The waste heat of a reactor, plus its electrical power output, should equal the thermal power output - P_th=P_el+P_waste. However, it seems that in CoaDE, reactors are instead outputting the thermal power as waste heat - without regards to the fact that quite a bit of that thermal power is being turned into electricity.
This 62.5 MW reactor would have, at 22.5% efficiency, a thermal power of 62.5 MW/0.225=278 MW. The waste heat should be 62.5 MW/0.225-62.5 MW=215 MW.
This appears to affect all reactors. For example, the stock 13.5 MW reactor, at 13.5 MW electrical power and an efficiency of 21.5%, should have a thermal power of 63.8 MW and a waste heat of 49.3 MW – but it has a waste heat of 63.8 MW. In consequence, the waste heat of all reactors is too high by a factor of 1/(1-η), where η is the reactor's efficiency.