Inclusion Criteria:

• Adults >18 years
• Diagnosis of heart failure (any aetiology or left ventricular ejection fraction classification), any timeframe
• Currently prescribed ≥40 mg/day of furosemide (or equivalent loop diuretic) for at least one month.
• Heart failure hospital admission and moderate or severe leg oedema in the previous 12 months.
• Lives in the UK, with a home environment suitable for installation of the Heartfelt device.

Exclusion Criteria:

• Amputation of both feet
• Bed-bound for more than 20h per 24h period
• Bandages to lower limbs every day
• Regular wheelchair user inside their home
• No fixed abode
• Participation in another interventional trial that may interfere with endpoints
• Life expectancy <6 months, in the opinion of the investigator
• Inability to provide informed consent due to cognitive impairment
• Language barriers that preclude understanding of trial procedures (unless translation resources are available in relevant language)
• Inability to install the device (even with assistance) allowing at least 6 months of data capture by the end of the study.
• Patients with severe aortic stenosis or awaiting a heart procedure or surgery
• Patient with end stage renal disease (eGFR <20)
• Pregnancy or lack of contraceptive measures if of child-bearing potential