Was 820 or something, now I am 860 and healed all up to 6 without no issue as Disc. I should of probably mentioned that it was due to item level. I guess on low item level your save bet is Holy, although proved to be possible even at low level as disc.
I love the new disc actually, I am finding myself stuck on beta, regretting I did not play it from Alpha even tho i had the chance. Especially in Mythic+ dungs it goes really good with disc. I can push as much DPS as many other proper dps, while I still hit amazing healing.
Last expansion I had hard time rerolling to holy to disc, but these days I am really looking forward to maining disc instead of holy, it is awesome