I have two improvements I would love to see:
- The steam generator mechanics are terrible. It requires an exact amount of heat that only matches up with a fully populated liquid heat exchanger to produce steam, otherwise it spits out water, relying on a fluid regulator to keep it flowing. It should instead have internal water storage and take whatever amount of heat you give it and generate as much, and only as much steam as it can from that heat.
- The liquid heat exchanger should be reversible, allowing you to create hot coolant from non nuclear heat sources.
These two changes would allow some much more interesting mechanics:
- You could run a steam turbine from 1-5 heaters attached directly
- You could have a farm of heaters generating hot coolant to concentrate and transfer the heat into the steam generator
- It actually gives a use to the radioisotope heat generator, which can participate in your heating plant