Under Sink Recirculation Pump For Tankless Water Heaters

Buyers Guide, Tankless Water Heater

under sink recirculation pump for tankless water heaters
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So, are you looking for a “value for money” under sink recirculation pump for tankless water heaters?

Well, if that is the case, then I can affirm you that by end of this post you would be able to not only buy a great under sink recirculation pump but also guide others with the related queries.

Frankly speaking, we’ve tried to cover the nuts & bolts of an under sink recirculation pump in order to help you make an informed buying decision.

So, without any further ado, let’s begin…

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Best Under Sink Recirculation Pump For Tankless Water Heaters Review

Before we dive deep into the discussion please give us a minute to explain the process that we follow to shortlist and review the products on izzysmarthomeguide.com.

We believe that by sharing the evaluation process with the avid readers of this blog the things would remain impartial and unbiased.

To begin with, first and foremost, our core team does the brainstorming and comes up with a set of parameters on which the products need to be evaluated.

Each parameter is assigned a certain weightage depending upon its ability to influence a buyer’s decision.

During the evaluation process, each product gets a score across the parameters depending upon its RELATIVE performance.

Finally, we sum up the scores and shortlists the top-performers for reviewing purposes.

I hope you’re clear with our evaluation process.

However, in case of any doubt or query, feel free to reach out to our team via the contact form and they would be more than happy to assist you.

Does it make sense?

Laing 6050E7000 E10-BCANCT1W-23 AutoCirc E10 Series Circulator with Timer

The Laing 6050E7000 is the winner of our evaluation process and has also outperformed the competitors with a tangible margin.

In simple words, the E10-BCANCT1W-23 comprises almost all the essential ingredients including durability, affordability, and performance that you might be looking for in your favorite under sink recirculation pump for tankless water heaters.

The Laing AutoCirc E10 series is equipped with innovative and advanced technology so that you can reap maximum benefits out of the unit.

The success of this under sink recirculation pump goes to a large extent to an energy-efficient ECM motor that it is equipped with.

Unlike some cheap recirculation pumps, in the case of the Laing AutoCirc E10 series you don’t require any return line.

Built-in temperature control is right in place to take care of the variation and fluctuation in temperature.

Even though the installation process is quick, easy, and hassle-free still I would recommend you to get it done by a professional to prevent any last-minute misadventure.

The package includes a 6-foot power cord along with the recirculation pump.

It can provide at max 4GPM which is more than enough to serve your purpose.

The USP of this unit is the ECM technology which not only enhances the usability but also efficiency multifold.

It is specifically designed keeping in mind the requirements and prerequisites of portable water systems.

You don’t have to waste time with any sort of recirculation pipe.

Quite a few of our clients were very particular about choosing an under-sink pump for their tankless water heaters.

There top criteria for selection was the quiet operation.

Fortunately, the unit doesn’t produce any irritating or loud noise and also you don’t have to face any sound resonating problem.

Well, in order to reap maximum benefits out of this unit, we highly recommend you should use Belkin WeMo WiFi switches.

By doing so, you can use your smartphone to set up a schedule rule so that things can be automated and done without your interference.

All in all, our TOP PICK is an affordable under-sink recirculation pump for tankless water heaters that you’ll not REGRET investing into.

[Related] Best Point Of Use Hot Water Heaters Unbiased Review And Buying Guide

Taco 006-CT-USK On-Command 1/2-Inch MPT Pump with Plumbing Connection Kit

The runner-up of our evaluation process is none other than Taco On Command and possesses loads and loads of similarities in terms of performance and durability with the aforementioned unit.

Moreover, the pump is 1/40-hp and turns on only when an end-user press the button which is good if we evaluate the things from the safety point of view.

Also, by doing so, you drastically reduce the wastage of energy.

Similar to the last pump, the Taco 006-CT-USK is easier to install and also doesn’t require a return line.

I personally liked the fact that the unit is capable of sensing accurately the hotness of the water and thus does the needful and saves you a good amount every month on your water heating bill.

Moreover, the compact and silent pump weighs just 7 pounds so installing it in a small space wouldn’t be an issue for you.

And, the best part is, the unit is uniquely designed to pump water between hot and cold pipes.

The Taco tech support team is highly professional and gives their 100 percent to deal with any issue irrespective of it being small or big.

It goes without saying that the unit is robustly constructed and highly durable, thanks to the stainless steel innards.

In simple words, it will never let down your expectation regarding hot water, and I’m making such big claims NOT just because my clients have shown trust in this unit but also I’ve been using it for quite some time now, and love everything about this little beast.

All in all, a value for money under-sink recirculation pump that you can afford even though you’re on a shoestring budget.

Trust my words, the brand delivers what it promises.

Laing LHB08100092 AutoCirc Recirculation Pump with Timer

The Laing LHB08100092 is yet another great option for buyers who are on a shoestring budget.

Irrespective of being highly affordable, the unit doesn’t compromise on quality and performance, and as a result, its popularity has surged exponentially in the last couple of years along our client base.

For the optimum result, you need to install it either under the sink or under the faucet farthest from the water heater.

