Inclusion Criteria:  Patients diagnosed heart failure Patients taking loop diuretics for HF symptom control Patients who can use a smart-phone  Exclusion Criteria:  Patients with implanted devices that could interfere with the BIA such as ICD and CRT Patients with limb defects Patients who unable to stand alone Patients who are pregnant Patients with End-stage renal disease (ESRD) on hemodialysis, serum creatinine of more than 5mg/dL, or nephritic syndrome Patients with systemic diseases such as hypothyroidism, decompensated liver cirrhosis, and systemic lupus erythematosus. Patients with active cellulitis, severe varicose vein, deep vein thrombosis or lymphedema