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Lesser Healing Wave: which rank to use

Shaman · Nature · 6 ranks, 2 learned by level 30.

At level 30 with 45 healing power, Lesser Healing Wave rank 1 gets the most healing per mana; rank 2 does the most healing per second.

Most mana-efficient rank by gear: rank 2 up to 31, rank 1 from 32 healing power.

Every rank at level 30 with 45 healing power

Rank	Healing per cast	Mana	Cast	Healing per mana	HPS	Mana lasts
Rank 1 (level 20)	181 (170–192)	105	1.5 s	1.72	120.5	21 s
Rank 2 (level 28)	248 (233–262)	145	1.5 s	1.71	165	16 s

HPS counts the global cooldown. Mana lasts: casting only that rank from 1,500 mana.

Rank 1: 181 healing for 105 mana in Forever instead of 202 for 105 in Classic Era (spell power share 0.429 instead of 0.429).
Rank 2: 248 healing for 145 mana in Forever instead of 288 for 145 in Classic Era (spell power share 0.429 instead of 0.429).

From the client, for each rank: base damage or healing and its range (SpellEffect base points and variance), the extra per level up to the rank's max level, the spell power share (coefficient), mana cost, cast time, duration, global cooldown and cooldown.
No downrank penalty in the Forever client. Classic Era's client puts a penalty for spells learned before level 20 inside the coefficient (Shadow Bolt rank 1: 0.14); Forever's client gives the full share (0.486), for 80 low-level ranks across the classes. Anything else would be on Blizzard's servers, so the calculator shows Classic's rules only as Speculation.
Speculation: crits count only on direct hits, at 150%, as in Classic; the example gear (1.5 spell power per level) is not client data.