Im hoping someone can help. We just purchased a home with a tankless water heater (natural gas) and the water takes a long time to get hot. There is an Grundfos Alpha1 circulator pump that ties into the hot water line next to the water heater in the crawlspace but it isnt plugged in. Could this be the source of the problem? Our last home had a tankless hot water heater powered by natural gas but I wasnt aware that we had a circulator pump in that home. Anyone who could shed light on how this system is setup to operate would be greatly appreciated.