Aprilaire 600 Whole Home Humidifier, Automatic High Output Furnace Humidifier, Large Capacity Whole House Humidifier for Homes up to 4,000 Sq. Ft.

Installing the humidifier went quite well. Since I have PEX on all my water lines I Tee'd into the piping and ran a line over near the solenoid valve and put a PEX shut-off at the end. The unit comes with a needle valve that is meant for copper pipe only. I had easy access to 120VAC for the transformer that supplies the solenoid valve. The humidifier drain was Tee'd into the 3/4" PVC drain line on the furnace. I put the outdoor air sensor for the humidistat on the intake of my HRV system close to the vent where it comes through the wall. I used 6" rigid duct and 90's to go from the humidifier to the return duct on the furnace. The unit comes with flexible 6" hose which I chose not to go with because the rigid won't have as much affect on air flow. I had to purchase the 18/5 and 18/2 thermostat wire needed to connect the humidistat to the furnace and solenoid valve and transformer. In summary I probably spent just over $100 on additional supplies ductwork, wiring and PEX pipe and fittings that was needed to install the humidifier. It took me a couple of days to put the system in and now it's up and running nicely controlling the relative humidity at 40%. So far I.m quite happy with the product.

I recently purchased the Aprilaire 600 Whole Home Humidifier, and I couldn't be happier with the results! Living in a dry climate, I've struggled with uncomfortable indoor air for years, but this product has truly transformed my home environment. Installation was surprisingly straightforward, thanks to the comprehensive instructions provided. Even for someone like me who isn't particularly handy, it took just a few hours to set up the Aprilaire 600. The build quality is excellent, and it's clear that this product is designed to last. One of the things I appreciate most is the automatic control feature. It maintains the perfect humidity level in my home without me having to constantly adjust settings. This has not only made the air more comfortable but also helped me sleep better at night and reduced static electricity, which was a common annoyance in the winter months. The performance is outstanding. Within a short period of time, I noticed a significant improvement in the overall comfort of my home. My skin feels less dry, my allergies have improved, and even my furniture seems happier with the added moisture. It's also a relief to know that maintaining the optimal humidity level can help protect my wooden floors and prevent them from cracking. In summary, if you're tired of dealing with dry air and its negative effects on your health and home, the Aprilaire 600 Whole Home Humidifier is a fantastic solution. It's reliable, easy to install, and delivers noticeable results. I couldn't recommend it more highly – it's been a game-changer for me, and I'm sure it will be for you too!

After years of trying to increase humidity during the winter months using portable ultrasonic humidifiers, we finally purchased the 600A model for the furnace. Can't believe i waited so long now that I have the whole home unit installed. On a cold Alberta day, without humidification we would see humidity levels inside the house of 15% or lower. Obviously not the ideal levels during the cold and flu season, or for wood shrinkage of trim, floors, etc. Install is fairy easy if you have the correct tools and some general knowledge of electrical work. I installed the unit on the return air plenum due to space restrictions and then piped the bypass into the supply side, well above the AC condensing coil. Outside temperature sensor will require drilling through an outside wall to pull the wire through. Don't rush the install. Make sure you cut the template precisely into your furnace plenum because there is not much room to screw into the sheet metal if you cut the hole too large. *I opted to NOT use the provided saddle valve because of they're prone to leaks. Instead, I used a 1/2"×1/2"×1/4" Sharkbite fitting with its own shut off valve. You'll also need to buy additional thermostat wire (4 wire) to complete the wiring from the furnace control panel to the humidifier controller. I needed to buy a couple 90 degree elbows and a longer 6" diameter semi rigid duct hose. After installation, the unit ran continuously for approximately 3 days to bring humidity levels up to 40%. The-25 Celsius weather obviously didn't help, as the furnace was running a heating cycle quite often. The unit maintains 35-40% humidity automatically in our home with the dial set at 4. I keep my furnace fan running 24/7 to ensure constant supply of fresh air and help with heat distribution from main floor to basement. Overall, very happy with the performance and how easy it now is to maintain the humidity level inside our 3300 sq ft of living space.

My older AprilAire (44x series) whole house humidifier unit finally gave out after decades of service and outlasting the original furnace. I chose this unit as the replacement, hoping it would be an easy drop in. I was partially correct. The plenum cutout was entirely different. The new cutout required more total area, but the width was much narrower requiring the plenum to be patched with a sheet of galvanized sheet steel. Cutting the sheet before it was patched onto the plenum was easy, but enlarging the height of the existing plenum hole was a bit challenging to accomplish with normal tin-snips. I ultimately made the cut with a diamond cutoff wheel on my cordless angle grinder. After a few pop-rivets to marry the patch to the plenum and a few grinder sparks later, I was ready to mount the new humidifier. Be sure to follow the supplied template for creating the hole. Because this was a replacement for the previous generation humidifier, the water valve and piping, the hot-air bypass, and the humidistat were already present along with a sophisticated control and electronic interface module already set up to a well-know Minnesota manufacturer's electronics. The furnace also has an infinitely variable speed blower which maximizes the effectiveness of this humidifier. I took advantage of this maintenance activity and installed a condensate pump which allowed me to move the multiple hoses that previously ran across the floor, into the ceiling rafter space. This neatened up the entire installation, making routine cleaning of that area much easier. I turned the system on and the house was up to the 40% humidity set-point in a few hours. My system is smart enough that when the outdoor temperature dropped to -30 for a few days, the humidity was automatically reduced to avoid frost and ice build-up on the windows. It took a couple days to fine tune these settings, but I had less frost on the windows than I had in the past. I cannot speak to how the AprilAire-supplied humidistat might work because I used my own system that was already in place. For those who complain that this device uses too much water... the saddle valve is... a valve. Turn it down a bit. It is necessary to get enough water to wet the humidifier water pad, but that probably doesn't require you to run the water full blast. I adjusted mine by watching the water as it drained from the system "while in use, as used". In other words, adjust this with the furnace actually running and heating. As I currently have it adjusted, I get far more water from the furnace combustion product than I do from the humidifier.

I bought this humidifier at a discount for being an open-box product, likely a return. It arrived with no missing or damaged parts and all the paperwork was there. My home is 2625 sq/ft including the basement and the next smaller model would have been sufficient. However, I have an on-demand electric water heater and the humidifier doesn't flow enough water to kick it on (thankful for that energy savings). Since the only hot water entering the humidifier would be what little is in the main hot trunk, I got the next bigger model to make up for using cold water. Installation was a pretty simple DIY project for someone that has the tools and can read directions. Tin snips, a holesaw kit, wire strippers, and some screwdrivers was about the extent of it. Having access to your furnace and thermostat owner's manuals is helpful as well. I set the humidistat up for auto humidity control using the outdoor temp sensor but without auto fan control since the unit will see mostly cold water. I mounted the outdoor temp sensor in my furnace's draft inducer fresh air pickup pipe just inside the band joist per the alternate mounting location instructions in the manual. On startup, the unit kicked on with every heat call to the furnace until my house went from 31% RH to 45% RH in about a day. Just a few days ago here in Michigan, outdoor temps dropped to 18-deg at night and the humidistat compensated by dropping RH to 38%. I have since adjusted the dial up and down, adjusting the target RH in auto mode, found the point where my windows just start to condensate, and backed down one notch from there. After operating this unit for over a month, I have verified its RH accuracy with another hygrometer in other rooms of the house. The humidistat's auto control has been spot on thus far, keeping the highest RH in the house without allowing condensation on the windows. My family has noticed our dry sinus issues have improved and I have noticed that my furnace runs less as the humid air is easier to heat.