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Model Description:
The aprilaire 550 bypass humidifier is an economy unit designed for smaller homes. this unit utilizes a manual humidifier control that can be installed in the living area or on the furnace ductwork. along with all other models (except model 448) it is equipped with a drain to flush minerals from the system. the model 550 has an evaporative capacity of 0.50 gallons per hour and can handle up to 3,000 square feet if the home is tightly constructed.
Additional Model Information:
Saddle valves and transformer
View Owner's Manuals for Aprilaire 550:
Part Categories for Aprilaire 550:
Complete Units | Controls | Covers | Filters | Frames | Hoses, Valves, and Regulators | Other Parts | Panels | Transformers | TubingAccessories for all Humidifiers:
Chemicals | Complete Units | Other PartsAll Parts for Aprilaire 550: | ||||
|---|---|---|---|---|
Complete Units | ||||
| Ref. | Image | Part No & Description | Price | |
 | APR550 - Complete Unit Going Nla D Ship From Lars View Part Info | $0.00 | Not Available | |
Controls | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr8052 - Outdoor Temperature Sensor View Part Info | $11.53 | Add to cart | |
| 15A |  | APR56 - Humidistat For Autotrac Has Outdoor Temp View Part Info | $92.58 | Add to cart |
| 18 |  | apr4305 - Gasket Automatic Humidifier Control View Part Info | $4.73 | Add to cart |
Covers | ||||
| Ref. | Image | Part No & Description | Price | |
| 17 |  | apr4225 - Cover Latch Spring View Part Info | $9.33 | Add to cart |
| 7 |  | apr4222 - Cover With Latch And Label View Part Info | $77.90 | Add to cart |
Filters | ||||
| Ref. | Image | Part No & Description | Price | |
 | a10wr-rps - Wicking Style Filter #709 View Part Info | $12.12 | Add to cart | |
| 1 |  | aprA10-RPS - Aprilaire #10 Pad Hard Wick View Part Info | $7.83 | Add to cart |
Frames | ||||
| Ref. | Image | Part No & Description | Price | |
 | APR4598 - Ionizer Frame Assembly View Part Info | $173.45 | Add to cart | |
| 2 |  | apr4217 - Filter Frame For Aprilaire View Part Info | $18.07 | Add to cart |
| 3 |  | APR4218 - Distributor Tray For View Part Info | $17.42 | Add to cart |
Hoses, Valves, and Regulators | ||||
| Ref. | Image | Part No & Description | Price | |
 | A01-0814-148 - Water Valve 24 Volt View Part Info | $62.42 | Add to cart | |
| apr4229 - Saddle Valve Adapter View Part Info | $51.54 | Add to cart | |
| 10 |  | apr4004 - In Line Strainer View Part Info | $4.99 | Add to cart |
| 11 |  | APR4001 - Saddle Valve For Aprilaire View Part Info | $19.99 | Add to cart |
| 12 |  | APR4231 - Orifice Yellow View Part Info | $4.20 | Add to cart |
| 16 |  | apr4184 - Nozzle For Aprilaire View Part Info | $9.33 | Add to cart |
| 8 |  | apr4223 - Drain Spud For Aprilaire View Part Info | $4.31 | Add to cart |
| 9 |  | apr4040 - Water Valve. Can Also Use A01-0814-148 View Part Info | $69.99 | Add to cart |
Other Parts | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr4039 - Plate Humidstat View Part Info | $9.33 | Add to cart | |
 | apr4280 - Shock Arrestor View Part Info | $129.20 | Add to cart | |
| APR4526 - Aprilaire 550 Duct Panel View Part Info | $52.99 | Add to cart | |
 | APR51 - Current Sensing Relay View Part Info | $38.68 | Add to cart | |
 | GA50 - Relay Current Sensing View Part Info | $36.00 | Add to cart | |
| 15B | | APR4655 - Manual Humidistat View Part Info | $47.28 | Add to cart |
| 4 | | APR4219 - Base 550 View Part Info | $75.21 | Add to cart |
Panels | ||||
| Ref. | Image | Part No & Description | Price | |
| 5 | | APR4220 - End Panel Model 550 View Part Info | $57.12 | Add to cart |
| 6 | | APR4221 - Duct Panel View Part Info | $52.99 | Add to cart |
Transformers | ||||
| Ref. | Image | Part No & Description | Price | |
| 14 |  | apr4010 - Transformer For Aprilaire View Part Info | $28.40 | Add to cart |
Tubing | ||||
| Ref. | Image | Part No & Description | Price | |
 | 35548801 - Drain Hose 10 Foot View Part Info | $9.99 | Add to cart | |
| 13 |  | apr4226 - Feed Tube With Compression View Part Info | $12.17 | Add to cart |
Accessories for all Humidifiers: | ||||
Chemicals for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | FSRM6 - Humidafresh Rainforest Mist Water Treatm View Part Info | $6.24 | Add to cart | |
| AC802 - Humidifier Bacteriostatic Water Treatmen View Part Info | $6.82 | Add to cart | |
 | 1T-6 - Humdf Water Treatment32 Oz View Part Info | $5.18 | Add to cart | |
 | FSCA6 - Humidafresh Cinnamon Apple Water Treatme View Part Info | $6.24 | Add to cart | |
 | AC816 - Extra Strength Humidifier Cleaner View Part Info | $5.19 | Add to cart | |
 | FSFV6 - Humidafresh Vanilla Water Treatment View Part Info | $6.24 | Add to cart | |
 | 3US-6 - Water Treatment Cleaner View Part Info | $5.01 | Add to cart | |
 | 1PC-RPS - Humidifier Plastic Cleaner View Part Info | $0.00 | Not Available | |
Complete Units for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | HAP-440 - Holmes Complete Hepa Air View Part Info | $49.99 | Add to cart | |
Other Parts for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | MSP-100V - Oem Portable Stereo Speaker View Part Info | $16.99 | Add to cart | |
