As a hydronic design engineer, for residential systems I ALWAYS zone with pumps.
In the past circulators use to cost more than zone valves, but that is simply not the case anymore. Manufactures like Grundfos, Taco, Bell & Gossett, etc all make cartridge circulators that should fit your application (pump sizing still needs to be performed however). You can buy a zone circulator for around $80 and a zone valve of any decent quality is going to run you in the neighborhood of $70. Not to mention having multiple zones, if one pump does happen to go down, you still aren't dead in the water.
The second item is simplicity (pump zoning) - Thermostat calls, pump turns on, boiler starts. (Valve zoning) - Thermostat calls, valve actuates, end switch makes, pump starts, boiler starts.
The third pro in pump zoning is the simplicity of controls. You do not have to run extra wiring for zone valve end switches.
This is overly simplified, but I can honestly say I haven't designed or quoted a RESIDENTIAL job in years using zone valves...and there is a reason for that.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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