Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn this reading yet so here's a mnemonic to help you:
What do you want to boil for dinner tonight? Walrus (わ). Boiled walrus is a delicacy where you're from, and the only way to be able to eat its yummy walrus flesh is to boil it for a long time until it's soft. Mmm smells good.
I’m waiting for the water to boil.