In the base-case example of Figure , the mass flowrate which minimizes cost for the genGEO water case (Figure ) is approximately 100 kg/s, and much higher than 40 kg/s. Thus, we can assume the effects of wellbore heat loss are negligible. However, in cases of low transmissivity or pipe diameter, a lower mass flowrate which minimizes cost is expected and the inclusion of wellbore heat loss may be important.