Ok I think I got it now, does this diagram look like it will work.
"And again, you could do it with one mixing valve, one pump, and two zone valves." The thermostatic mixing valve basically is a rectangular block with 2 inlets going into one side of the valve and exiting with 2 outlets coming out directly on the opposite side of the valve evidently with a preset temp built in no bypass leg. There is no name, number or model on the valve, it was part of the package from central boiler dealer. Would you use such a valve. Could you show me a diagram with one mixing valve, one pump and 2 zone valves.
Thanks again, Tim
I'm not sure what you mean by this statement, yes there is a chemical additive with a test kit. The boiler water is going thru a sidearm tube within a tube for the hot water tank, furnace is water to air exchanger, it won't cross with potable water.You shouldn't really pump the same water that's in your boiler, through all of your house system.