Do you have a thermometer you could stick in the bay and check first thing in the AM to check what you are really dealing with.
Also, is the electric water heater in the same bay as all the other water stuff? It may well be giving off enough heat to help out with those very moderate nightly freezes. The bus, and water tanks, etc is a large mass that is well above freezing for most of the day. All that mass is a heat sump that helps out in the wee hours.
I don't think you have anything to worry about if the temps are as you described.
I would think if you really don't have an electric heater in that bay that it would be a fairly easy addition to do so.
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