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How much more expensive will your utility bill be? Whether your water is heated by gas or electricity, a recirculating pump will cause a drop in the temperature of the water in the water heater tank causing the tank to turn on to heat the entire tank.
IMPORTANT CAVEAT: These pumps clog and fail with cast iron radiation (very common in the Northeast). The ECM pump magnetic field attracts iron oxide from the old pipes, clog and fail. If you don't mind callbacks and pissed off customers, put an ECM in a system with cast iron radiation. By the way, NEVER replace cast iron radiation... the huge thermal mass is fantastic for efficiency. One might be able to use a magnetic wye filter (needs to be 100% efficient). It's all in the physics.
I have a Grundfos with the three settings ,hooked up to a Honeywell two wire thermostat (This unit is for heated floors)if i disconnect the thermostat the unit works , how do i control temperature
My hot water recirculation system's electricity costs zero to run per year. If you have a return line from far end - look into using a gravity system. Zero maintenance and works great!
@@bigdog8008 No reasonable amount of insulation will keep the hot water in the pipes from shedding significant amounts of heat over time. The reason your hot water tank cycles on even when no hot water is used is because heat is lost through the insulated walls of the tank. Keeping the water in the pipes hot along with the water in the tank will add to that loss even if they are insulated. Also, most people aren't going to tear down walls to insulate their pipes.
Mark Thank you for a great video. Our house was built in 87 and it takes long time to get hot water in the shower. We also have a water softener. I heard that to install a recirculating pump you have to do something to the softener. Can you let me know what that is? Thanks in advance
I moved into a house that is 16 years old. It has a UP10-16BN5/LC. Other than how quick the water gets hot at the faucet, how do I know this unit is still working/running. Thanks.
A plumber just replaced my grundfos pump,. We had the one that had a plastic cap that covered the timer switches, we didn't use the timer at all. They put the second pump you show in this video and the hot water take like 5 to 10 minutes to start up. I tried it at 100% as well. Any ideas we have that furnace type tankless water heater
is the 14-day "learn mode" a single, one-and-done process that happens the first time the unit is turned on or is it a sliding window that is constantly learning? In a new build, the builder will test the unit to be sure it works. If that builder uses the only single, one-and-done 14-day learning period, then nothing the owner does after he moves in will change when the unit turns on or off. If the 14-day learning period is an ongoing, sliding window, then the homeowner's habits, not the builder's testing, will govern when the unit turns on/off. Please clarify because none of the documentation on the Grundfos website answers my question.
Great explanation! We just installed a new water heater and installed the 3 mode version of your pump. The manual gives a pretty basic explanation but I really appreciate your detailed explanation and your recommendations.
I was wondering where to order the union with the larger body to accommodate the check valve. S Is the 98420224 the larger union for check valve? Several of the GRUNDFOS have been discontinued. I could only find the 98420223.
Question: I've got two separate circuits, one for the left side of the house, the other for the right side of the house, each with their own return line. If I installed a single pump at the drain on the bottom of the hot water tank, might I have problem with it pulling more from one side compared to the other, so that the users on one side of the house will have hot water, but the users on the other side won't? Also, I imagine that each circuit would need its own check valve so that one side doesn't pull from the other.
I am a plumber and I just did a renovation in a house similar to yours. I had to run 2 separate return lines with 2 separate recirc pumps. I used the 3rd one he showed
I've had issues w/ my comfort 10-16 from day 1 in temp control mode (Not auto adapt). I have the Tsupply sensor on the DHW outlet about 10" from the tank and the return Treturn is integral to the pump obviously. Tsupply is 95F (Should be at least as it's based on my IR temp gun) and Treturn is near ambient at 74F. So either the Tsupply or Treturn sensors are bad I feel The pump is ALWAYS in standby except for initial power up. Ever seen this? I am having a hard time getting ahold of anyone at grungdfos.
Hello. I have the UP 10-16 Auto pump which replaced the one that always stays on due to make a loud buzzing noise after 2 years. I had a plumber replace it but after 48hrs the new one is making the same noise when it runs on the auto feature. Do you have any recommendations or suggestion of what the issue can be?
Hi, thanks for the video and the explanation. LEt me ask. Why should i use an expansion thank on the return line if it goes into the cold water side, and why is better to mount the return line into the drain valve of the tank? that`s what i understood. is that correct? thanks
Is changing the boiler settings to “thermostat and constant” specific to the LP conversion? Also right after you would have to perform a combustion test and adjust the throttle screw correct? Also wondering where the little window is to visually check the flame..
Thank you for sharing this information. I have a Laing pump on my system that has gone bad and was told that the Grundfos pump might fit directly into the Laing body. Do you know if that is the case or will I have to cut out my Laing and reinstall the new system??
I wished that I viewed this when I first got it. The plumber said to keep it on "auto". Like you mentioned most people do not live such a regimented life. Auto did not work for me. I thought "auto" was the only options. I found you and now I am going to try it on "temperature" mode. Hopefully, I will be happy with it now. You explained it very well. Thank you
Incomplete or purposely omitting description of energy costs! I agree that the cost of running the pump is almost nothing, but it is the cost of unnecessarily re-heating the cooler water returning to the tank that is the game changer. You should use a timer or manual button switch or the auto learn mode.
In no way is the purpose of this to save $ on heating water. It is for A) comfort and B) saves on water waste. If you want to save $ on heating water, do not use a circulator.
Great explanation! We moved into a house and had no idea what this was on our hot water heater and could not find a manual online. This video answered all our questions. Thank you for the easy explanations!
