As a 29 warden i got 3 blast heals, but im not using the arch healing apprentice 1 anymore.
One of them heals for 500+ but it's adept 1 quality.
The other heals for 394 i think.
The trick is to use your other defensive spells - such as for the druid types - Heal over Times. I got two different regens and they stack so i can use them both.
Regrowth heals for 79 every 4th second but doesnt last very long, 20 seconds or something.
Blessing of the groove heals for 60 every 3.3 seconds and lasts for alot longer, i belive around 40 seconds.
I also got a group heal which heals for around 290 to all group instantly, and a group Heal over time which heals for 35 every 2.0 seconds i belive. These has a recast time of about 30 seconds, while the single target heals recast is below 10 seconds.
In a fight i start with casting both my heal over times, then i direct heal (blast heal) when the tanks health drops to about half, as blast heals draws alot of hate towards you if you use them to much.