VERT / GREEN
List simultaneous fixtures and seasonal cold-water temperature.
Tankless water heater: demand, energy and maintenance
Verify simultaneous flow, temperature rise, fuel/power, venting and maintenance before replacing a tank.
This tool is for triage and documentation; structural, fire, gas, refrigerant and electrical work remains subject to applicable rules and professionals.
JAUNE / YELLOW
An undersized unit can run out of flow; gas/propane adds combustion/venting while large electric units can need substantial power.
ROUGE / RED
Insufficient electric/gas service, unknown venting or hard water with neglected maintenance: verify before purchase.
Indicative triage
Useful tools and data
- Fixture flow rates
- Incoming-water temperature
- Energy-service data
What the professional checks
- Calculate flow/temperature rise
- Verify power/fuel/venting
- Plan water-quality maintenance
Official sources
Sources checked / sources vérifiées: 2026-08-22
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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V18
Specialized diagnostics to verify
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V19
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V26
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V27
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V28
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V29
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V31
Commissioning and everyday safety
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