No control valve - not good
931535
I did not realize that the pump did not come with a control valve,  Without the control valve I could not control the pressure of the water from the pump and thus it kept overflowing and causing puddles on my floor.  I eventually took out the filter and that seemed to help keep it from overflowing but what is the purpose of having a filtered water dish if you cannot use the filter?
4372970
Complete junk.  This valve leaked from day one.  Unfortunately I installed it after the 30 day return window so I'm out the entire product price.  If you take the chance and buy this valve make sure you install it right away.  I will never deal with this company again.
4100308
Folks I am just telling you like it is.  I purchased this unit with the intent of zone heating my water in different sections of my house.  I had the unit for quite a while before I actually got around to installing it.  Once installed on a water line that has an average of 47 psi at 10 GPM flow, a properly grounded outlet, and the factory venting. The unit does not work.  What's worse is I contacted the MFG tech support who sent me a reply to read their online tech support.  This told me that systems that operated below 40psi (approximately) may need to have the diaphragm pressure adjustment screws moved to accommodate lower water pressure.  So I spent 3 hours messing with those screws until the unit finally fired up.  Then when I turned off the hot water, the unit kept running with NO WATER flowing thru the unit.  It did not shut off until I turned off the gas valve.  This could have been an extremely dangerous situation.  Now I had the temp and pressure valve attached for safety, but I was still VERY uncomfortable with this thing running with no water flow.  While I have to be honest and say that I am still waiting for an answer from the tech support.  I believe these units to be very unsafe and the control system for the burner to be too temperamental for long term use.  I believe I purchased a $300.00 piece of scrap metal.  If you have purchased one of these units, don't wait around for the warranty to expire before you try it out, and be prepared for a very disappointing purchase and costly install.  Again, I am no expert and you must make your own informed decision.  I am just stating what my experience has been with this purchase.  I am out $300.00 plus another $200.00 in installation materials plus many hours of labor. Do you want to make the same mistake?!
*****
UPDATE:
The service dept. finally called and suggested that I inspect the wiring and run a couple of test.  I did find a bad connection and repaired it and then dissassembled the control valve to find a very tiny piece of plastic obstructing the operation of the flow control valve.  Re-assembled the unit and it has been working fine every since.  I had requested that the mfg. replace the flow valve since this really should not be taken apart and they of course never replied.  Even though this unit is working well now, I stand by my decision to label it BUYER BEWARE.  Once I start having problems with it agian, I will remove it from service and install a more reputable unit.
1229577
This is a totally worthless solenoid valve. The 3/4" threads on each side are not tapered, (not National Pipe Thread) so you cannot stop this thing from leaking. I tried Teflon tape, JB weld and epoxy and cannot stop it from leaking 30 PSI water. Unfortunately, I bought two of these. Lesson learned!
4316703
Valve leaks air when it is supposed to be closed.  I opened it up and took it apart and there was a damaged O-ring.  I replaced the O-ring and it still leaked.  Though it is all metal construction, it apparently is not built precisely enough to work properly.  The ports are also very close together which makes it hard to make connections.  I female quick disconnect type fitting is too large to use without adding a nipple and a elbow.
3486738
The Valve leaked from several places.  I installed correctly but leaks rendered it unusable. I emailed the company but did not here from them.  Once installed, the valve cannot be removed.
3735312
I bought a 7 year old house with one of these in the garage. It leaks like crazy through the valve handle, it has to be turned clockwise and counterclockwise repeatedly to get warm water and there's now something wrong with the anti siphon valve on top, rattling and leaking. I can now barely get a trickle of water unless I deadhead the hose and force full pressure before turning the water on. And this often takes multiple tries.
3959372
Was happy that I found z-wave water shutoff controller that does not require plumbing work. Although item came without any instructions (it clearly was a returned item) I was able to find instructions on EcoNet site on how to connect to my SmartThings z-wave controller and how to properly install it over shutoff valve. Pairing and installation was painless. Once I started testing I've realized it is under powered and unable to completely shut valve off. When it gets to "almost" closed position, motor starts struggling and keeps trying to close valve continuously. At that point, if I give lever a little push towards closed position, the motor will stop struggling and rest. It clearly does not have enough power to close my main water inlet. Returning and getting integrated valve system (Iris for example) and doing extra plumbing after all.
4463620
Valve stem will not stay closed. Closed the stem with it deflated and it came 60% out and any amount of pressure would pop it out. A piece of junk.
4114178
As many others have said, the check valve is terrible and sticks easily. Mine will no longer open at all, even at 120 psi! I switched back to the "cheapo plastic" bubble counter that was included with my Aquatek regulator and it's working just fine at 40psi. This one looks pretty, but don't waste your money.
1519583
did not function at 80 psi or above, would not recommend this valve !
76997
Installed new unit.  Verified that the valve moved with no resistance.  As soon as valve is operational the brass gear on the motor started slipping on the brass valve opening gear.  The result was a loud snapping noise that repeatedly rang through the entire house continuously while the valve struggled to open.

