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Adding a secondary pump to my radiant heating system
3/8 " tubing. 1000 feet of runs. 6 loops ranging from 140 feet to 180 feet. GPM flow average about .65 gpm per loop. My pump is after the mixing valve. Trying to get more flow through each loop. Have balancing valves to slow water flow if need be. The thermostat signal (24 volt) is sent to a control board which in turn starts the pump (120 volts) and the isolated switch turns on the boiler on same board. So here is the question:
Can I add another small pump right before the boiler? Can I hook up a second pump to the board? So both pumps will turn on at the same time. Will adding a second pump damage anything or even help out with the actual flow? I can post pictures if necessary, etc.