menu 
Small to Medium \ Single Blower Units
| Series | Heat/Cool | Water Valve | OEM Only | Notes |
| 500-C | Cool only | |||
| 500-HC | Heat & Cool | |||
| 502 | Cool only | |||
| 505-HC | Heat & Cool | |||
| 800-C | Cool only | |||
| 800-HC | Heat & Cool | |||
| 804 | Heat & Cool | Yes | ||
| 818 | Heat & Cool | Yes | ||
| 821 | Heat & Cool | Yes | Dual heater core | |
| 822-HC | Heat & Cool | Yes | ||
| 823-HC | Heat & Cool | Yes | More heat\less cooling | |
| 830 | Heat & Cool | Yes | ||
| 840 | Heat & Cool | Yes | Yes |
Large \ Dual Blower Units
| Series | Heat/Cool | Water Valve | OEM Only | Notes |
| 810 | Heat & Cool | Yes | ||
| 811-M | Heat & Cool | Yes, manual | Yes | |
| 819 | Heat & Cool | Yes | ||
| 820 | Heat & Cool | Yes | ||
| 8005-HCR | Heat & Cool | Yes, electric | Yes |