Choosing the right solenoid valve for a home humidifier or similar water-delivery system is essential for consistent humidity and reliable operation. The products below focus on 4040-style solenoid valves, compatible with a wide range of Aprilaire and similar models. This guide highlights performance, durability, and compatibility to help you select a practical replacement or upgrade for your system.
The following table provides a quick overview of the chosen products to help you compare options at a glance.
| Product | Brand | Key Compatibility | Voltage | Watts |
|---|---|---|---|---|
| Humidifier Water Solenoid Valve 4040 Yellow | TOMOON | Aprilaire models 110–760 series | 24V | 2.3W |
| 4040 Humidifier Solenoid Valve Replacement Part | AMI PARTS | Replacement for 400, 500, 600, 700 series | 24V | 2.3W |
| 4040 Humidifier Solenoid Replacement Water Valve A2012-S118 | PETOX | Aprilaire 400–760 series | 24V | 2.3W |
| AprilAire 4040 Solenoid Valve, 24 Volt | Aprilaire | Whole House Humidifier 400–768 | 24V | — |
| IDEASURE 4040 Solenoid Valve – 24V | IDEASURE | 600–700–440–760–400–500 series | 24V | — |
Note: All models listed use a 24 V DC-compatible solenoid with typical power around 2.3 watts. The exact compatibility can vary by model, so verify your humidifier’s model number and your valve’s threaded and installation requirements before purchasing.
Humidifier Water Solenoid Valve 4040 Yellow — TOMOON
This TOMOON 4040 valve is designed to regulate water entry into Aprilaire whole-house humidifiers, maintaining humidity in the 35%–45% range. It’s compatible with a broad set of Aprilaire models, including 110, 112, 220, 224, 350, 360, 440, 550, 550A, 558, 560, 600, 700, 760, and 768. The valve operates at 24 volts and 2.3 watts at 60 Hz, and it ships with essential hardware for installation. The yellow version is a common standard in this configuration, offering reliable performance when installed correctly.
Features: 24V, 2.3W, 60 Hz; includes installation hardware; compatible with multiple Aprilaire humidifier models, ensuring synchronized humidity control. If you’re replacing an aging valve, this unit provides a straightforward upgrade path with known compatibility across many popular humidifier models.
4040 Humidifier Solenoid Valve Replacement — AMI PARTS
AMI PARTS offers a 4040 solenoid valve replacement designed for Aprilaire humidifiers, including 400, 500, 600, 700 series. The Brass-made valve operates at 24 volts with 2.3 watts of power and is intended to deliver precise water flow to achieve balanced humidity. It has been tested for durability and compatibility with multiple replacement numbers, including NO.100006735 and related part numbers. This replacement part emphasizes robust construction and compatibility with OEM standards, helping to ensure consistent humidity delivery in a wide range of home systems.
Features: 24V; 2.3W; brass construction; compatible with multiple Aprilaire models; includes replacement fitments for easy installation. It’s positioned as a premium replacement part in many DIY humidifier repair scenarios, designed for straightforward swap-out when an older valve fails to shut off or regulate flow properly.
4040 Humidifier Solenoid Replacement Water Valve A2012-S118 — PETOX
PETOX markets a 4040 solenoid valve replacement intended for Aprilaire humidifier models such as 400, 550, 558, 600M, 700, and 768. The valve is built with brass and stainless-steel components for durability and includes a compression nut, washer, and inline strainer. It runs on 24V with 2.3W power and emphasizes wide compatibility with a long list of replacement numbers (A2012-S118, B2035-S2, B2035-S5, B2035-S54, etc.). The design focuses on providing a stable water flow control to help maintain indoor humidity within the target range.
Features: Brass/stainless construction; included hardware for installation; broad model compatibility; 24V, 2.3W; designed for steady, controllable humidity delivery in residential humidifiers.
AprilAire 4040 Solenoid Valve — Official Part
This is the genuine AprilAire 4040 solenoid valve, manufactured to optimize the performance of AprilAire Whole House Humidifiers (models 400, 400M, 500, 500M, 600, 600M, 558, 550A, 550, 568, 560A, 560, 700, 700M, 768, 760A, 760). The kit includes an inline strainer, compression sleeve, and compression nut, and the valve controls the amount of water entering the humidifier. As an OEM component, it’s designed for exact fit and reliable operation within the original system specifications.
Features: Genuine OEM part; includes inline strainer and necessary install hardware; designed to deliver precise humidity by regulating water intake; compatible with a broad set of Humidifier models in the Aprilaire lineup.
IDEASURE 4040 Solenoid Valve — 24V
IDEASURE’s 4040 solenoid valve is positioned as a compatible option for a range of humidifiers, including Aprilaire models 220, 400, 440, 500, 550, 560, 600, 700, 760, and 768, among others. It’s built to match OEM-style valve replacements and is compatible with several Lennox and Carrier humidifier units as well. The valve is rated at 24V and 2.3W, and the listing emphasizes easy installation and a high-quality build tested by the manufacturer. It’s marketed as an OEM-compatible retrofit with straightforward compatibility checks before purchase.
Features: 24V; 2.3W; OEM-compliant; broad model compatibility; includes standard installation hardware and a focus on reliable shutoff and humidity control.
Buying Guide: Key Purchase Considerations
- Model compatibility: Verify your humidifier model number and part numbers such as 4040, A2012-S118, B2035-S2, B2015-S85, and B2017-S85 to ensure a perfect fit. Some valves replace multiple numbers across Aprilaire and other brands.
- Voltage and power: Most 4040 valves operate at 24V and around 2.3W. Confirm your system’s power supply to prevent under or over driving the valve.
- Material quality: Brass or brass-brass/stainless combos improve durability. Look for valves with robust seals, compression fittings, and included hardware for easy installation.
- Installation ease: Many listings include compression nuts, washers, and strainers. A simple screwdriver and wrench may suffice for replacement; ensure you have the right tools before purchasing.
- OEM vs aftermarket: OEM parts (like Aprilaire official valves) typically guarantee compatibility with the original humidifier design, while aftermarket parts may offer similar performance at a lower price but require careful compatibility checks.
- Maintenance and longevity: A well-constructed solenoid valve should resist mineral buildup and provide reliable shutoff. Look for models with a history of durable operation in humidifier circuits.
- Warranty and support: Check the seller’s warranty terms and customer support in case a valve does not seal properly or fails prematurely.
When selecting a solenoid valve, balance compatibility with your humidifier model, the valve’s construction quality, and the availability of installation hardware. The listed options provide a range of OEM and aftermarket products with broad compatibility, aiming to deliver stable humidity control and minimize maintenance needs.