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what is a recirculating pump for hot water

by Guiseppe Renner Published 3 years ago Updated 2 years ago
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A home water re-circulating pump is used to circulate domestic hot water so that any faucet or shower will provide hot water instantly upon demand. These systems slowly pump hot water through your hot water pipes and back to the water heater through either a dedicated line or through the cold water line.

Full Answer

How to install hot water recirculation pump?

INSTALL THE PUMP. With an adjustable wrench, disconnect the hot water discharge line coming out of your water heater. Insert a gasket into the female fitting on the recirculating pump and screw it onto the threads of the water heater discharge outlet. Use Teflon tape and tighten with a wrench.

What types of hot water recirculating systems are available?

Types of Water Recirculation Pumps

  • Dedicated Return Line Recirculating Pump. This type of recirculation pump is used on systems that have a dedicated return line. ...
  • Under-the-Sink Recirculating Pump. ...
  • Discharge Line Mount Recirculating Pump. ...
  • Tankless Water Heater Recirculation Pump. ...
  • On-Demand Recirculation Pumps. ...
  • Time-Activated Pumps. ...
  • Temperature-Activated Pumps. ...

What is a hot tub circulation pump?

Hot tub circulation pumps are low-flow pumps that constantly circulate in water as slowly as possible to provide your spa a continued filter, heat and chemically treated water. While these pumps are known to last 5-10 years, at some point your pump is going to see problems that need some instant attention— unless you enjoy non-chemically treated spawater, which we hope you don’t!

How do hot water recirculation pump work?

How Does A Recirculating Pump Work? In order to function, the hot water recirculation pump must use a mix of gravitational and mechanical energy. It accelerates the flow of hot water through the faucets while also forcing cold water through the boiler. These are the fixtures that may be found in the majority of luxurious settings such as ...

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What is the purpose of a hot water recirculating pump?

A hot water recirculating pump is installed on your water heater, returning unused hot water back to the water heater. It is designed to provide hot water on demand.

Is a hot water recirculating pump worth it?

With the average national cost of water rising rapidly, a hot water recirculation pump could easily save you upwards of $50 each year. Since these pumps cost between $200 and $250 each, you could pay back the investment within a couple of years.

Does a hot water recirculating pump run all the time?

While the system is capable of running continuously, it doesn't always do this. Most hot water recirculating pumps come with sensors or timers to regulate operation. Sensors can detect the temperature of the hot water in the pipe, only running the recirculation pump when the temperature drops below a specified level.

How does hot water recirculating work?

A hot water recirculation system is a plumbing system that moves hot water to fixtures quickly without waiting for the water to get hot. Rather than relying on low water pressure, common in most water lines, recirculating systems rapidly move water from a water heater to the fixtures.

How long do hot water recirculating pumps last?

How Long Do Recirculating Pumps Last? Most pumps – assuming you did not get a lemon – will last 10 to 15 years. The biggest factors that impact their life expectancy are the amount of water you use every day and the quality of the manufacturing.

How much does it cost to install a hot water recirculating pump?

It will cost from $500 to $1000 to install a recirculating pump if you hire a plumber. But of course, it can end up costing as low as zero dollars if you get an under sink recirculating pump and install it yourself.

Can I turn off my hot water recirculating pump?

Conclusion. As you can see, it's perfectly ok to turn off your hot water recirculating pump when you're not using it. In fact, it's an excellent idea to do so in order to prolong the lifetime of you pump and to save money.

Where should a recirculating pump be installed?

0:054:20How to Install a Hot Water Recirculating System - YouTubeYouTubeStart of suggested clipEnd of suggested clipThere's the hot water recirculating pump which will be installed onto the hot water discharge lineMoreThere's the hot water recirculating pump which will be installed onto the hot water discharge line of your water heater.

How do I know if my hot water recirculating pump is working?

Feel the Hot Water Heat Piping at the Circulator Pump: You can feel the pipe at the circulator pump - doesn't matter which side - in or out flow - since if the pump is running the pipe will get warm, then hot.

How do you recirculate hot water in a house?

0:394:25How to Get Hot Water with a Recirculating Pump - YouTubeYouTubeStart of suggested clipEnd of suggested clipBuilding you need to install a thing called a recirculation. Line now a recirculation. Line is aMoreBuilding you need to install a thing called a recirculation. Line now a recirculation. Line is a separate pipe that runs off the hot water line out at the farthest fixture.

How can I make my shower water faster?

How to Get Hot Water FasterInsulate the Pipes. If you think your water pipes are to blame for your hot water troubles, adding insulation might improve your situation. ... Hot Water Recirculation Pump. ... Replace Fixtures with a Higher Flow Rate. ... Upgrade to a Tankless Hot Water Heater. ... Routine Preventative Maintenance.

