Cold Morning and Warm Water

It got really cold last night, down to 7, and I haven't checked the turnips and spinach in the cold frame, but from what I've seen this winter, I'm sure they're ok.
All the animals love warm water on a cold morning and they congregate around the bowls like office workers at the coffee

machine. I'm thinking that warming the water in the mornings helps my hens with egg production. It's just a theory, but I'm guessing the energy they'd be putting into warming themselves is put into making eggs, so I'll keep doing this all winter. I could be dead wrong too.