Ok my wet bay (Both fresh and waste) is heated by the furnace which I don't use
So I have a string of C-9 Christmas Tree Lights. 30 lights each 9 watts (these are the old outdoor lights look like the more common C7 (Night light size) but bigger) note DO NOT go to 15 watt lamps they will melt plastic the C9s do not.
I have a 100 watt rough service lamp on the end of the string in the waste compartment this is caged. I have a 150 watt "World's smallest space heater" if it gets real cold.. at 11 degrees (Outside) the cold water pipe froze.. Middle of the run (Pex does not mind that) next AM when it got up to about 22 it thawed and I could flush the toilet normally again. hot did nto freeze.
