Rheem

The Tier1 water panels on this page come in two Aprilaire sizes, #10 and #35, and are sold in 2-packs. If you have a Rheem whole-house humidifier, confirm the size of your current pad before ordering. Aprilaire's guidance is to change these panels every year.

How to check fit

Whether a Tier1 panel fits your Rheem humidifier comes down to pad size.

• Find any part number printed on your Rheem pad.
• Note the pad's dimensions with a tape measure.
• Check those details against the #10 and #35 listings. On Aprilaire humidifiers, the #10 is used in the 110, 220 and 500 series, and the #35 in the 600 and 700 series.

Common questions

Which pad fits my Rheem humidifier?

The pad that fits your Rheem humidifier is one that matches your current pad's size. A Tier1 #10 or #35 panel works only when your Rheem pad has the same dimensions.

How often should you change a humidifier pad?

A humidifier pad in the #10 or #35 size should be changed once a year, according to Aprilaire. Need a different size? Browse all humidifier water panels.