Now, when it comes to heating the house, some folks might not think much about it, but let me tell ya, a circulator pump is real important if you got radiant floor heating. This little pump, it moves the hot water around, making sure the whole floor heats up nice and even. Without it, well, you ain’t gonna get much heat in your floors, and that ain’t no good when it’s cold out.
What’s a Circulator Pump?

So, what is this circulator pump, you ask? Well, it’s a simple thing, really. It’s like a little motor that pushes the hot water from your boiler through pipes that are under the floor. The hot water goes in, heats up the floor, then comes back to the boiler to heat up again. It just keeps going in circles, see? That’s why they call it a circulator pump.
Now, if you got radiant floor heating, you gotta have one of these. Why? Well, it’s because this type of heating works by heating the floor itself, and that heat comes from the hot water flowing under the floor. No water movin’, no heat.
How Does It Work?
The pump, it works by pushing water around in a loop. The boiler heats up the water, the pump sends it under the floor, and then the water comes back to the boiler to heat up again. Simple, right? But it’s gotta be the right size pump, or else you might end up with problems. If the pump’s too small, it won’t push enough water. If it’s too big, it’ll waste energy. So, you gotta get one that matches your system just right.
Choosing the Right Size
Now, here’s where things get a bit tricky. You see, most radiant floor heating systems use a 20-degree temperature drop, which means the water comes back to the boiler about 20 degrees cooler than when it left. That’s normal. But because of that, you need a pump that can handle it. The formula folks use is something like this: 1 gallon per minute (GPM) for every 10,000 BTU/hr. So, if your system needs to put out 30,000 BTUs, you need a pump that can push 3 GPM. Simple math, but it’s important to get it right.

Best Circulator Pumps for Radiant Floor Heating
Now, let’s talk about some of the best circulator pumps out there. There’s a few that folks use a lot for radiant floor heating. One popular one is the Grundfos UPS Series. This one’s a real good choice because it’s reliable and lasts a long time. Another good one is the Armstrong Astro Series. These are both strong pumps that’ll keep the water moving and keep your floors nice and warm.
But whichever pump you choose, make sure it fits your system. You can’t just grab any pump and expect it to work. You gotta match it with the size of your system, the length of the pipes, and how much heat you need.
Why It’s Great for Radiant Floor Heating
Now, you might be wondering, why’s this circulator pump so important for radiant floor heating? Well, let me tell ya, radiant heating is one of the best ways to heat a house. It heats the floor, and the heat rises up, making the whole room warm without blowing air around. And the lower the temperature the system runs at, the better it is for a heat pump, which means you save energy. The circulator pump keeps that water moving, and when the water’s moving, the floor stays warm. So, you really can’t have radiant floor heating without a good circulator pump.
Things to Watch Out For

There’s a few things you wanna keep in mind when dealing with circulator pumps. First off, make sure it’s installed right. If it ain’t hooked up properly, it might make noise or not work right. Second, keep an eye on it to make sure it’s running smoothly. Sometimes, air can get trapped in the system, and that’ll stop the water from moving. If you hear gurgling sounds, that might be the problem. Finally, check the pump every now and then to make sure it’s still working. These things last a while, but nothing lasts forever.
Conclusion
So, there you have it. A circulator pump is a small but mighty part of your radiant floor heating system. It keeps the water moving, keeps your floor warm, and helps save energy. Whether you go with the Grundfos UPS or the Armstrong Astro, just make sure you get the right size pump for your system. And remember, if the water ain’t movin’, the heat ain’t comin’. So take care of that pump, and it’ll take care of you.
Tags:[radiant floor heating, circulator pump, Grundfos UPS, Armstrong Astro, hydronic heating]