error codes | 1x of 3 | |
navien tankless water heater firmware update issues error codes RELATED | Google ↗ AI Mode ↗ | Identify known firmware bugs, software glitches, and associated error codes on Navien models. | — | faq_page | firmware updates and error codes | 1x of 3 | |
navien tankless water heater firmware update error codes RELATED | Google ↗ AI Mode ↗ | Identify common software errors and firmware problems reported by users. | — | faq_page | firmware updates and error codes | 1x of 3 | |
do tankless water heaters have firmware updates IMPLICIT | Google ↗ AI Mode ↗ | Understand how firmware works on modern tankless water heaters and whether updates are user-accessible. | — | faq_page | checking system software version | 1x of 3 | |
navien NPE series common problems and fixes ENTITY EXPANSION | Google ↗ AI Mode ↗ | Discover specific failure modes and known issues for Navien's popular NPE condensing water heater line. | — | forum/qna | common unit problems and fixes | 1x of 3 | |
how to check navien tankless water heater software version IMPLICIT | Google ↗ AI Mode ↗ | Learn the step-by-step method to check the current firmware version on the unit's control panel. | — | how_to_steps | checking system software version | 1x of 3 | |
navien vs rinnai tankless water heater reliability issues COMPARATIVE | Google ↗ AI Mode ↗ | Compare Navien's reliability and recall history with competing brands like Rinnai. | — | comparison_table | brand reliability comparison navien rin… | 1x of 3 | |
how to check navien water heater firmware version IMPLICIT | Google ↗ AI Mode ↗ | Learn the step-by-step procedure to check the current software version installed on a Navien unit. | — | how_to_steps | checking system software version | 1x of 3 | |
navien vs rinnai tankless water heater reliability and common problems COMPARATIVE | Google ↗ AI Mode ↗ | Compare Navien failure rates and recall history against competing brands like Rinnai. | — | comparison_table | brand reliability comparison navien rin… | 1x of 3 | |
navien NPE series gas condensing tankless water heater common problems ENTITY EXPANSION | Google ↗ AI Mode ↗ | Examine known hardware and software problems specific to Navien's most popular NPE series models. | — | review_roundup | common unit problems and fixes | 1x of 3 | |
navien vs rinnai tankless water heater reliability and issues COMPARATIVE | Google ↗ AI Mode ↗ | Compare the failure rates and common complaints of Navien tankless units against primary competitors like Rinnai. | — | comparison_table | brand reliability comparison navien rin… | 1x of 3 | |
navien npe-2 series common defects and control board failures ENTITY EXPANSION | Google ↗ AI Mode ↗ | Examine specific known flaws in Navien's most popular NPE-2 condensing tankless water heater models. | — | product_spec_sheet | control board failures and bulletins | 1x of 3 | |
questions to ask plumber before repairing tankless water heater PERSONALIZED | Google ↗ AI Mode ↗ | Prepare a list of targeted questions regarding recalls and firmware to ask when hiring a plumber. | — | checklist | hiring and consulting local plumbers | 1x of 3 | |
navien tankless water heater warranty claim process PERSONALIZED | Google ↗ AI Mode ↗ | Understand what parts and labor are covered under warranty if a recalled or defective part is found. | — | pdf_whitepaper | warranty claims and customer reviews | 1x of 3 | |
questions to ask plumber when servicing tankless water heater PERSONALIZED | Google ↗ AI Mode ↗ | Prepare a checklist of targeted technical questions to ask a local contractor before they arrive. | — | checklist | hiring and consulting local plumbers | 1x of 3 | |
cpsc safety recall search navien tankless REFORMULATION | Google ↗ AI Mode ↗ | Search the Consumer Product Safety Commission database specifically for Navien water heater recalls. | — | web_article | official safety recalls and cpsc notices | 1x of 3 | |
cpsc safety recall search navien water heater REFORMULATION | Google ↗ AI Mode ↗ | Check the Consumer Product Safety Commission database specifically for Navien water heaters. | — | dataset | official safety recalls and cpsc notices | 1x of 3 | |
