[BUG] Large Boiler temperature wiggle

[galyfray]

Describe the bug The current implementation of the Large boilers make them cooling and heating again all the time which is frustrating and reduce the effective steam output why the boiler doesn't just keep at max temp when possible ?

Setup Playing Both New world generated yes

Steps To Reproduce

1. build a large boiler any of them
2. make it warm up to max temp
3. see it periodically decrease and increase his temparature

Expected behavior keeping itself at max temperature

Additional context the temparature change is used to consume fuel but the consumption can be done in an other way really easily