Hot water - Without wasting cold - Metlund D'Mand Instant Circ Pump 

Matt, you look so young. I'm so old that in videos of me 10 years ago I still look old! I enjoy your channel! 😊

This video needs a revisit !

So glad your video popped up in my RU-vid feed. I have a combination boiler/hot water system in my home. It’s been good and bad, and maintenance is costly. My kitchen is on the opposite side of the house, and I feel like I waste water, trying to get hot water in my sink. Thanks for your informative videos.

just found this video and how far you've come! amazing!

Wayne, thanks for your complements! We discussed an electric tankless but this Casita has a small kitchen & a full bathroom so we needed more hot water than a small unit could supply. The gas tankless was existing so all we had to do was pipe the water to the Casita and install the Metlund pump. They run about $300-400 plus install so it's a great solution. We also stubbed out for an outdoor gas tankless to be added in the future if necessary. Best, Matt

Thanks Joe! Really appreciate all your advice. I rented a Canon XA10 with a wireless setup and it was sweet! Hope to buy one in the next 6 months. Great suggestion on adding the website to the description. Best, Matt

Wow how you have changed since this video was done

Fantastic Matt, great sound, nice edit and graphics, informative...you have hit your stride. Suggestion you might put your web site in the description or annotations..You Da Man!!

The Bosch 1.5GPM unit would run a faucet but not a 2.5GPM shower and certainly not two fixtures at once. I would also expect it to need a dedicated 20amp circuit. The Metlund D'Mand pump seemed like a better solution.

Hi Matt - love your videos. Thank you! I have a Noritz NR98SV and I’m adding an attic bathroom. I want to put in a dedicated return line while we’re at it and I’m happy to hear about the Metlund. A water heater guy here said a recirc would work but would shorten the life of the Noritz and void the warranty. Any thoughts about that? Btw he was recommending the Grundfos 1529. Thank you, Mark K

Did you run a dedicated recirc line back to the water heater or did you install it like a retrofit which forces the hot water into the cold water line?

Hey Matt... Big fan of your work. I wonder why you did not do a small electric on demand, instead of the recirculation pump? I want to put in a little electric unit under my kitchen sink, would love to hear your opinion.

How does the water from the pump get back to the hot water heater and how is it connected to the heater once it gets back there?

great video. I have 2 bathrooms less than 20 feet from each other. do you have to install a pump at both locations? or is it perhaps a single pump with a recirculation line installed as well? let me know if you can clarify.

This is an awesome video! Still relevant almost 10 years later. However Metlund pump doesn't exist anymore. I can't find another water recirculation pump with the activation button like the Metlund. Is there an alternative you're aware of?

The 3- to 4-second delay in getting hot water out of the tap in this video was the time it took for the water to get from the under-sink pump to the aerator on the faucet, not the time for it to be delivered 75 feet from the water heater. The actual time to get hot water from a "cold start" condition is how long it takes from the moment the pump is triggered with the pushbutton until it shuts off when it senses that hot water has arrived, and that can vary, depending on the distance to the heater, the size of the delivery pipe and the capacity of the pump. Low power pumps can take several minutes to deliver water. By using a high power pump, like those used for hot tub spas, the wait time can be reduced to around 20 to 30 seconds.

Can anybody make me clear, so that cooled down water in the "hot water line" goes back to tankless water heater via recirculation line? And how do you know when your hot water is ready after pushing the button? How do you know when you need to push the button again?

Hi. I have a 30 gal electric water heater in my house which is right by my bathroom so water is hot rapidly but if someone takes a long shower, for example, mine is just barely warm. Would this help that in any way? Or is it just to keep hot water available quickly? Thanks!

If I'm not mistaken, isn't the "pump" actually a TACO pump? The cooling fin's on the pump body leads me to believe it's a TACO 0011-SF4 rated at 31GPM flow rate. If you research Metlund pump website you find that these systems operate based on Temperature Differential or 'deltaT' and not on a selectable temperature setpoint. So, depending on the water temperature in the pipe really does make a difference. Say, if the water temperature was 50F and the temperature differential was set at the 9 o'clock position it would shut-off the pump when 65F water reached the pump not the 115F degree water temperature you stated in the video. I found this info their troubleshooting documentation on their website. At 3:33 you pushed the button at 3:46 you still hear the pump running so why state at 3:48 "it turns off after just a few seconds". If it could deliver hot water in 3 seconds from the 70' away tankless water heater, it would rip apart the inside of your pipes. Tankless water heaters add at least 3 - 5 seconds before reaching thermal capacity to begin heating the water.

No mention about how much insulation was put on both of the pipes between the buildings?

Or, you could purchase a Navien A series Tankless water heater with a built in recirculation pump and their optional "Hot Switch" and have the whole recirc built into the system.

..great..pays for itself in 20yrs..perfect.!!

Insufficient information. How is this thing plumbed? Does it return the water to the inlet of the tankless heater? Is there a checkvalve or two somewhere?

Does the cold water line gets warm like some other types of pump?

something like this? Bosch AE-9.5 PowerStar 1.5 GPM Point-Of-Use Indoor Tankless Electric Water Heater Thanks for your time...

I don't understand how the cold water faucet (at the recirc pump location) doesn't produce hot water when opened?

I installed my tankless for about $550, that's including the water heater and necessary plumbing. I guess my labor is cheaper than yours. It's useful to be handy.

The only thing I don't like about this set up is having to push the button ahead of using the water. I'm sure it's something that becomes automatic over time, but I just like for things to work consistently. If I want hot water, I reach for the faucet. I'm so set in my ways that I probably would've just sprung for a second (albeit smaller) tankless heater. But that's just me. I don't like having to add the step of hitting that button first. I'm sure most wouldn't mind, but I'm also sure that I'm not alone in my feelings over that button, lol.

Wanted: A pump that learns how often it needs to run to keep the water at specified temperature during certain hours (multiple levels if possible), or modulates the pumping speed (and power consumption) for the same effect.) Like this: www.smartrecirculationcontrol.com/ Use it with any dumb, cheap pump.

Great video, thanks. However, demonstrating this after you had "already pressed the button just a while ago" is not really an honest representation of this system. I know it would have taken a little while to let it cool down for the demonstration, but isn't the whole purpose of this video to show off this technology? I would rather have seen a more realistic "so now we've pressed the button and we can rearrange the countertop while we are waiting for the hot water to be delivered to the cabana." sort of representation. The internet is too full of "oh, yeah, well, I sort of had this all set and primed beforehand so I can't demonstrate how it works in real life."

I'm not impressed. The difference between pushing that button then going away for a while and turning on the hot water tap and going away for a while is that it shuts itself off automatically. The pump does NOT add its pressure to the 50 psi pressure from the mains. So the time to warm up the 50 feet of pipe is about the same. Comparing it to adding nothing to the hot water line . . . The ONLY savings is that it turns itself off at exactly the right time. You still have to remind yourself go back to the sink within a minute or it cools down again. You still have to time yourself !!! If the comparison is made with running the hotwater yourself using the faucet (no pump) the only savings this system offers is water not going down the drain. Thus compared to waiting for the water to warm up with the running of the tap, you are not saving energy because it is returning. You are saving water. Thank you for your video. I now feel better with the $300 electric heater under the sink I have that does not require me to anticipate my need for hot with the pushing of a button and then remembering to go back to the sink after a few minutes.