If solid, the product that needs to be heated can be placed directly into a liquid that is being heated (usually water).
(the product; needs; to be heated) (the product; to be; heated) (the product that needs to be heated; can be placed directly; into a liquid) (a liquid; is being heated; )
the product the product the product that needs to be heated a liquid
needs to be can be placed directly is being heated
to be heated
heated
into a liquid