My resto shaman with ~2400sp raid buffed sees it tick for around 400-500, ele shamans w/ 1800sp see 300-400, but remember a tick is every few (3?) seconds, not every second. So I'd guess you'll see upwards of 2500-3500 hp/tick or so, which is excellent background AoE healing but not enough to really do any heroics, since bosses and some trash packs hit 30k armor plate wearers for 6-10k+ a swing.