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.....
Symptoms & Signs. Pain in the heel can result from a number of factors. Abnormalities of the skin, nerves, bones, blood vessels, and soft tissues of the heel can all result in pain. Because of walking and daily movement, we are always at risk for injury or trauma to the heel area. Common causes of pain in the heel include blisters and corns. Plantar fasciitis, inflammation of the bowstring-like tissue in the sole of the foot stretching from the heel to the front of the foot, is one condition commonly associated with heel pain.
Heel pain can have many causes. If your heel hurts, see your primary care doctor or orthopaedic foot and ankle specialist right away to determine why and get treatment. Tell him or her exactly where you have pain and how long you've had it.