Trane is part of Trane Technologies, alongside its sister brand American Standard. Many Trane whole-house humidifiers are built around the same water panel design Aprilaire uses, so the replacement for your Trane unit is typically an Aprilaire #10 or #35 equivalent rather than a Trane-specific part.
We carry Tier1 comparable water panels in both sizes, sold in 2-packs. The #10 is the panel used in Aprilaire's Models 110, 220, 500, 550, and 558, while the #35 fits Models 600, 700, and 760. Check the part number on your current panel or the label inside your humidifier's cover to confirm which size you need.
The water panel is where moisture evaporates into your home's air, and mineral scale builds up on it over time. Replace it once per heating season, or sooner if it turns stiff, cracked, or heavily scaled, to keep your humidifier working efficiently.
Not sure which panel fits your Trane humidifier? Call 1-800-277-3458.