I have been given the task of wiring a hot water boiler with 5 zone valves. the boiler has a low voltage wire comming out of the side of it. The electrician has already wired the 120v but I think he still needs to include the low water cut off after the service switch on the side of the unit. There is also another valve for hot water storage tank that is heated by the same boiler. From what I can understand here I need a transformer for the thermostates and valves and I can only put up to three valves on a transformer. Here is a picture of what i am talking about. any help would be greatly appreciated.
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