Recirculating Pump, 93W Water Circulator Circulating Pump NPT 3/4" w/NPT 1/2" Adapter, 15-6C 3-speed Control Recirculation for Electric Water Heater System

I originally ordered the 15-9S pump, thinking I needed the volume for my water heater recirculation system. Forewarned being forearmed, I ordered the BSP (or G) to NPT 3/4" adapters, as I needed 3/4" feed out of the water heater, so I didn't want to use the 3/4" to 1/2" adapters that came with the pump. With the adapters, I had no leaks and no problems, certainly none of the problems that some have reported. I used minimal teflon tape (4 wraps or so), and the rubber gaskets that came with the fittings with no issues. The problem I did run into was the pump was more than I needed. It is rated at 120W at 30L/min, and I felt like the 15-9S was noisy. I could hear it through my garage wall, although my wife could not. With a circulation system that is fully insulated from the water heater through the house and back, all I needed was a trickle, so I decided the 15-6S with the stainless pump and multiple speeds was what I needed. I contacted the ZeroPone customer service and asked if there was a chance I could exchange the 15-9S for the smaller one I wanted, even though I was 4 months from the purchase date. (The extenuating circumstance was I was building a house and it was over 3 months before I could actually run the pump.) Not only did they agree to send me a 15-6S pump, they gave it to me with no return of the 15-9S necessary! It took me a while to get to installing the new pump, but it is whisper quiet and supplies more than enough hot water through the house, now at 40W instead of 120W. As another reviewer noted, there is no off switch, so I installed the pump on a smart plug and I have Alexa turn it on in the morning and off late at night. At 60 feet from the tank, it takes under 8 seconds to get hot water at my guest bathroom sink, and the shower is virtually instantly hot. I wish I could give it 4.5 stars and not 5 (Their customer service deserves 10!) only because the headline description clearly states NPT threads when it is not. Lower in the post of the pump, however, in the Q&A drop-down sections, it clearly states it is BSP threads, but you have to go looking for that information. I highly recommend this pump and this company, with the caveat of needing the correct adapters, also available on Amazon. The adapters can clearly be seen in my photos. The short video is only to give a sense of how quiet this pump is: I cannot hear it at all, although the water movement or my check valves cause a little noise. For the great comfort this little pump gives, at the purchase price and cost to run it, I'll put up with a tiny bit of noise!

Worked for me out of the box. It's surprisingly super quiet, was not expecting that. It's installed in the garage and I can barely hear it, if i cant hear it at all, standing next to it. Very very faint hum. Plugged it into a wifi smart outlet thing for control. Comes on between 6am and 10am, and 7pm and 11pm. Instant hot water in the whole house during that time. Seems pretty durable, no issues yet. Been about 6 months or so, on the same schedule.

After reading the reviews on this pump, I bought this to replace a noisy pump that was starting to fail. Taking advice of people who recommended using standard garden hose washers, it installed easily and I had no leaks. I set it to the medium setting and it works great! Nice and quiet. Great price too! I did install a timer too so it only runs between 4:30am and 10:30pm, the hours I’m usually awake.

This pump is complete junk and a huge disappointment. It started leaking in less than a year after installation, which is completely unacceptable for a component tied into a home’s water system. By the time I noticed the issue, there was already about an inch of water along the wall in my basement mechanical room. I was extremely lucky to catch the leak just one day before leaving for vacation, or the damage could have been severe. I had to make an emergency trip for plumbing parts just to remove the pump and reconnect the pipes where it had been installed. Poor quality, unreliable, and absolutely not worth the risk. One star.

Model 15-6s I have a heating coil attached to my pellet stove I use this pump to circulate water between those coils and my hot water tank. It works great. I did two things wrong when I installed it. I had the shaft pointing up and I also didn't bleed it. Yep I burned it up it took about a week. However, I did like the pump so I ordered two more one for a backup. -the brass fittings are a bit cheap/ lightweight they may not even be brass. This is what I took the one star off for. I will be ordering better fittings the exact same ones of better quality. - those same brass fittings seem like they have a solder connection but they don't the application is threaded only. If you apply a bit of pipe dope to the rubber washers the threads go together quite easily. I had no problems with leaks my uninstalled and installed this thing probably 10 times. - bleed screw o-ring is a royal pain in the butt. However it's manageable once you figure it out. I just relieved quite a bit of pressure before I tried to bleed it. If you don't the o-ring doesn't seat properly due to the water pressure blowing it off its seat.

Seems to be surprisingly good quality however the unions provided are too large to solder onto 1/2 copper pipe. You have to use a half inch female adapter or some other type of threaded fitting. The little pump pulled that hot water around the entire 2000 square-foot house very quickly and operates fairly quietly. Overall I'm happy!

So my home comes with a hot water circulation system. What this means is that it’s constantly pushing hot water throughout the house in a circular motion through the pipes so that whenever you turn the hot water on a faucet, you have almost instant hot water. The initial pump that was installed when the house was built I presume, we didn’t build the house, was a much smaller pump that was mounted on plastic waterlines that ran down the side of the water heater. The way this was initially gave me nothing but problems with the pipes busting on several occasions. So I decided to give this pump a shot, had to buy a little bit of additional hardware to get it to fit just right, but was able to mount it directly on top of my water heater into my circulation system. Now works perfectly and I’ve not had a problem since. The motor and the pressure it provides are so strong that I actually only use it on the lowest setting because it works so well. The only regret or negative comment I would make, is that I do wish I would’ve went ahead and spent a few more dollars and bought the model that has the stainless steel housing as opposed to iron. I’m sure due to irons rusting nature, the model I purchased is not gonna last quite as long. I suspect the motor will end up outliving the housing. Nevertheless, they’re pretty inexpensive to replace, fairly easy to install, and I would definitely recommend.

Has installation requirements that limit how it is installed. Has different features that are not well described, trial and error. Gets hot. Operates very quietly. It has worked well ( for about two months).