Does a tankless water heater need a circulation pump?

We love tankless water heaters because they are more energy efficient, you will never run out of hot water (when properly sized) and they take up less space. But in order to get hot water faster without wasting water down the drain you need a circulation system.

How often should recirculation pump run?

The most common circulator pumps run all day, every day, whether you're actively using hot water or not. This causes a lot of heat to dissipate in the pipes 24/7 and requires the water heater to work harder to keep the water hot.

Where should a recirculating pump be installed?

0:054:20How to Install a Hot Water Recirculating System - YouTubeYouTubeStart of suggested clipEnd of suggested clipThere's the hot water recirculating pump which will be installed onto the hot water discharge lineMoreThere's the hot water recirculating pump which will be installed onto the hot water discharge line of your water heater.

How much water will a recirculating water system recirculate?

Even the most energy inefficient recirculation systems save some water on every hot water use. The amount will vary with the length of your plumbing runs, but in our case, its as much as 2 gallons for each use.

Does a tankless water heater need a circulation pump?

We love tankless water heaters because they are more energy efficient, you will never run out of hot water (when properly sized) and they take up less space. But in order to get hot water faster without wasting water down the drain you need a circulation system.

The Problem Of Instant Hot Water

Every hot water faucet has a hot water pipe that travels from that faucet back to wherever your water heater is located in your home. In the North Dallas area where we work, the water heaters are mostly located in the garages and attics.

Dedicated Return Line Recirculation Pumps

There are two main categories of hot water recirculation pumps – dedicated return line pumps and retrofit crossover-style pumps.

Retrofit Recirculation Pump Systems

What if your house wasn’t installed with a dedicated recirculation return line? It would be a big project to go back and install a new hot water plumbing line in a house after everything has been covered up in sheetrock and trim.

Will a Recirculation Pump Save Money?

If you want to get ‘instant’ hot water or want to save water usage in your home, a recirculation pump is a great way to do that!

What Is Involved In Installing A Retrofit Recirculation Pump?

Installing a retrofit pump or replacing a dedicated return line pump are usually pretty straightforward jobs for a plumber. The biggest variable is the soundness of the pipes that the new parts will attach to.

What About Other Systems?

We covered the basics in this article, but if you are dealing with other types of systems (like with tankless water heaters) or more complicated setups (multiple hot water zones/loops) it can get more complicated.

Say goodbye to waiting for hot water. A hot water recirculating pump provides a warm shower on demand

When you turn on the tap, how long does it take to get hot water? Letting it run can waste money and water, not to mention time and patience.

What Is a Hot Water Recirculating Pump?

A hot water recirculating pump attaches to your water heater. It circulates hot water throughout your pipes to keep it readily available at the faucet. It’s affordable and doesn’t waste water.

Types of Hot Water Recirculating Pumps

There are two main types. One requires an additional plumbing line to send unused water back to the water heater after it drops below a set temperature. The other returns the unused heated water via your existing cold water pipes.

Why To Get a Hot Water Recirculating Pump

According to the National Resources Defense Council (NRDC), studies suggest that “over 10 percent of all the hot water drawn for showering in a typical single-family home is wasted waiting for hot water to arrive.”

Hot Water Recirculating Pump Costs and Considerations

Griccino says a hot water recirculating pump costs about $200, and many comfort systems can be DIY installed. Better to go with professional installation if you need new plumbing.

What is a recirculation pump?

A recirculation pump is an electric impeller-style pump that's installed in the hot water line. It has 3/4-inch pipe thread connectors, and you place it in the hot water line next to the water heater or near the fixture that needs the hot water.

What is the purpose of a recirculating pump?

The function of a recirculating pump is to keep hot water moving through the pipes so that it's available at the faucet immediately. It uses about the same amount of energy as a bathroom exhaust fan, and some systems are so efficient that the energy expenditure is even less than that. If you choose to install a recirculating pump, ...

How does a water heater pump work?

The pump causes a constant slow stream of water to flow from the water heater to the bypass valve and back again, which keeps the water in the pipes comfortably warm. When you turn on a faucet tap, the bypass valve closes, allowing water to flow normally through the pipes.

How to set up a recirculation system?

Other important components of a recirculation system include: 1 A check valve, which ensures the water flows in only one direction. This is a requirement for any water circulation system. 2 A temperature sensor, or aquastat, to monitor the water temperature and shut off the pump when it's high enough. This is an energy-saving feature that not all systems have. 3 A timer to allow you to program the pump to come on when at times of the day when you usually need it. This is another optional energy-saving feature.

When is the best time to install a recirculation system?

The best time to install a recirculation system is when you're installing new plumbing, because that way, you can install a separate hot water return pipe that connects to the water heater.

