Honeywell - HM750 Advanced Electrode Steam Humidifier

I prefer the Honeywell advanced electrode humidifier HM750A. Maintenance service is simple - essentially a replacement electrode kit and easy to install.

HM750 would be sort of overkill for an apartment. You would also need to run a new dedicated circuit from your panel to the location (not sure if that is feasible). A 120V circuit would be plenty. The plenum design is also not optimal for steam dispersion, usually you want a several foot duct section with no branch ducts where the steam nozzle is located. If I was quoting this job, I would give you the option of Model 500 or the HM750 (provided there is a wire route to the panel), but the latter would be significantly more expensive. I will say there seems to be this impression out there that bypass humidifiers suck, and somehow fan is way better. In reality bypass and fan units are pretty close in performance (both depend on furnace runtime), and steam is the magic bullet. But steam is significantly more expensive and is sometimes difficult to install unless the electrical panel is nearby. It also usually has greater electricity costs (doesn't matter in your case since you have an electric furnace). Bypass will work just fine for 75% of installs. So I guess my point is bypass is sometimes all you need.

Both April Aire and Honeywell work fine pick whichever fits your setup better. Main thing is your electrical steam units need more juice so check if your transformer and wiring can handle it before you start. Make sure there's a shutoff on the water line or add one. Taking the old one out without screwing up the ducts is the worst part so just take it slow there. Steam to steam swap isn't too bad though follow the instructions and don't rush it.

they are fine. If you have the ability to do the steam one its insanely good at getting moisture in the air and cost effective. The hot water loopback ones are pretty good, mine will keep my house maintained if I cycle the fan.

honestly, you want either a steam powered humidifier if you have the money and forced air to do it, or if you have to get something else, make sure its a HOT water humidifier. The ultrasonic humidifiers are pretty much useless in CO and waste a lot of energy. I have two Honeywell hot air humidifiers that can handle about 1000 sq ft each.