As a standard immersion heater is 3KW, so it would take 2 hours to heat 100 Litres of water. After an hour and a half, it will only have reached about 53 degrees.....
Podiatrists cite Plantar Fasciitis as being the most common cause of heel pain. Typical symptoms of this condition include sensations of pain, burning or heat in one or both heels.
Heel pain is not usually caused by a single injury, such as a twist or fall, but rather the result of repetitive stress and pounding of the heel. Common causes of heel pain include: A heel pain sufferer commonly feels pain either under the heel (plantar fasciitis) or just behind it (Achilles tendinitis).