Last Updated on
1 Year Warranty
Product Overview: This pump will do the job and comes with all hardware necessary to get up and going fast. It has a built in programmable timer and touts that it can save up to 15,000 gallons of water per year.
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On this page:
Part One: Information on Hot Water Recirculating Pumps
- How Does A Hot Water Recirculating Pump Work?
- Pros And Cons To A Hot Water Recirculating Pump
- Using A Hot Water Recirculating Pump Off Grid
- Making Your Hot Water Recirculating Pump Smart
Part Two: Hot Water Recirculating Pump Reviews
Water conservation: it’s not just a hot topic reserved for the green movement, it also applies to us in a very personal way.
Our personal water usage is quite high here in the states. According to USGS, we use 80 to 100 gallons per person on a daily basis!
Many of those gallons are wasted by running the water just waiting for it to get hot. Nothing like watching fresh potable water run down the drain; for me, it’s a frustrating experience!
All of this wasted water costs money, tacking on dollars to your municipal water bill. This is even more costly when you have to haul in water on a cistern system.
With new technology, we have a way to save all those gallons of water by installing a hot water recirculating pump, joy! I am so excited about this!
Not only do these special pumps drastically reduce the wait time and waste of waiting for hot water, but it also gives you a bit more hot water as the heated water is stored in the pipe. Trust me, I live in a camper with a 12 gallon tank. Another minute to shave my legs is a godsend!
In this article I intend to address all aspects of this pump and offer you in-depth hot water recirculating pump reviews.
Lets get into it!
How Does a Hot Water Recirculating Pump Work?
A traditional water heater works by heating the water in the tank with heating elements, and then pushing the water through the heat out pipe. This centralized system causes lag time and wasted water.
The hot water recirculating pump provides practically instant hot water to the tap by installing the pump inline and keeping the water in the pipes hot.
In an on demand water system, the pump works by using a temperature sensor and a check valve that keeps water from entering into the return line. The pump then moves room temperature water back to the water heater. The sensor notifies the pump when the hot water has arrived at the farthest fixture and therefore shuts the pump off.
Essentially, the hot water within the pipe circulates continuously and is ready to be released upon demand.
Under sink model of pump
Pros and Cons to a Hot Water Recirculating Pump
Now normally I would start off with the pros, but in this case, there is one rather glaring CON and I want to share it with you right away.
Con #1: Higher electricity consumption
Since the hot water recirculating pump always holds hot water in the pipes, this will cause an increase in your energy usage. The pump will always circulate hot water in exchange for your beck and call, but the give and take is an increase in your electric bill. I will note that this increase is not too substantial, but could add up over time.
However, there is a very easy remedy to this dilemma! Placing your pump on a timer is a simple and affordable solution to this problem.
Some pumps come with a built-in timer, but for those that don’t, you can purchase a cheap timer for installation.
You can add insulation to your pipes that can help retain heat for even more energy saving benefits.
If you do these extra steps, the extra electricity consumption will be hardly noticeable.
Con #2: Corrosion
Water chemistry and aggressive flow velocity can cause the recirculating pipes to
corrode quickly. This corrosion is usually concentrated in bends and angles. If this becomes a problem, the only solution is to reduce angles in piping and slow the flow with a lower capacity pump.
Con #3: Low Flow
Make sure before you purchase your pump that the head pressure is appropriate for your needs. Some models have small motors which cannot provide the desired flow.
Now for the pros!
Pro #1: On demand hot water!
This one is clearly obvious as that is what the product intends to do. Since the water sitting in your pipes stay heated, the water will come out hot almost instantly.
Pro #2: Less wasted water
Another obvious but mentionable pro is that not having to wait for hot water equals to many thousands of gallons of water being saved. How many gallons could a hot water recirculating pump save? According to manufacturers, up to 15,000 gallons per year! That’s a whole lot of showers!
To me, that figure seems quite optimistic. There are studies done that debate this kind of savings, some saying as low as only 500 gallons saved per year and others claiming 5000 gallons. Usually the truth lies somewhere in the middle, so an average home will probably save between 5000 to 10000 gallons per year.
Pro#3: Easy installation
Even if you are minimally handy, this type of pump is extremely easy to install and does not require any special tools.
Pro #4: Works great for large houses
If you live in a large house, waiting for the hot water to come can feel like an eon. Heat loss is also a concern for the hot water to have to travel such a long distance. Using this pump can save you a massive amount of water and if installed with a timer can save you on heating costs as well.
This house could benefit from a hot water recirculating pump!
Using a Hot Water Recirculating Pump Off Grid
This type of pump can really help out in an off grid situation where water resources are scarce. It will be essential to have your pump on a timer, and even better yet, a sensor. If your system is not “smart”, you can easily deplete your solar electric resources.
A typical hot water recirculating pump takes an average of 30 watts to run per hour which could add up if left on consistently. For a 100 watt solar panel, that would eat up 1/3 of its electricity output hour by hour.
I would suggest making your pump as smart as possible to minimize energy consumption.
You can check out my article on how to build an off grid water pump system for ideas about using pumps for off grid systems.
Making your Hot Water Recirculating pump smart
Although many of these pumps come with a built in timer, it just doesn’t quite make the pump smart enough to limit energy usage.
