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Hi, does anyone have any thoughts on what kind of control I can use to shut my system off except when it is approaching freezing? On my new ModCon Alpine I can do this with warm weather shut down but this is for an older Slantfin Concept 21 with 3 zones in a different house. The house is unoccupied and I am looking for a simple inexpensive way to cut back on fuel use. I do not want to get into draining the entire plumbing system and putting antifreeze in the boiler. I am looking to leave the thermostats set at 50 degrees and have the system only go on if the outside temperature were to go below 35 degrees or so. Thanks.