The Grundfos UP15-10SU7P TLC, Comfort Recirculation Pump 

yes it does, that graphic is misleading, the cold HOT water leaving via the cold pipe from the third sink will go to the cold water of the first or second or the ice maker if they are opened

@@wingnutwingnut7490 oh ok, thanks. Do you think they’ll have to install a check valve as well?

@@hyster2568 there's only two options. Either as they show it and your cold water is "contaminated" with the less clean hot water heater output water. The second option, if you have an unfinished basement in a ranch, as I do. install the pump on a return going into the hot water heater bottom (remove the drain valve and replace with a tee) This method isolates hot and cold water. There are some videos here on youtube

No No No! Every drop that the pump pushes comes from the hot water heater and the hot heater has to pull the same amount back in to replace the water that it pushed into the cold line. The water heater will use slightly more power to keep the water in the line warm and the pump uses a few watts of power.

Jose Arellano you only need 1 heating source the Manafort piece will just bring hot water to you 10 times faster

The return loop must go to the solar ☀️ heater for maximum efficiency

@@dellarossaplumbing1792 What Manofort piece?

I'd think you'd need to install a boiler drain on the cold water/return line, in a similar fashion to how one would for a recirculating system with it's own dedicated return line.

It's recommended you confirm with the manufacturer of your tankless heater, as some manufacturers will also void or cut your warranty in half if it's used with a recirculation pump.

@@Supplyhouse you will burn up your tankless becuase it will alwas be burning

@@combs1945 not if you have the pump on a timer set conservatively

@@djhealthcareconsult If the input water to the tankless water heater is hot, the heater won’t fire 🔥 up.

@@combs1945 Thi same exact bypass valve is sold by Rinnai: Rinnai Thermal Bypass Hot Water Recirculation Valve U306-1449 Grundfos 595926

built in timer, run it when your home and active or setup continuous and connect to a smart outlet and turn on when needed

This was my first thought too but it does go back into the hot water heater. The exact same amount of water that the pump pushes into the cold side is pulled back into the water heater and the comfort valve only allows only COLD water to be recirculated through the cold line. It shuts off when the water reaches a certain temperature.

@@michaelpounds675 is it really? The drawing is deceptive, the water heater in my house is not a couple inches from my cold water source (well tank). It''s actually a gas heater on the the other side of the basement by the chimney. So there's a tee at the source and a 25 foot run of cold water to the water heater and 25 feet of hot water to the start of my plumbing run. The drawing makes it look like all my cold water lines are as close to the water heater as they are to the other fixtures . The cold water and hot water to fixtures are run side be side. That comfort valve closes at about 100 degrees, even with no other fixtures open its unlikely my cold water lines will clear the formerly hot water. It really doesn't effect me I have added a reverse osmosis system with separate faucets for drinking cooking etc.. I'm going to install this system when i replace my water heater, wiring it to a smart outlet (pump set for continuous operation). So i can turn it on with my phone before i shower, laundry etc.. this should reduce well pump cycles and put less water into my septic system

Not really, thats why there is a separate return line coming from the furthest fixture. The diagram is just not drawn correctly. It will work with a check valve.

@@SkittleEagle ???? it is drawn correctly for this application There is no check valve in the drawing. just the "comfort valve" which is a thermally activated vale that allows hot water to pass into the cold lines until the water reaches a certain temp,I think it is 100 degrees. where would you put a check valve?? Check valves are used when you have a dedicated return hot water line that is a home run back to a tee on the bottom of the hot water heater at the drain valve.

@@wingnutwingnut7490 the drawing does show the return line back to the water heater. That is where the check valve would go. Maybe it depends on where you are located but my inspector ask for a check valve.