Why isn't orthoboric acid soluble in cold water even though it has polar B-OH bonds?

This is the information I found regarding orthoboric acid's solubility:


1. Textbook (NCERT India): Sparingly soluble in water (didn't say what temperature - presumably cold) and highly soluble in hot water.
2. [Wikipedia](https://en.wikipedia.org/wiki/Boric_acid): "Boric acid is soluble in boiling water."


**My question:** why is it only sparingly soluble in cold water even though it has polar $\ce{B-OH}$ bonds? Also, what happens on increasing the temperature that increases the solubility?


