ASHRAE liquid classes by max supply water temp (17/27/32/40/45 °C, plus W+); all share a 2 °C lower limit
W17–W45+observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2025 |
| Source | ASHRAE TC 9.9 Thermal Guidelines 5th ed.; Upsite |
| Review | checking…review by 2027-05-31 · slow cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | ashrae-liquid-classes-by-max-supply-water-temp |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.