A hot water unit equipped with a hot water re-circulating pump will maintain a more consistent level of heated water to be used through their home. There are always dangers and mishaps that can occur when one is modifying a hot water system, so take precautions when installing your re-circulating pump.
Here is how you install a circulator pump:
Spread your tools out in a safe place so that you can see everything. Also take the new circulator pump, flanges, gaskets and bolts out of the boxes and bags they came packaged in.
Now that you have your tools ready you will want to isolate the area where the pump is being installed. What this means is that you will want to “valve off” the area. If you are just replacing a circulator then you should have isolation valves on each side of the flange. If this is a brand new install it might require you to shut down a system or a line that is being feed by a main.