What is a timer on a pump?

A timer to allow you to program the pump to come on when at times of the day when you usually need it. This is another optional energy-saving feature. Advertisement. Higher-end pumps come with these features pre-installed. If you have a basic pump, you have to install the other components separately.

What is an automatic hot water system?

Most systems, however, are automatic. A sensor in the pump or installed somewhere in the hot water line monitors temperature and switches on the pump when the temperature falls below a certain value. Some other systems use a timer that the homeowner can program to turn on the system at particular times of the day.

What is a Hot Water Recirculation Pump?

A hot water recirculation pump provides instant hot water to any fixture in your home. They are installed above your water heater and work through a motion sensor placed near water fixtures. The sensor valve knowns when your water drops below a certain temperature, and automatically pumps more hot water to your system.

Why do we need a recirculating water pump?

The main benefit of a hot water recirculating pump is not having to wait for hot water. But recirculating pumps also keep your pipes from freezing in the winter.

How does a boiler water pump work?

Instead of needing a dedicated line that loops back to the boiler , this one has a sort of connector that runs between the hot and cold water lines at the outlet. It has a toggle that will open up when the pump is running that allows the hot water to pass through to the cold water line when the faucet is not open. Then the water cycles back to the boiler through the cold water line.

Why do people use recirculating pumps?

The main reason people buy recirculating pumps is to get instant hot water to any fixture. Especially in colder climates, this is a huge benefit.

How much does a recirculating pump cost?

While recirculating pumps will save you money over time, they do cost on average about $200 up front. And if you hire a plumber, the total cost of installation can be between $500 and $1000.

How much does it cost to install a recirculating pump?

It will cost from $500 to $1000 to install a recirculating pump if you hire a plumber. But of course, it can end up costing as low as zero dollars if you get an under sink recirculating pump and install it yourself.

How long does it take for hot water to come down the drain?

Now, you turn on the hot water and wait for the heated water to finally arrive. In some cases over a minute , which then washes all that water down the drain.

How Does a Hot Water Recirculating Pump Work?

The hot water recirculating pump, as the name indicates, creates a loop for the hot water to move across all the fixtures, taps, and faucets in your water circulation system. The hot water is continuously recirculated through the entire plumbing including even the farthest of the fixtures. The sensor valve on the farthest fixture shuts off the pump when hot water reaches it, and turns it on when the hot water temperature goes below the threshold set. The hot water loop is continuously maintained at all times to avoid waiting for the hot water at any of the fixtures.

What Purpose Does a Recirculation Pump Serve?

A hot water recirculating pump lets you get the hot water supply at the instant you turn on the tap. By definition, a hot water recirculating pump is a special type of water pump installed at your home that provides you an instant or an almost instant availability of hot water to your tap or other fixtures.

How Does An “Under Sink” Hot Water Circulating Pump Work?

In many situations, hot water circulating pump is installed above the water heater. While that has been a standard procedure, there are instances where a hot water pump is installed under the sink. The installation procedure remains the same as in the case of above the water heater system, but you get a localized installation.

How Much Water Could You Save With A Water Recirculation Pump?

There have been different schools of thought about it. However, it has been assumed that on average of 31 gallons of water per day can be wasted while you wait for the hot water to be available at the faucet. Looking at the average cost of water rising, that can be considered to be a huge wastage.

What is the Main Cause of Slow Hot Water?

One of the prime reasons for the slow hot water is the distance between the source of hot water and each of the fixtures where the hot water is required. Most of the homes today have larger diameter water piping, which will take a huge time for the hot water to reach the destination fixtures.

What Are the Energy Costs of Water Recirculation Pumps?

In case you have a timer on the pump, the average cost – assuming an average of three to four hours of running – you will incur $20 to 30 per year on the energy costs for your water recirculation pump.

What are the two types of recirculation pumps?

Basically, you will find two types of hot water recirculation pumps – Full Reciprocating Pump system and Recirculating Pump Comfort System . Each of these two systems come with different setup, skills, labor, and costs.

What is a Hot Water Recirculation Pump?

Hot water recirculation pumps are a nice convenience that allows you to benefit from an immediate supply of hot water to all of the faucets in your home. Instead of having to wait for the water to heat up every time you take a shower, wash your hands, or do the dishes, these unique systems will pump hot water through the hot water piping system and back to your heater. Sometimes these systems work with the cold water line. At other times, they have their own dedicated plumbing line.

How does a water recirculation pump work?

The system includes temperature sensors and a check valve that prevents water from going back into the return plumbing line. The recirculation pump actually moves water in the line back to the water heater, thus reducing the amount of time needed for hot water to reach your faucet.

What Is a Point of Use Tankless Water Heater?

