Originally Posted by
Nakanai
There aren't really that many differences between 10 and 25man healing. The main one is that you do a lot less (by which I mean "practically none") tank healing in 25man. T30 and T90 talent choices are usually different in 25man vs 10man (Chi Burst and Chi Torpedo are a lot more commonly used). But if you say you know how to play a MWer in 10man, then you know how to play it in 25man. Maximize ReM usage, use TFT before raid damage is coming out, burst heals with Uplift. Except that now you have Chi Burst & Chi Torpedo for more AoE burst heals (i.e., don't just mindlessly use Chi Burst on CD the way you would w/ Chi Wave; you can save it a few seconds if there's AoE coming up). Obviously, Xuen, RJW, Chi Wave, and Zen Sphere have their uses as well, but part of being a good MWer is knowing the fights, knowing what the damage patterns are, and changing talents & glyphs to match.
As Reglitch said, though, you're failing on some rather basic points that should be taken care of before you worry about the difference in healing styles between 10man and 25man. Reforging to a proper haste breakpoint is the most important thing. Enchanting your gear if you're at all serious about clearing content is a no-brainer. Enchants are the cheapest, materials-wise, this expansion as they've ever been in the history of WoW - even if you're planning on replacing a piece soon, there's no reason not to enchant things. And for gods' sakes, spec Chi Brew instead of Power Strikes, and drop Life Cocoon and Mana Tea glyphs for Enduring Healing Sphere & ReM.