I guess this would 16000 gals x 7.6lbs/gal x 30deg = 3,468,000 btu need if I was going to raise the temp 30 degs but I guess that would also need some time of time element in the calculation also. Let me go check my pump model and with gal/min I should be able to come up with a btu/hr I'd need. I may need to see just what the flow rate is to the house is also to see if there is any excess capacity.