Guide: How to change your Circulation Pump

Are you having problems with your circulation pump and have decided to replace it? We have put together a step-by-step guide so that you, as a customer, can feel secure in carrying out your exchange.

ATTENTION! Before you start, it is important that you have turned off both the electricity and the water, and for your own safety, we also want to point out the importance that you, who carry out the replacement, have authorization to handle the electricity.

All installations are not done in exactly the same way, but to a large extent. There are many manufacturers of circulation pumps, some of the largest are for example: Grundfors and Wilo.

Estimated time required: 1h

This is what you need: 2 pipe pliers, Phillips screwdriver, wire cutters.

Step 1:

First, you need to start by locating where your current circulation pump is located.

If there are shut-off valves, there is no need to drain,

Step 2:

Once you've located the circulation pump, it's a good idea to inspect it before disassembling it. If you haven't already bought a new replacement part, it's a good idea to measure the existing circulation pump carefully, note the brand and the settings. Note if the old circulator is standard size or not, another tip is to take photos of the electrical wiring and connectors so you know how to hook up the new model.

Step 3:

As we mentioned at the beginning but which bears mentioning again, it is very important that you turn off the power before starting your change. You should never change a circulation pump while the power is on because it is powered by electricity. Turning off the power is easy and is done in your property's electrical control panel or fuse box.

Step 4:

After making sure that the power is off, the next step is to close the shut-off valves (if any) on the circulation pump, to stop the water supply to it. You close the valves either by hand or with a wrench. If the old circulation pump does not have shut-off valves, you must first drain the heating system of water before you can detach the circulation pump.

Step 5:

When the valves are closed or when the heating system is drained, it is time to loosen the nuts that hold the circulation pump in place. Turn the nuts counterclockwise and then remove the old pump. Note how the electrical cables are connected, there should be a brown, blue and yellow/green cable.

Step 6:

Replace the existing gaskets (2 pcs, one at each connection) with new ones, then put the new circulation pump in place and check that it closes tightly. Here you can perform a simple quick test to see if there are leaks, you do this by opening the valves. If necessary, top up the pressure.

Step 7:

Now you have to connect the circulation pump again, a tip is to look at the photos you took in step 2. Connect the electricity in the same way you disconnected it. If the circulation pump has become wet, it is very important that it is dry, be sure to wipe it thoroughly.

Step 8:

Turn on the power and start your heating system by turning the thermostat. Once the heating system is up and running, it's a good idea to check for water leaks or drips from the new expansion tank.