Thermonuclear cell is the second of nuclear heaters and it continues the trend. Hotter and more expensive then previous one. Switch up to it if Nuclear Cell just can`t give enough heat to keep your grid busy.
Total heat: 50000000*800=40000000000
Profit: 20 G.
Water cooling is a new mechanic particularly suited for high-heat builds, allowing a single generator to increase the amount of processed heat by a significant margin. For example, completely unupgraded Generator 2 can process 9 heat per tick. Same generator can hold up to 5000 of water, which allows the processing of 500000 heat. As the upgrades for the generator roll in, the advantage ceases to be so humongous, but nonetheless remains a considerable contribution to power generation.