So I believe it's working. Water is lazy, it will take the oath of least resistance. I do get heat in all of my old radiators, just not in the Pex (which is half-inch, compared to 1-inch lines for the rest of the house, so that could be a factor as well). But also old pumps sometimes wear the impeller down by friction with small dirt particles especially in an iron radiator system that sheds these particles. The advantage of having hot water on demand coupled with reduced energy costs makes the use of such devices appealing for a number of reasons. We use cookies to enhance your experience. I recently replaced some of my cast-iron radiators with underfloor Pex heating and am having trouble getting flow through the Pex (yes, I bled the lines thoroughly). Did your service man check to get air out on the second story and make sure the feed value is putting water into the system so you can get enough pressure to get air out and make the upper story work. Remember to also … As long as the central heating system is properly installed and maintained, you can expect the pump to last for a long time. However, this system does have its drawbacks. In either case, the motor is usually connected to the water valve via a mechanical coupling. I also understand kettling sounds that I’m hearing could be in some part related to a failing pump (not … Pump impellers do ware out and the water will just bipass internally. The pump runs on 120 VAC power and plugs into a standard outlet. A circulator pump or circulating pump is a specific type of pump used to circulate gases, liquids, or slurries in a closed circuit. I recently replaced some of my cast-iron radiators with underfloor Pex heating and am having trouble getting flow through the Pex (yes, I bled the lines thoroughly). Is there a mixing valve serving the PEX? Cookies help us deliver our Services. It doesn't sound like you are done yet. From my reading, it seems difficult to evaluate whether a pump is operating properly, but it also seems like 22 years is a very long lifetime for a pump. Hot Water Circulation and Hot Water Recirculation . Circulator pumps are small in size, making them harder to repair on your own. Is the system zoned? By using our Services or clicking I agree, you agree to our use of cookies. I have a hot-water boiler that was installed in 1942, and a circulator pump next to it that looks like it is of the same vintage. Check yours in fall to be sure it remains in good working order. Then the high velocity fluid is converted into high pressure fluid in the diffusion portion of the pump casing. I like to say that even if a pump fails it does not mean that a better pump exists. When you installed the PEX, what other modifications were made? A hot water circulation system / closed-loop system uses a dedicated hot water pipe which loops throughout the home beginning and ending at the water heater. It’s much more common to replace a … I've seen them last only a few years, and I've seen them last 20 years, and I wish I knew the secret to a long life, but it seems random. There’s just one circulator? There is no information on it. Submersible pumps, which are found in the last 8 to 10 years before they have to be replaced, however, many well pumps serving houses with moderate water use can last up to 15 years. If you get more than 30-years out of your central heating pump, then you have done extremely well (Give your central heating pump a pat on the back). Our virtual experts can diagnose your issue (for free!) There is to much resistance in the 1/2 pex so it doesn’t flow through it very well. I don't know the pump's model number or manufacturer. As long as the central heating system is properly installed and maintained, you can expect the pump to last a long time. The power of the pump is enough to cause the water to travel right back up to the boiler from the pipework.