Replacing a Boiler Circulator Pump: What to Do After

  • 5-10 hours
  • Advanced
  • 500-1,000
What You'll Need
Pipe cutter
Basic open ended wrenches
Basic pliers set
Electric pliers
Electrical caps
Black marker
Couple of buckets
Pump flanges
Bolts for the flanges
Fittings that plumbers use
"O" rings or gaskets that are needed for your flanges

If you have the need to replace a boiler circulator pump, you will find that this particular project should actually be pretty easy to do. There are all kinds of different manufacturers of this pumps and it is up to you whether or not you want the same brand that you are replacing or want a different one, this is entirely up to you. Whatever you decide, all of them will come with the hardware needed and specialized instructions if needed. Below you will find simple and generic instructions on how to replace your pump without having to call in a professional to do the work for you, which will save you a bundle of money.

Step 1 - Turn Off the Valve and Electricity

Now you want to do is valve off or shut off the valves where the pump is being replaced. Should this be a brand new installation, then you may need to make sure that all systems are shut down that are coming from the main line. Just make sure the line is not running when you decide to take off the old pump. Now shut off all electrical power to the pump before taking off the old pump. You can now safely remove all wires that happen to be attached to the actual motor. Then cap the ends with electrical caps.

Step 2 - Remove the Pump

Figure out where this new pump is going to be located. Where in the line is it actually going to be? Once you have that figured out make sure to mark the pipe with the marker where it is going to be cut. Now remove the bolts to the flanges and remove the circulator pump. Note that some water may come out when you remove the flanges and pump, but that is to be expected. You should have someone there to collect the water with buckets because you don’t need to be standing in a puddle of water when working.

Step 3 - Start Installing the Pump

Measure the height of your pump with the flanges on the pump. Cut the pipe where the new pump is going. Remove the flanges when you are ready to start installing the pump. Put the flanges on the pipe and then place the pump in between the flanges. Note to remember that you have your flow going the right direction. Make sure you do not forget to put your "O" rings on or gaskets, depending upon what brand you bought.

Step 4 - Tighten the Bolts

Put the flange bolts on and tighten them evenly on all sides. This is to make sure that your flanges are not installed crookedly. If you do not tighten the bolts correctly this might make the flanges leak.

Step 5 - Finish and Test the Pump

After all of this is done, you are ready to hook the electric back up to the pump. When your pump is properly tightened and properly rewired it is now time to the water back on. Once the water is turned back on it is time to turn the pump on to test whether or not you installed your pump correctly.