HVAC Systems and Applications! - Resources, Tools and Basic Information for Engineering and Design.
Hot water heating systems may be classified by pressure or piping scheme
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Water heating system may be be classified by working pressure
| Type | Abbreviation | Flow temperature
oC |
Temperature drop
oC |
| Low Pressure Pumped Circulation | LPHW | 50 - 90 | 10 - 15 |
| Low Pressure Gravity Circulation | 90 | 20 | |
| Medium Pressure | MPHW | 90 - 120 | 15 -35 |
| High Pressure | HPHW | 120 - 200 | 27 - 85 |
or by piping scheme
- One-pipe or two-pipe system
- Up-feed or down-feed system
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