A non steroid hormone from heart to regulate the kidney function is
ANP
The atrial wall of our heart secretes atrial natriuretic factor (ANF), when the blood volume and pressure in the atria increases. Also called as ANP ("P" is for "peptide" ), it is a powerful vasodilator. It contributes to homeostatic control of water in the body and also helps control of levels of sodium, potassium (to control electrolyte homeostasis) and helps to reduce blood pressure and regulates reabsorption process in the kidneys.