Originally Posted by Amoenitas
The HoT from the glyph of Prayer of Healing does not stack. It simply overwrites the old one.
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It should be worth noting that the tick duration is maintained when the HoT is re-applied, so chain-casting PoH will result in 1 tick every 3 seconds (I will test later if haste effects the tick duration). A weaker PoH HoT can over-write a stronger one, although there seems to be some fudge going on when the heal lands at the same time as a tick.
On a separate note, to clarify this I did some testing and it would appear that Glyph of PoH benefits separately from Twin Disciplines, resulting in a double benefit of the effect (first on the PoH, then again on the glyph).
My PoH healed for 7017 after TD, and the HoT healed for 743/744
7017/10*1.06=743.8
So with TD glyph of PoH is actually giving 10.6% additional PoH healing per tick.
I tested Grace for this effect too but it seems only TD gives it.