V39 · Specialized diagnostic
Tankless water heater: flow, capacity and maintenance
Size around inlet-water temperature, simultaneous flow, fuel/electric capacity, venting and maintenance rather than the “endless hot water” promise.
VERT / GREEN · JAUNE / YELLOW · ROUGE / RED triage
What the professional checks
The plumber/technician checks peak demand, inlet temperature, energy capacity, venting and water hardness.
Official / technical sources
Sources checked 2026-08-23. Local requirements and exact products control.
Related path
Continue with the right tools
These links connect this page to the next useful checks and decisions without repeating the full content.
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