Casting a GHW and a TC LB to offset the additional mana cost of GHW over HW is actually higher HPS and HPM than just casting multiple HWs. HW simply heals for too little to be as effective, not to mention that it can only be justified on targets that are near maximum health, and therefore tends to receive very little benefit from Mastery.Throw in that HW spam unnecessarily eats up Tidal Waves stacks, making it less likely that you'll have one available when you "need" it for a key GHW, and HW spam is just sub-optimal in every possible aspect.To demonstrate it let's use a simple, yet accurate, example. We'll assume 0 haste, just to have even numbers, and since all of the spells scale the same with haste and it therefore wouldn't change the result.
Imagine if you had to heal, say, 30k healing.
It would take you 3 HW casts to accomplish that. That's 7.5 seconds.
Or, you could cast 1 GHW to heal it completely, leaving you 5.0 seconds to cast 2 TC+LBs.
Speaking from my own gear and logs, I return over 3k mana per LB after deducting the mana cost of LB. Let's round down and say that I spend that 5 seconds casting 2 LBs returning 6k mana.
Cost of using HWs: 3 x 1981 = 5943
Cost of using GHW: 7267 - 6000 = 1267
Alternatively, let's say you decided instead to use 1xGHW to heal the damage and only cast 1xLB instead of two:
Cost of GHW: 7267 - 3000 = 4267
You'd still effectively save nearly 1700 mana by using GHW/LB isntead of HWs, but you've also upped your HPS significantly by being ready for the next heal in 5 second instead of 7.5 seconds that it would have taken to cast your HWs.
This example doesn't use Tidal Waves, for simplicity sake, but it is my opinion that TW actually makes it MORE in favor of GHW over HW, as HW spam consumes all TW procs and reduces the likelihood that you'll have them available for when heavier damage sets in and you need the urgency of a TW'd GHW.In every possible way, in any gear greater than leveling blues, using HW is highly inferior to using GHW and supplementing with TC regeneration.
The only times I would recommend using HW to a modern raider are:
You're at full mana and would rather waste Tidal Waves instead of contributing to DPS with LB
(Hint: don't do this, helping DPS with LB is more valuable than mindless overhealing)
You're intentionally using HW to keep Ancestral Vigor up on a target that's about to expire, and Riptide and Unleash Elements are on CD. (This actually can happen, but is generally rare)