Boilers - Zoning with pumps or valves EXPLAINED
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There are more than one way to skin a cat. In fact, ask ten people and you will get eleven answers.
The simple explanation.
Zoning with pumps gives you one pump per zone. Bet you knew that already, didnt you?!
Pros: Redundancy, precise control of flow.
Cons: electrical cost, more moving wheels on the bus to break, larger near boiler piping to prevent NPSH
Zoning with zone valves leaves you with a central pump and zone valves (motorized valves) that open and close when each zone calls for heat.
Pros: Less electrical draw, smaller near boiler piping, easy replacement when zone valve breaks, easily bypass a non working zone valve.
Cons: Not as redundant (one system pump), not as precise flow, replacement of full valve requores draining system.