Non-electric or thermostatic zone valves will adjust water flow based on room temperature and can be dialed up or down.
http://www.spartan-pd.com/PDFfiles/Zone%20Valves%20OT1100%202100%205100.pdf
Read this suggestion as well:
http://www.heatpro.us/designtree/documents/tanklesssys.htm
Seems the tankless or small boiler would be used mostly for the inspection while the soapstone firepots would be the main source.
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