AprilAire 4839 Maintenance Kit with Water Panel Model No 35 Replacement Filter for Whole-House Humidifier Models 600 600A

I liked that the parts were new and fit properly. It was higher priced than the off-brand kits and well worth the extra cost. Service from AprilAire has been very good Read more

Works great in my April Air Humidifier. Read more

So I thought my water heater was leaking but on further investigation I discovered the water was actually coming from my dehumidifier. I took off the cover and observed that there was some water on the housing under the filter area. I cycled on the heat and watched the water going into the top of the filter housing and it looked to me like everything was working properly. I speculated that maybe there was a crack in the bottom of black plastic filter frame but on inspection I couldn't find one. So I ordered this kit and installed it. It's a simple install except getting that little red inline strainer out of the solenoid valve was a bit of a PITA and I didn't bother to replace the drain "spud" (love that name). After I put it all back together I turned it on and - no more leaks. At the end of the day I think that I may have oversized my orifice while performing my annual filter replacement. It was clogged so I used my smallest wire type gauge (from a carburetor cleaning tool) as reamer. After I'd installed the new one, I observed that the flow into the filter water distribution tray was less then before so perhaps I was flooding the filter and causing an overflow? Whatever the cause, I'm happy to have fresh parts and no more leaks. It's probably a good practice to replace all this stuff every 5 years or so anyway. All the parts I replaced were certainly feeling and looking a little stiff and crusty. I ordered a couple of extra filters so I think I'm all set for another couple years. Read more

My house central AC/heat unit is equipped with Aprilair 400 humidifier. It worked properly, but I was concerned about stale water collecting at the bottom of the panel housing. Water did turn green, and introduction of in-line antimicrobial filter together with occasional sprinkling with tea tree oil (powerful antiseptic) help alleviating this situation to a degree. I still wanted to convert 400 model into 600 model that uses running water. This particular maintenance kit helped me to achieve this. Previous reviewer described several stages of the conversion, I just want to add that the supplied funnel snaps into the humidifier housing, and fits perfectly. It has 1/2 inch diameter extension to fit a water drain tube (I got a transparent tube from HD to channel water into sump pump) Overall, this kit fits 400 housing with no issues, and I did not need to change 400 humidity controller. My first results to use the converted humidifier were positive. I needed to maintain above 40% humidity level in my house during the winter period to help my newborn baby to breath easy through the night. I could see that humidifier was running water every time furnace got activated to maintain this relatively high humidity level. But couple of month later, the setup had a harder time to maintain this level, it could barely keep it around 40%. I attribute this to wearing out of the humidifier water panel supplied with the setup. It seems that the panel (made of aluminum mesh layers fused together) had some sort of deposits that helped retaining steaming water. These deposits wear out with time, and the panel has much harder time to allow for proper water/air interaction. I had to revert to the original panel, No 45, designed for Aprilair 400 series as it has lots of paper layers to soak in water. After this, humidifier could easily increase humidity level to a desired value. So I subtract one star for the supplied panel No 35 behavior - it seems strange to me that it "wears out" so fast. Read more

I really just ordered this for the bracket and tray, but getting all the extra parts was nice. I'm hanging on to them for future replacement. This came with all the pieces to those attachment from the solenoid to the humidifier (plus a new hose, which is not included in the product pictures), the gasket for the base of the humidifer for the drain tube, a new pad, the black bracket and tray. The pad is a branded Aprilaire replacement pad. I've been using off-brand for years, this is actually the first time I've even had a branded pad since it was new. The bracket was 100% identical to the bracket I replaced. I didn't really need to do so, but the old one was funky with deposits on it so I figured I didn't need it anymore. The main draw here, for me at least, is the tray. The tray that came installed with my unit had nothing in its base to guide the water to distribute evenly. It was just smooth plastic. But the tray that came in this package has a pad across the bottom with grooves that I assume are meant to help with that even distribution. With my old tray, the water always seemed to pool on the left side (I think the unit isn't 100% level) and occasionally spill over the top. So far, this new tray seems to work much better. I could not possibly tell you if these parts are all Aprilaire OEM parts, nothing came in a branded box but the humidifier pad. But every piece seems to be of identical quality and construction. The only difference is the tray. If this tray is an OEM Aprilaire product, then I would love to know what was used in my original install. Regardless, the tray is great! Read more

Our Aprilaire humidifier is 20 years old, and over the years we have tried to clean the original water panel periodically. It finally got to the point where it was completely covered with mineral deposits that it prevented the system from running at all. We took a gamble on this product and it worked great. We swapped in the water panel and other parts and our Aprilaire is running like new again! It was all very easy to swap out too! Read more