caterpillar
New Member
I have a NFC combi boiler that I added a Grundfos UPS15-58 FC external recirculation pump. I have 3/4 pex with a designated return line that runs about 45' one way and 45' back. Im activating the pump with a smart plug and an app controller. When I turn on the pump should the combi boiler start making hot water and recirculate it until it reaches the set temperature? When I start the pump it will not start making any hot water until I open a faucet. Is there a setting that needs to be set in order for the boiler to start making hot water when the pump comes on without a faucet being opened? Here is how it is plumbed. Thanks.