signs your tankless water heater needs a professional plumber RELATED | Google ↗ AI Mode ↗ | Determine when a DIY fix is no longer viable and a certified plumber must be hired. | — | checklist | hiring and consulting local plumbers | 1x of 3 | |
navien tankless water heater ignition failure fix RELATED | Google ↗ AI Mode ↗ | Find common solutions for ignition failure issues that are often confused with firmware problems. | — | web_article | common unit problems and fixes | 1x of 3 | |
navien control board replacement firmware version RELATED | Google ↗ AI Mode ↗ | Find out if control board replacements are required to fix older Navien firmware issues. | — | forum/qna | control board failures and bulletins | 1x of 3 | |
navien ignition failure error code e003 e012 fix IMPLICIT | Google ↗ AI Mode ↗ | Troubleshoot specific common error codes that might feel like firmware failures but are actually sensor or gas issues. | — | faq_page | control board failures and bulletins | 1x of 3 | |
how to check firmware version on navien tankless water heater IMPLICIT | Google ↗ AI Mode ↗ | Learn the procedure for checking the currently installed software version on the front display panel. | — | how_to_steps | checking system software version | 1x of 3 | |
navien tankless water heater customer reviews reliability 2025 ENTITY EXPANSION | Google ↗ AI Mode ↗ | Read recent user feedback and long-term reliability reports on recent Navien models. | — | review_roundup | warranty claims and customer reviews | 1x of 3 | |
navien tankless water heater user complaints forum RELATED | Google ↗ AI Mode ↗ | Read real-world experiences from other homeowners encountering unexplained operational glitches. | — | forum/qna | warranty claims and customer reviews | 1x of 3 | |
navien tankless water heater class action lawsuit safety ENTITY EXPANSION | Google ↗ AI Mode ↗ | Check if there are any ongoing legal actions or major defect investigations involving Navien heaters. | — | press_release | official safety recalls and cpsc notices | 1x of 3 | |
navien control board replacement cost and symptoms COMPARATIVE | Google ↗ AI Mode ↗ | Find out the financial impact and failure symptoms of a bad motherboard or control unit. | — | pricing_page | control board failures and bulletins | 1x of 3 | |
navien customer service contact recall verification RELATED | Google ↗ AI Mode ↗ | Find official channels to contact Navien support to verify serial number recalls. | — | faq_page | official safety recalls and cpsc notices | 1x of 3 | |
navien motherboard replacement warranty coverage ENTITY EXPANSION | Google ↗ AI Mode ↗ | Determine if Navien covers control board or firmware-related hardware replacements under standard warranty. | — | buyers_guide | control board failures and bulletins | 1x of 3 | |
common navien tankless water heater failure symptoms RELATED | Google ↗ AI Mode ↗ | Identify early warning signs of heater failure that might indicate a firmware or component defect. | — | buyers_guide | common unit problems and fixes | 1x of 3 | |
how to reset navien tankless water heater after error RELATED | Google ↗ AI Mode ↗ | Find quick software or power-cycle reset procedures to clear temporary error states. | — | how_to_steps | firmware updates and error codes | 1x of 3 | |
signs your tankless water heater needs a service call PERSONALIZED | Google ↗ AI Mode ↗ | Evaluate whether current system behavior actually warrants hiring a professional plumber. | — | faq_page | hiring and consulting local plumbers | 1x of 3 |
Passes
Does another pass still surface new queries? A flattening curve means the fan-out has stabilised.
Geminix = pass, y = cumulative unique queries
| Model | Pass | Target | Generated | Seconds | Tokens (in / out) | Notes |
|---|---|---|---|---|---|---|
| gemini-3.5-flash-lite | 1 | 12 | 12 | — | 923 / 1,512 | |
| gemini-3.5-flash-lite | 2 | 12 | 12 | — | 923 / 1,522 | |
| gemini-3.5-flash-lite | 3 | 12 | 12 | — | 923 / 1,450 |