The density of water at 20 deg C (and at a pressure of 1 atmosphere) is 0.99820 so the mass is 250*0.99820 = 249.55 grams.
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Approximately 6g. The density of pure water at 20 degrees centigrade and standard atmospheric pressure is 1 g/ml. The answer is approximate since the water may not be chemically pure and you do not give a temperature or pressure.
20 degrees Fahrenheit is colder.
20% of 250 is 50
q(joules) = mass * specific heat * change in temperature ( 8 kg = 8000 grams ) q = (8000 grams H2O)(4.180 J/gC)(70o C - 20o C) = 1.7 X 106 joules ============
8.200 J