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Context: My furnace supplies tank-less domestic hot water to my small house. The cold water pipe going into the furnace has a "flow control" component that limits the flow to 3gpm. I understand that higher flow rates could result in my domestic hot water not being fully heated before it gets to a faucet because it went through the furnace too quickly.

Problem: This "Flow Control" component has failed (from age), and only allows a small trickle of water though. (I am certain it is this component because I have way to vent water from either side of it.)

Question: Since water flow is limited by my faucets and shower anyways, can I just remove the component instead of replacing it.

  • You'll know when you try. It depends on 1) supply pressure, and 2) actual flow rate due to local demand. We can't really say. I'd give it a go. – isherwood Jan 25 at 16:20
  • If it was also a pressure regulator, I'd worry about the full supply pressure damaging the furnace, but assuming that's not the case you probably don't need it. You just won't have very hot water if you turn on two faucets at the same time (most single faucets and showers are less than 3gpm anyway). – JPhi1618 Jan 25 at 22:02
  • I removed the flow control device and discovered that it had failed from debris stuck in it. Everything works fine without it. – pants May 21 at 19:32

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