A handle to one active Create boiler and its current Fluid Tank controller.
Create's heat gauge before water and tank-size limits. Passive heat reports one.
Whether Create currently treats the boiler as passively heated.
Effective active boiler level, from zero through 18. Passive heat reports zero.
Water contribution to the boiler level, from zero through 18.
Create's sampled water input rate, in millibuckets per tick.