how much heat is required to warm 1500 gallons of water from 70 to 140 degrees F?

Answer 1

heat= mass*sepcificheat capcity*changetemp

I don't know if you can find the specific heat capacity for water in SAE units. So here it is :

specific heat capacity water= 1BTU./lb-degF

now convert 1500 gallons water to lbs...That depends on temperature, so take the starting temperature 70F, compute mass, it wont change

http://www.engineeringtoolbox.com/water-density-specific-weight-d_595.html