Jason,
For whatever reason, simple solar boilers are running 24/7 on our server. Most people are saying it is a bug/op and that they should be running only 20% of the day like the wikis suggest (1.2l/t average).
Currently they are equivalent to simple coal boilers that require no fuel (6l/t).
I actually think running all day while not realistic helps to balance the fact that people usually sleep in single player or on smaller servers to keep the solars running but yeah, figured I better report it.
You said both 24/7 and all day I'm kinda confused whether you mean during the day or during the day and night.