6699 1/6HP Portable Utility Pump Submersible Small Backup Sump Pump Draining Tool to Remove Water from Flooding House Basement Pool Tankless Heater Flushing Pump with 10-Foot Cord SUB 1100

worked as advertised. Used to clean tankless water heater. Did a great job.

Worked great for descaling tankless water heater.

Powerful little Beast. Pump works Perfectly!!

I purchased this pump one year ago for tankless heater flushing. I wanted everything on hand for my first heater flush, so I set everything up. I placed the pump in a five-gallon bucket, filled it with four gallons of food-grade vinegar, and plugged it into the wall, but the pump would not pump. I heard a humming sound, then nothing. Why would it not pump? Update: I finally got the pump to work by unscrewing the outlet hose, placing the pump back in food-grade vinegar, allowing it to fill itself (or prime itself) with the vinegar, reconnecting the outlet hose, and plugging it in. It worked beautifully. The pump needs to be fully primed. One reviewer stated that the pump manual says "not to use vinegar" when using this pump, but my Rinnai tankless manual says to use food-grade vinegar. I'll keep using the vinegar as long as the pump works; just remember to flush it with fresh water afterward. I ordered another brand pump for backup. Would I buy it again? No. I don't recall any information on Amazon about liquids not to use with this pump.

I used this pump to flush two different brands of tankless water heaters (Rinnai and Takagi) and it worked perfect for both. For both of them, I put 3 gallons of vinegar in a 5 gallon bucket, dropped this pump in there, used a couple washing machine supply line hoses to make the connections, and that was it. One final note, since several other reviewers mentioned having to do different things to "prime" the pump (e.g. turning the pump on and off; unscrewing the hoses; etc)...I found that all I needed to do - after submerging the pump and plugging it in - was simply tip it to the side for about 5-10 seconds. You'll see and hear it sucking in the liquid (vinegar in my case) and then it immediately started pumping. Super easy.

This pump only worked once. I had running for 90 minutes then I shut it off for about 15 minutes and it never worked again. I followed troubleshooting and ensured there was nothing plugging or binding. Water I was pumping was crystal clear. The motor would run but not pump anything. Then it just stopped working all together.

Great unit for flushing our tankless water heater (1/6hp recommended). Competent and very reasonably priced.

This pump worked great. I submerged it in a 5gal bucket with a vinegar mixture to flush two tankless water heaters. The flow was perfect for that, maybe even a little over kill. Between both jobs the pump ran continuously for several hours with no issues.

very good product

Good water pump for tankless water heater flushing. I bought this pump to flush my Navien NPE 240A for the first time after 11 years in service. It worked nicely with no issue. No need to prime, as some other reviews mentioned, as long as the pump is fully submerged in water/solution.