What are the code requirements in Massachusetts for installing a thermal expansion tank alongside a Navien tankless unit?
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Fan-out diagram
The searches the AI actually ran for this prompt.
SEED QUERY
What are the code requirements in Massachusetts for installing a thermal expansion tank alongside a Navien tankless unit?
3 real searches · 1 real-search pass
Massachusetts 248 CMR thermal expansion tank water heater code closed system expansion controlGoogle ↗
OBSERVEDReason
Navien tankless water heater installation manual thermal expansion tank required closed systemGoogle ↗
OBSERVEDReason
Massachusetts plumbing code adopted 2026 248 CMR 10.00 water heater thermal expansionGoogle ↗
OBSERVEDInstruction
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). 3 of 3 calls are low-confidence (under 50%) — hover a query in the table to see its confidence.
Searches and sources
ChatGPT3 real searches · gpt-6
Massachusetts 248 CMR thermal expansion tank water heater code closed system expansion control Google ↗
Navien tankless water heater installation manual thermal expansion tank required closed system Google ↗
Massachusetts plumbing code adopted 2026 248 CMR 10.00 water heater thermal expansion Google ↗
Queries
3 queries · click a column to sort
| Query / type | Search | Intent | Query class | Routing format | Cluster | Freq ↓ | Weight |
|---|---|---|---|---|---|---|---|
Massachusetts 248 CMR thermal expansion tank water heater code closed system expansion control OBSERVED | Google ↗ AI Mode ↗ | — | Reason | — | — | 1x of 1 | |
Navien tankless water heater installation manual thermal expansion tank required closed system OBSERVED | Google ↗ AI Mode ↗ | — | Reason | — | — | 1x of 1 | |
Massachusetts plumbing code adopted 2026 248 CMR 10.00 water heater thermal expansion OBSERVED | Google ↗ AI Mode ↗ | — | Instruction | — | — | 1x of 1 |