zone valves vs circulators?

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Old 01-27-14, 07:26 AM
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zone valves vs circulators?

what uses less energy, zone valves or circulators? 12 zone circulators or 12 zone valves with a differential bypass valve? do zone valves only take energy when switching to open or closed but take no energy when standing? also are there zone valves on the market that do not consume energy after switching?
 
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Old 01-27-14, 07:40 AM
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Circulators definitely consume more energy than a zone valve, especially when you can potentially run 12 of them, that's not even considering install costs. A zone valve can either be powered open (almost always the case in heating) or powered closed. Once powered they will consume power until power is removed.
 
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Old 01-27-14, 07:51 AM
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TWELVE ZONES? How big is the building? You talking residential?

Zone valves are going to consume less power, usually less than 10 watts a piece. There are some very expensive pumps made these days that are more efficient, but I don't think less than a zone valve.

Still, twelve zones... what happens when all of them call at the same time? Is your single pump and the boiler going to support the flow required?

do zone valves only take energy when switching to open or closed but take no energy when standing? also are there zone valves on the market that do not consume energy after switching?
Most consume power whenever they are open. It may not be the FULL power, and it may be intermittent (heat motor valves turn the are an example of 'intermittent' power draw).

White-Rodgers 1311 series of zone valves only consume power when they are either opening or closing. The drawback to these is that they require a special thermostat, one that uses THREE wires, and these thermostats are more expensive naturally... as are the valves themselves.
 
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Old 01-27-14, 11:18 PM
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Since TRVs thermostatic radiator valves essentially are zone valves... then those, with an ECM pump can't be beat!

And to echo... 12 zones in one envelope? I'd take the extra money on zone control and add to the insulation so that the whole space can be closer in temp.
 
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