Determination function as a healer

[Sebazy]

IMO det's the second-best secondary for WHM, behind piety.

This, as whm I prefer det as it boosts your throughput regardless of what you are doing. Spell speed only improves your throughput when you are spamming at full speed. For spaced out casts it really doesn't offer much of a benefit beyond that heal landing a tenth of a second sooner.

[Viviza]

The more common school of thinking goes DET > SS > Crit for secondary stats.

Personally I see them as about equal.

SS is also good for chain casting, landing important heals faster, and pre-casting/cancelling heals more rapidly.

I think crit gets a bad rap. Crit is better for enhancing our hots, something SS doesn't fare so well at, and are a huge aid in recovering from big attacks. If my tank gets smashed while I'm in the middle of casting Cure I, a crit is helpful. Likewise for Cure 3 recovery from boss nukes.

[Slark]

Stats are subjective for WHM, get what you want. All of them give such small returns that they do not effect gameplay at all really. The biggest importance is just to have high ilvl gear so you can get as much MND as possible.

Want to be bursty? go crit.
Want mechanics to be slightly more forgiving? go SS.
Want to have more consistent HPS, and the highest number ceiling? go det.

That sounds alot more important than it really is, because all of them give roughly the same benefits, just in a slightly different manner, and when you gear for one of those three stats, you will get some of the other two somewhere down the line, which makes it even less extreme. Your playstyle won't change by going for one over the other two. Go for what seems fun.

[UlricCraft]

I'd typically just avoid crit WHM builds.
The aggro generated for overhealing is obscene and a massive concern for any WHM.
Consider your pain points playing WHM or SCH, then spec around those to either minimise the issues, or, be a boss and maximise healing potency.

Piety is my favourite statistic mainly because that SoS cooldown is horrid if you mistime it or require it for enmity removal.
Healing potency isn't a concern I've ever noticed. Det? No thanks.
SS is nothing important. All boss mechanic dps is either insta chunk, or 3-5 second CD. You pre-cast, or you spam cast which matches their speed.
Until a boss fires out AoE spells <2.5s, I won't be specing SS.

Crit SCH.
Pie WHM.

(IN MY OPINION)

[JonFarron]

I'm personally going for as much PIE as possible on my WHM. More MP and better MP regen is just better for my playstyle. I don't like to stand around idle in between heals, I'll toss out an Aero, or Stone II, heck sometimes Swiftcast Holy on adds. Sitting there waiting for MP just isn't fun, and with all this high piety armor I've focused on I don't have many mana issues. (usually finish a fight with 1-2k MP left)

[Kyana]

Maybe it's something similar to how primary and secondary stats worked in FFXI?

More MND will increase the ammount you can potentially heal for.
More determination won't increase the cap of the heal but will improve consistency.
And crit will increase the chance for a critical heal which is also influenced by determination.

For example:

normal heal: 500-600HP
normal heal with high determination: 550-600HP
critical heal: 900-1400HP
critical heal with high determination: 1200-1400HP

[AldoVonAlexandros]

I love crit on my sch, its great, i got once 2 crit heals with psy and eos at the same time, one did 2045 and eos like 917