My recommendation would be to purchase a programmable wifi outlet. You can control this outlet with your smartphone to turn it on and off and also set a timer.
Just plug into the outlet that you intend to plug the pump into and download the outlet app. Simple!
Although not perfect, the hot water recirculating pump will save you tons of water, and if installed and managed properly, will not cost but a few bucks extra a month to run.
On to the reviews!
Hot Water Recirculating Pump Reviews
The Watts 50800 Recirculating Pump is my top choice because it’s ready to go out of the box; no need to take a trip to the hardware store!
It also has high customer reviews for the quality of the product. Many say that it lasts for years, even in extremely hard water conditions.
The pump runs quietly and has a built-in timer, another component that you do not have to purchase separately.
Watts timer diagram
This type of pump is an inline pump, you can install it right at the water heater or anywhere on the line, as long as it is installed on the mainline from the water heater.
A couple of things to note is that if there is a power failure, the timer will need to be reset. This could be an inconvenience, considering where you install the line. I would recommend plugging in the pump to a smart outlet which can be accessed remotely via wifi.
This pump is not compatible with all water heaters, namely tankless water heaters and water heaters with heat traps as there is an incompatibility with the nipple connectors on the trap.
The manufacturer claims that you can save up to 15,000 gallons of water per year with this unit. I am assuming this would be for a standard family of four on a municipal water source.
Your results will vary but water savings will likely be in the thousands of gallons.
The pump itself is nearly silent, but some users have complained that it takes up to 30 minutes to heat the water through the return line so you need to plan in advance when the timer turns the pump on.
There will be some tepid water that flows through the cold faucet but it takes only a few seconds to flush out.
There have been some complaints that support is not great from this company, but they will follow up eventually if there are issues with the pump.
Watts installation diagram
Overall, the Watts pump is a great choice, just make sure that your water heater is compatible before buying.
1 Year Warranty
The Laing pump is a nice choice as its compact design allows for easy installation under a sink.
The pump only emits 30Db of sound, making it one of the more quiter pumps.
The manufacturer touts that the pump will eliminate up 17,000 gallons per year of water waste for a family of four. That is quite a lot of water saved!
Although spendy, this model does have a built in timer which will save some money. It also has a built in thermostat that cuts off power to the unit, therefore adding to power savings.
Estimates to run this pump are about $12 per year, so keeping it on all the time won’t break the bank.
People having trouble with faulty equipment have received excellent customer service and quick replacements.
There have been reports of a broken impeller within the unit, so make sure to check the components for installation.
Overall, the unit is very good for its compact design, excellent customer service, and built in thermostat.
$ $ $
1 Year Warranty
Grundfos pumps are well known for their durability and can last for many years. One user reported that his Grundfos pump lasted an astonishing 24 years!
This pump will do the job it was built for and runs so quietly its hard to tell that it is even on.
The price on this pump is really low compared to other pumps. It runs much less in price on Amazon than it does in the hardware stores.
Although it doesn’t come with a timer, one can be bought for 10 to 20 bucks and it still costs less than the other models available.
The pump only uses 25 watts of power which shouldn’t make your energy bill go up very much, especially if you place the pump on a timer.
Get a cheap timer for your Grundfos pump
The main concern I have for this pump is that it is made of cast iron. Although this makes for an extremely durable pump that can last for decades, some users reported rust coming from their faucets.
It is hard to tell if the rust originates from the pump itself, or from old water heaters. It is something to take note of and keep an eye out for.
Make sure to never run this pump dry or without nominal pressure in your water system. The bearings in the unit require water flow and pressure to function.
The pump can tend to run hot but it is rated for 240 degrees so it should not be a concern.
Overall, the Grundfos pump offers a great price and durability that cannot be surpassed. Get a cheap timer and you’ve got yourself a great deal on a pump.
The line of Taco pump products is well known for its workmanship and durability. One user says that his pump has lasted 38 years before needing a replacement!
The design is more compact than other pumps and is made of bronze.
This pump uses sweat valves instead of threaded valves, which has a tendency to leak much less than its threaded counterparts.
The unit has replacement cartridges so if something did break, you can swap out the cartridge as opposed to purchasing a whole new unit.
This pump does not come with a timer so I recommend purchasing a smart outlet so you can set it up with your phone.
Users report that the unit does run hot which is normal.
Overall, the Taco is highly durable and is a good standard choice for a pump.
The Sharkbite fitting makes installation a snap.
Connections are done easily in tight spaces without the need for glue or solder.
Make sure to check the connector size and order the appropriate piece.
These little plugs are awesome! You can control your outlet from your phone, anywhere in the world.
You can set the timer, share with others, and make a schedule.
Plug in, install the app on your phone, and follow the instructions.
This will work great with any pump of your choosing.
Very low price for the convenience.
I hope you found this article helpful in informing you about hot water recirculating pumps and making good purchase decisions.
You may also be interested in my article about the best submersible sump pump for moving tons of water!
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Creator of Maximum Off Grid
Hello, I am Regina! I am the creator and brain-child behind Maximum Off Grid.
My goal is to educate and inform people interested in becoming independent from the system.
I also provide valuable reviews on products and service that I research thoroughly and make quality recommendations.
I hope you are enjoying my website!