Looked for an internal adjustment and found that the motor was held in place by a single screw and a folded piece of aluminum.  No adjustment was possible.  The entire internal frame was wobbly and poorly constructed.

I will be looking for a different replacement.  It is a shame since the older Honeywell valve were much more solid and had a far superior quality.
Since the valve wires were trimmed and I had to file the gasket plate from the old valve I do not think a return would be acceptable or worth the effort.

This is a product complaint.  The seller provided a prompt transaction.
736507
Installed the HC660 5 months ago. Had to replace it because it ran water continuously. The internal valve would not turn water off.  Obviously I'm not satisfied and will be returning it to Amazon.
25641
The hose I purchased ACP-400 has a defective valve. They will not do anything unless I remove it from the can of refrigerant VENTING IT INTO THE AIR, which is of course illegal as hell. Totally useless company if you have a defective product. I'm planning to drop it off at an auto shop maybe they can dispose of it properly.
4681288
Grundfos matched up a beefy caste iron pump with a cheap plastic valve.  The result: the valve stays in the open position for extended periods of time, i.e. 3-5 minutes and you have hot water with no cold water.  If you turn on the cold water only, you have to wait for the same period of time, 3-5 minutes for the water to change from hot to cold.  No water savings!!!

When I called Grundfos technical / customer service department to resolve the issue, they wouldn't replace the valve and said to deal with the wholesaler, PexUniverse.  PexUniverse said that they wouldn't replace the defective plastic valve with a new one unless I sent it back to them first and I was responsible for paying the shipping.  Terrible customer service on behalf of Grundfos and PexUniverse.  I remain an unhappy customer!!!!
2982855
The valve where the little hand pump on the first one leaked. The pad deflated within 5 minutes. I returned it for a replacement. The second one arrived. I read the directions again and repeated the inflation process. The hand pump didn't work at first. I had to hold the end shit and squeeze it really hard a few times to get the valve to engage. Then I blew it up by mouth, and sealed the main valve. Plugged in the hand pump and pressurized it. I could HEAR the valve leaking badly. Same problem as the first one, but far worse. I worked the button in and out a few times, then pushed it in and let it go. It broke off under the spring tension and flew across the room. Ruined within five minutes. This was for a long term bicycle tour. I'm really glad I didn't take this with me. I never even got a chance to see if it was going to be comfortable. The valves looked and felt cheap, and it just didn't work. These are garbage from what I've seen. I won't be trusting this brand again. It seems their quality control has some serious issues. The materials in the valve seemed very cheap. Not sure if the design is any good. Good design with poor materials still makes for a poor product. Highly recommend against it.
4047643
Functionality trumps this faucets visual appeal, so therefore don't purchase this pretty little lemon. Right out of the box and installed upon first use, it leaks from the pull down hose end. I followed all the instructions for troubleshooting, but unfortunately tightening the handle nut, didn't stop it from leaking. This will get returned for a full refund to the seller on Amazon. People, trust the 1 star reviews on here...I should have known better...my father always told me to look at the 1 star reviews BEFORE you purchase anything. Lesson learned...the hard way.

UPDATE 1 day later. So I'm a little bummed I had to purchase a replacement valve cartridge (RP50587) for $30 extra $...but it no longer leaks anymore! Yeah!!! I increased the rating from 1 star to 3 stars...because I'm not sure on the durability of this part and if it becomes an every 6 month replacement piece...then it'll drop back to 1 star or if it holds its own and no more leaks than it'll rise up to 5 stars. Thanks.

Update 2 days later. The sellers response to my purchase problem is what boosted this from a 3 star to 4 star. Ampersand Market actually paid me back the $30 difference in part RP50587 valve cartridge. Awesome service. Still no leaks after this part was replaced.