Should I replace my old Aprilaire 445?

I have an older Aprilaire 445 (maybe 15 yrs) that I haven't used in years. I just turned it off a few years ago when it started leaking. I think it was a bad float. It's the model that has a pump in it to keep the water flowing over the media and therefore does not require a drain. It's a bypass type and is mounted above the furnace to the supply plenum. Well, the family is now complaining that it gets too dry in the house, so I need to either fix it or get something new. House is about 2,500 sq ft, well insulated, and we are in PA. Gas furnace is maybe 7 yrs old. I've read through some posts on here and have a few questions: 1. Is it OK to mount the newer models on the supply plenum? 2. I don't have a basement drain but do have a condensation pump. Is this pump sufficient enough to use a flow-through humidifier? 3. I have a humidistat in the dining room that controls(controlled) the 445. If I get a new model with a humidistat, can I use the same wiring? 4. The current opening in the plenum is approx 13.5W x 11H. Most new models require a smaller opening. Any easy way to reduce this? 5. Is there a brand/model that would be the easiest replacment? 6. Or should I just throw new parts at the old 445 and live with it? Thanks guys. [QUOTE=PaJohn;1293685] 1. Is it OK to mount the newer models on the supply plenum? Yes you can, if the holes don't match with the new one, I would just patch the hole, use that patch for the bypass duct. 2. I don't have a basement drain but do have a condensation pump. Is this pump sufficient enough to use a flow-through humidifier? Yes, the pump will keep up just fine. 3. I have a humidistat in the dining room that controls(controlled) the 445. If I get a new model with a humidistat, can I use the same wiring? Yes, you can. 4. The current opening in the plenum is approx 13.5W x 11H. Most new models require a smaller opening. Any easy way to reduce this? You can patch it as I said earlier. 5. Is there a brand/model that would be the easiest replacment? They are all the same to me in my book, I think Honeywell will be easier to find since they are sold at Home Depot, or other stores. 6. Or should I just throw new parts at the old 445 and live with it? Can you get parts still?? Do you know what was or where it was leaking? I also have a 445 (no floor drain either. A few years ago, I got some parts/filters from : http://www.aprilaire.com/

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