How is the water returned from a zone to the boiler

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Reference no: EM131375828

1. How is the water returned from a zone to the boiler

2 How does a motorized zone control valve work? 18. What are mixing valves used for?

3. Why might mixing valves be used for radiant floor heating? 20. How does a radiant floor heating system transfer heat?

4. How does an open piping system differ from a closed-type piping system?

Reference no: EM131375828

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