Like the aforementioned under sink recirculation pumps, the Laing LHB08100092 also doesn’t require a return line.

Of course, it operates quietly and claims to produce noise less than 30 dB.

Along with the unit the package also includes a 6 feet long power cord.

A built-in 24-hour timer is right in place in order to help you do the proper selection of system operating periods.

Moreover, the unit is idiosyncratically designed and equipped with advanced technology to help an average family of four in saving water up to 17, 000 gallons annually.

And, the best part is whenever the hot water supply line cools down to 85º F the auto circ pump is automatically turned ON, thanks to the built-in temperature sensor.

Similarly, the pump turns OFF when the hot water supply line to the faucet reaches a temperature of 95º F.

Also, the unit is backed by a year warranty which clearly depicts the trust and confidence of the manufacturer in its offering.

Overall, it’s one of the most affordable under-sink recirculation pumps available on the market.

Under Sink Recirculation Pump For Tankless Water Heaters Buyers’ Guide

Whether you’re a first-time buyer or a seasoned professional, the piece of information that we’re gonna share in this guide would definitely benefit you.

Our core team has tried to the best of their capabilities to bundle information in one place so that you can reap maximum benefits out of it.

Things To Look For In An Under Sink Recirculation Pump For A Tankless Water Heater

Let’s have a quick look at some of the “must-have” parameters that you shouldn’t ignore when it comes to buying an under sink recirculation pump for your tankless water heater.


Needless to say, price is an important buying parameter that can either make or break a purchase especially if you’re a price-sensitive buyer like me.

Fortunately, all the under sink recirculation pumps that were made to our list are reasonably priced and will not make a dent in your pocket.

In fact, you can afford them even though you’re on a tight budget.

But, it doesn’t mean that these pumps are inferior in any respect.

Nonetheless, we always recommend our clients to buy pumps that not only cater to their needs but also fall well within their budget.


It’s always good to buy a product that comes with a warranty.

The longer the warranty the better it is.

In other words, a longer duration of warranty simply depicts the trust and confidence of the manufacturer in its offering.


Look for the pumps that are equipped with advanced and innovative technology so that you can reap maximum benefits out of it.

A pump that comes with advanced technology enhances the usability, and convenience multifold.

Also, it helps in making the operation smooth and hassle-free.

Safety & Security

It’s always good to be safe than sorry.

Make sure the pump that you’re buying is safe to use and doesn’t come with a life-threatening drawback.

Also, confirm with your buyer twice about the safety features available on the unit.

It’s always good to pay some extra bucks for getting a pump that is relatively safe and secured.


It goes without saying that all the under sink pumps for tankless water heaters that made to our list are robustly constructed and durable.

These little beasts are meant to last longer and the same has been affirmed by our clients as well.

Compact & Portable

All the pumps that we’ve reviewed so far are compact and portable.

In fact, you can install them in small spaces without any hassle.

Also, they can be easily transported from one place to another, thanks to their lightweight and sleek design.

Under Sink Recirculating Pump For Tankless Water Heaters FAQs

Let’s have a quick look at some of the important queries that I often get from my clients related to under sink recirculation pumps for tankless water heaters.

What is an under-sink hot water recirculating pump?

You can think of a special type of water pump that is used for providing instant and on-demand hot water to your home fixtures.

As the name suggests, the pump is uniquely designed for installation under the sink which is farthest from your centralized heating system.

By doing so, all the fixtures present between the water heater and the hot water pump will get instant hot water.

In simple words, it’s a unique and highly effective way to provide instant hot water to almost all the fixtures present in an apartment.

How does an under-sink instant hot water circulating pump works?

Now, you know what is an under-sink pump and for what it is used.

Let’s dive a little deeper to find out how does it work.

When the pump starts operating, it simply sends the lukewarm water in the hot water line down the cold water line and vice-versa.

In layman’s terms, what actually it does is basically turns the cold water supply line into a temporary return line – creating a loop back to the hot water heater.

Once the hot water has reached the water pump, the sensor senses the temperature and closes both the valve and the pump.

As a result, the cold line is not used anymore.

Almost all the under-sink hot water recirculation pump comes with a built-in timer so that you don’t have to switch it on/off manually rather you can set the timer for the purpose.

Many of the first-time buyers wouldn’t be aware of the fact that by using an under-sink recirculating pump, you can save up to 3,600 to 12,000 gallons per year.

Built-in Sensor Valves

Sensor valves are built-in components of an under-sink recirculation pump and play a crucial role in its working.

It senses the temperature of the water and opens and closes accordingly.

On the other hand, recirculation pumps that are installed above the water heater don’t come sensor as the part of the unit.

In such cases, a separate sensor valve is installed under the farthest sink from the water heater that works together with the pump.

Four Water Line Connections

Almost, all the under-sink recirculation pump comes with four water connections which are two more than the water connections present on an above heater pump.

Two water lines go from pump to hot and cold lines respectively.

The remaining two are for the hot & cold water supply lines from the wall.

How to install an under-sink recirculation pump for instant hot water?

Well, I’m attaching a self-explanatory video for your perusal.

Locating the Sink

First and foremost, you need to locate the sink that is farthest from the centralized hot water system.

