By my calculation, raising 1.5 gallons of water 60 degrees F uses about 190 Calories.
That's not huge, but I suppose over time it would add up--provided you did not change the amount you eat to compensate.
Anybody want to check my arithmetic?
1 Calorie = 1000 calories
1 degree C = 1.8 degrees F
1 gallon (water) = 8.33 lb
1 lb = 454 gm
190 calories/day x 365 days = 69,350 calories = 19.81 pounds @ 3,500 calories/pound. Sounds pretty huge to me for doing nothing other than drinking cold water.