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Zvc403 capabilities. Will this work?

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Hello all, let me give my gratitude to you before I start for taking the time to read and help me out. I've tried to find the answers on my own but couldn't find anything clear enough....

*Background can skip*
I own a 3 family home that has 3 zones(1 for each family/story). Unfortunately, a previous plumber removed the zone valves and zone control board and the whole building is now being heated by one thermostat although each family has a seperate thermostat and seperate piping. 
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My old b and g nfi100 circulator seems to finally be on its way out and I figured while I'm replacing the pump(going with a taco 0010) I might as well reinstall the zone valves and zone control board. I'm looking into getting the taco zvc403-4 control board paired with taco 571 zone valves and three ecobee lite thermostats... Here is where I ran into speed bumps in my research. (Suggestions welcomed)

The zvc403 comes with a transformer capable of 40va according to taco documentation..which is ~1.9amps. each zone valve uses .9 amps... This already seems to be over the threshold without the thermostats.... Why would they sell a control board for 3 zones if it's not capable of of powering 3 zone valves... I might be misunderstanding. If someone can explain if this would work and how I wouldn't greatly appreciate it.. I'm figuring I need to add another transformer to get to 80va or go with a bigger control board although I'm only using 3 zones..

Thank you again



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