Super alloy- I did contact my distributor and talked to them several times. They sent their installers out to look at the old rotten window and did nothing. I have the paper work stating the wood has a five year warranty. They claim, whatever super sealant they spray on the pine, makes it not rot. My all wood window which I caulked yearly, rotted between the sill plate and the bottoms of the windows. The hardware for the casement was screwed into totally punky wood.
Between the casements and the fixed window, it also rotted. There was NO caulking in these areas, which allowed water in. These are joints put together at the distributor, not out in the field. Their theory is if it was caulked, the water getting in couldn't escape. OKAy makes sense, but then the water that does get in, can sit and rot out the wood.
The last house I had, I built myself and it had all Pella windows and doors. I never had any problem with them, although I bought them in 1989. That house though had a two foot overhang, which really protects the windows and siding. The house I'm in now has NO overhang at all, and the south windows really get the full brunt of wind and rain.
The problem with Pella clad or solid wood windows is the design. Despite their advertising claims to the contrary, these windows are destined to fail, if exposed to any amount of wind driven rain. Even the FIXED window has a 3/8 inch gap around the perimeter, with a seal, that allows water into the interior of the frame. The only thing keeping rain and wind from entering the house is a small seal on the interior of the window. This seal has the ability to compress about 1/8 of an inch. In the corners this seal isn't even carefully mitered. Any flaws in the seal, or if the window isn't PERFECTLY plumb, or if the wall has a slight bow, it does not allow the window to seal. Stupid. It doesn't take a rocket scientist to see what a poor design they have. As a company they should take care of someone who has spent around forty thousand dollars with them. I bought the triple pane window simply because I figured I'd get the most efficient window they have. Too bad, the mechanical portion of the window makes the glass portion a waste. I get air and water coming in the corners of the swing out casements of my new window. They're coming next week to replace the seals.