Chronic heart failure (CHF) is a progressive, complex, clinical syndrome resultingfrom structural and/or functional cardiac disorders that impair systolic and/or diastolicventricular function. The debut of CHF can be acute with severe signs and symptoms,such as pulmonary rales and shortness of breath, but often the symptoms developgradually with various degrees of, for example, fatigue, dyspnoea and peripheral oedema 1, 2. Naturally, this affects the individual’s health both physically and mentally 3,4. Lack of energy and fatigue are often described as limiting and this affects the lifesituation in many different ways 5-7. The prognosis of CHF is generally poor, approximately 60% of the patients die within five years after diagnosis 8. The goals oftreatment are prevention, delaying disease progression, improving quality of life andprolonging survival. The treatment for CHF is both pharmacological and nonpharmacological and it is complex. In order to successfully adhere to the treatmentand to perform self-care the patients need knowledge and skills. Different kinds ofCHF programmes, with a variety of educational intensity have been developed, withthe goal to improve self-care and adherence to treatment and, thereby, to improvequality of life and reduce morbidity and mortality 9-11.Nurses involved in the care of patients with CHF often meet patients that complainabout thirst. The reasons for thirst can be several: (1) increased activation of the neurohormonal systems stimulates the thirst centre in the hypothalamus, (2) xerostomiainduced by diuretic therapy intensifies sense of thirst and (3) and recommendation restrict fluid intake can increase the perceived thirst. Many patients with CHF are advised restrict fluid intake because of the risk of fluid overload. The recommendationsgiven in guidelines are 1.5-2L/day 12-14 but this recommendation has no support in thescientific literature. Formerly, when the pharmacological treatment not was as effective as today fluid restriction was a natural prescription.