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400 Series

Listed below are all the replacment components for your Aprilaire Model 400 humidifier.  We only recommend and sell "Genuine" Aprilaire Water Panels and Aprilaire parts to maintain the level of performance you have come to expect from your Aprilaire Humidifier. 
 
All parts are shipped in "single" carton quantities with the exception of #45 Water Panel which is a 2 pack.

 
Displaying products 1 - 16 of 16 results
Aprilaire Water Panel #45 (1 - 2 Pak)
MSRP: $39.99
Price: $28.69
You Save: $11.30 (28 %)
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Aprilaire Water Panel #45 (1 - 2 Pak)
The Water Panel in your Aprilaire 400 series humidifier needs to be replaced two times a year. Make sure to use Genuine Aprilaire replacement parts.
Aprilaire Water Panel #45 (2 - 2 Packs)
MSRP: $79.98
Price: $51.99
You Save: $27.99 (35 %)
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Aprilaire Water Panel #45 (2 - 2 Packs)
SAVE BIG TIME WHEN YOU BUY A 4 PACK! The Water Panel in your Aprilaire 400 series humidifier needs to be replaced two times a year. Make sure to use Genuine Aprilaire replacement parts.
Aprilaire Water Panel #45 (5 - 2 Paks)
MSRP: $199.95
Price: $110.99
You Save: $88.96 (44 %)
Aprilaire Water Panel #45 (5 - 2 Paks)
SAVE BIG TIME WHEN YOU BUY A 10 PACK! This is for a carton that contains 5 cartons with 2 filters in each in carton. The Water Panel in your Aprilaire 400 series humidifier needs to be replaced two times a year.
Part #4001 - Water Saddle Valve
Price: $14.49
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Part #4001 - Water Saddle Valve
Water Saddle Valve
Part #4004 - Water In Line Strainer
Price: $5.99
Part #4004 - Water In Line Strainer
Removes small water particles that can plug up the water solenoid valve and orifice
Part #4231 - Yellow Orifice
Price: $2.79 Each
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Part #4231 - Yellow Orifice
Meters the amount of water that goes to your Aprilaire Humidifier
Part #4335 - Water Feed Tube
Price: $29.99
Part #4335 - Water Feed Tube
Water feed tube system to deliver water from the solenoid valve to the distribution tray.
Aprilaire 400 Series Maintenance Kit
MSRP: $92.00
Price: $82.99
You Save: $9.01 (10 %)
Aprilaire 400 Series Maintenance Kit
The easiest way to make your Aprilaire like new!
Model 50 Relay
Price: $38.99
Model 50 Relay
Aprilaire Model 50 Current Sensing Relay
Part #4010 - Transformer
Price: $27.99
Part #4010 - Transformer
Aprilaire 4010 replacement transformer
Part #4040 - Water Soleniod Valve
Price: $78.99
Part #4040 - Water Soleniod Valve
Water solenoid valve
Part #4403 - Scale Control Insert
Price: $24.99
Part #4403 - Scale Control Insert
Scale Control Insert for Aprilaire Model 400 Humidifier
Part #4405 - Model 400 float Cover
Price: $15.99
Part #4405 - Model 400 float Cover
Aprilaire Float Assembly Cover
Part #4406 - Model 400 Float Assembly
Price: $20.99
Part #4406 - Model 400 Float Assembly
Aprilaire Model 400 float assembly
Part #4407 - Water Distribution Tray
Price: $26.99
Part #4407 - Water Distribution Tray
Water distribution tray to evenly distribute water to the water panel evaporator
Part #4655 Manual Humidistat
Price: $55.99
Part #4655 Manual Humidistat
Aprilaire Manual Humidistat - Part #4655
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WE ACCEPT: DISCOVER, MASTER CARD, VISA, AMERICAN EXPRESS AND PAYPAL When you buy from us you can rest assured that the replacement filters and parts are "Genuine" Aprilaire products - the only kind recommended by Aprilaire.