A point of use tankless water heaters is usually located close to the faucet or showerhead. This strategic placement can drastically reduce the amount of wasted cold water. Because on-demand water heaters don't have a storage tank, there are no standby energy losses during periods when hot water is not being consumed.

How much electricity does a water recirculation pump use?

A pump that consumes 25 watts of power would use around 200 kWh of electricity each year. The average price of electricity in the US and Canada is $0.13 per kWh and $0.17 per kWh, respectively. So, you are looking at between about $26 and $34 each year, just to run your pump. Even if you were to trust the exaggerated expected water savings of 11,000 gallons each year, the cost of electricity to run the pump would still be more expensive than the average water savings for the vast majority of the country. Even without factoring in the $200 to $250 price tag of the pump itself (not to mention plumbing installation fees), there is no payback period.

What is Watts Premier?

Watts Premier is one company that specializes in selling hot water recirculation pumps. According to their calculations, the average household in the United States wastes 11,461 gallons of water each year while waiting for hot water to appear.

Do recirculation pumps make economic sense?

So, we have found that hot water recirculation pumps probably don't make economic sense for most homeowners based on these calculations. In many cases, the electricity cost of running the pump will cost you more than any expected savings from a reduced water bill.

Does a water pump save money?

If you live in a state (such as California) where water prices are continually increasing, a hot water recirculation pump that comes with a programmable timer might end up saving you money. However, there are other water and electricity savings technologies that are more efficient and a better deal.

How Does A Hot Water Recirculating Pump System Work?

One of the reasons hot water delays when you turn on the faucet is the distance it travels. Remember, the water needs to travel through long plumbing pipes before you use it. Also, the unused water remains in the lines. Therefore, the faucet will first receive cold water then hot water when you turn on the heater.

What is a hot water recirculation system?

Hot water recirculation systems provide near-instant hot water access, so you don’t have to wait for the water to heat every time you use a faucet or appliance. A hot water recirculation system creates a loop between the water heater and the faucet, and unused water quickly loops back for reheating.

What is a recirculating water system?

Generally, the hot water recirculating system is a pump that creates a loop that retains hot water in the pipes. You could be wondering what happens when the pump is not in use? In essence, you have to unplug this pump during vacation or when you move houses.

How easy is it to operate a recirculation pump?

When it comes to operations, the recirculation pump is relatively easy to operate. First of all, the installation process is accessible while the functions are just a touch of a button. With advanced systems, you get a remote control system located in various sections of the house. So you can turn it on whenever you are in the place.

What is water circulation?

The water circulation in the pipes is a continuous process that allows hot water availability when you need it. Some of the hot water recirculation systems come with timers to set the hours it operates. That saves you energy costs.

How long do you wait to get hot water from a faucet?

One of the most tedious parts of a regular hot water faucet is the wait. You have to wait a few seconds or minutes before hot water erupts, depending on the size of your home and the length of the pipes. You tend to waste a lot of water as you wait for hot water. So, what’s the solution?

How long can you use a water pump?

The variation in the number of years you can use the pump depends on the daily water usage, the quality of water, and the quality of the pump itself . Different brands offer varied attributes.

Why use a recirculation pump?

The most obvious benefit is that you have instant hot water in your sinks and tubs whenever you turn the faucet on. By not having to wait for hot water, you also run into the second benefit.

What are the advantages of a recirculation pump?

The most obvious benefit is that you have instant hot water in your sinks and tubs whenever you turn the faucet on. By not having to wait for hot water, you also run into the second benefit.

How much hot water can a Grundfos pump move?

This Grundfos model is more powerful than the previous model. With a 1/6 horsepower motor, you can move up to 34 GPM of hot water. It also improves the head range by allowing vertical flow up to 36 feet. If you don’t want to mount this directly on the water tank, you can put it closer to the floor or off to the side.

How long is a recirculation pump warranty?

Finally, you will want to research the warranty and the final cost of the recirculation pump system. The warranty should be at least a year-long, and one that covers the system and the pump motor separately is ideal.

What is a taco circulator pump made of?

The Taco circulator pump is one of the most durable builds around. Struck from bronze, cast iron, or flanged steel, you can choose your material as well as your connections. Each model, including the Taco bronze circulator pump, comes in either sweat, threaded, or union ¾ inch connections.

How to determine water heater pump size?

Your pump size will be determined on how many feet of plumbing you have and the capacity of your water heater tank. If you purchase a pump that is too small, it will struggle to get hot water through the house. Likewise, it can work too hard for too long, resulting in motor burn out.

What temperature does a Laing under sink pump go off?

It also comes with an auto-shutoff valve that will turn the pump off when the water temperature reaches 91 degrees and on when the temp drops to 85 degrees.

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