You need to install the pump under this sink to reap maximum benefits from it.

Outlet Location

Once you’re done with the aforementioned step, the next thing that you need to do is to locate the outlet.

In general, most of the instant hot water recirculating pumps are installed with a standard 3-pronged plug. 

In case, you don’t have an existing outlet in your bathroom or wherever you wanna install it including the above vanity outlet, then you don’t have an option but to install a new bath outlet under the vanity.

We prefer cabinets over other locations.

If you want to try it over a bath wall outlet then all you need to do is to route the plug cord behind the vanity and to the outlet.

Fasten to Wall

Now, you’re done with the primary steps.

So, it’s time for the most important step, that is, installing the water pump on the wall.

Use the brackets and screws that come along with the water pump and fasten it to the wall.

Make sure that you’re mounting the screws in the approved orientation by the manufacturer to avoid any last-minute misadventure.

You might not be aware of the fact that some pump demands installation only in the vertical direction.

Meanwhile, ensure that all the control units including timers are easily accessible.

Turn Off Water

It goes without saying that you need to turn off the water before even you start installing any water connection.

All you need to do is simply turn the water valves in a perpendicular direction to shut off the water in case it is a ball valve.

Well, if the valve is a circle then the probability is very high that it would be a push-pull type stop valve.

So, to shut off the water you need to pull it off.

In case of any doubt or unprecedented scenario, we recommend shutting off the main water valve to the entire house.

Remove and Reconnect Faucet Water Lines

I’m assuming that till now you’re done with the installation of the water pump onto your wall as well as under the sink.

In the next step, you need to remove the flexible water line end from the faucet.

The end under the sink can vary in the range of 1/2-inch or 3/8-inches depending upon your sink setup.

Don’t do the mistake of removing water line ends coming out of the wall.

You’ll need a wrench to remove the metal or plastic nuts.

Once you’ve removed the waterline ends, the next thing that you need to do is to inspect properly the quality of the rubber washers and make sure they are in good and usable conditions.

Now, it’s time to connect these water lines to the 1/2-inch water pump nipples.

Check the location of the hot water lines and make sure that they are on the correct side.

Screw-On Water Inlet Lines To Pump

Now, it’s time to screw on flexible water lines to the water pump toward the 1/2-inch ends.

After the screwing has taken place, you need to verify that the hot water line goes to the hot water inlet of the pump and vice-versa.

Moreover, the pump should clearly indicate the hot & cold sides.

If your water line isn’t 3/8-inch to 1/2-inch then we suggest you should buy a steel braided water line.

Screw-On Water Outlet Lines To Under Sink

Now, it’s time to take the new flexible water lines that comes with the pump and connect them properly to the faucet.

The hot water line from the faucet should go to the hot water line from the pump and vice-versa.

Any other configuration will not work.

Connect these lines to the outlet nipples of the water pump.

Turn On Water

Yes, you guessed it, Right…

You’re done with the installation process.

Now, it’s time to test your system in order to prevent any sudden surprise or shock.

All you need to do is to turn on the water and checks for leaks.

Rubbing your finger along the connection area can help you to feel the presence of leakage if any.

If you can’t find any leakage then all you need to do is to plug in the pump.

How can I inspect an under-sink recirculating pump?

Well, whether you’re a newbie or a seasoned professional, the steps that I’m gonna share in a while will definitely help you in inspecting your under-sink recirculation pump.


First and foremost, you need to check the attachment and level.

All you need to do is to pull and tug on your water pump in order to make sure that the attachment is permanent and secured.

By doing so, you would be able to know whether the pump is attached properly to the cabinet under the sink or NOT.

Corrosion & Rusting

It’s always good to figure out corrosion if present as soon as possible so that you can minimize the damage caused by it.

It goes without saying that the presence of multiple flexible water line connections can cause leakage.

So, to avoid any unprecedented scenario, you can verify that the water lines are barded stainless steel and not made of a cheap material such as rubber.

Also, manually check for any sign of leakage, corrosion, and rusting.

Line Connections

Last but not least, you need to verify that the line connections are correct.

I hope you’re aware of the fact that there is a hot and a cold side to the water pump.

The hot side has a supply of hot water and has a second flexible line attached to the faucet for hot water.

Furthermore, you’ll find a similar connection for cold water as well.

So, all you need to do is to check for the line connection and make sure that everything falls well in place.

Wrapping Up | Under Sink Recirculation Pump For Tankless Water Heaters

First and foremost, I would like to thank you for being with us till the end.

Secondly, I would like to bring to your notice that I along with my core team have put loads and loads of effort into coming up with this idiosyncratic superlative piece of information.

And, in case, you liked our effort and want to appreciate us then please do share this post with like-minded people and the ones who are in need of it.

After all, sharing is caring, isn’t it?

Cutting long-story-short, all the under-sink recirculation pumps for tankless water heaters that made to our list are of high quality and worth the investment.

We follow a very strenuous & rigorous method to shortlist the product so that our readers and clients can reap maximum benefits out of our review.

Do let us know in the comment section your view on the under-sink recirculation pump for tankless water heaters.

That’s all, as of now :):)

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