Oatey 30115 Hercules Boiler Liquid Stop Leak, 1-Quart

7/20/22our boiler would leak 40 gal overnight. for the last 2 weeks i only ran it when we took showers, and would shut the water feed off right after. I'd still have about 20 gal on the basement floor after a few days. the internal leaks started messing with ignition and i had to constantly reset the control. i thought I'd give this a shot to help us limp this furnace 2-3 months till the new furnace is in.poured it in, got the boiler running, let it go overnight, it stopped the leaks completely and I'm amazed. i will come back and update how long it lasts, but I'm hopeful from reading other reviews.update: 8/10/22 after 3 weeks, a small leak has reappeared today, but only about 6 gal leaked in 24hrs. going to try another quart.boiler replacement is a month away, so we're just trying to limp this. $10 got us 3 weeks leak free.

I am so grateful for this stuff. I had an absolutely terrible leak from the water tank into the firebox and it wouldn't hold the hot water. I was between having to spend hundreds on having someone weld my stove and having to get another one. Someone on a facebook group recommended this and it fixed my leak almost immediately. Thank you!

Went from 1 qt a hour leaking from my boiler to just under a cup a hr. Replacing boiler in the spring, just hope it goes till then

MY P))SPA IS OVER 20 YEARS OLD. OVER THE PERIOD, VERY GRADUALLY, A SMALL LEAK BECAME WORSE. MY "SPA" GUY SUGGESTED 2 SOLUTIONS: (1 ) ORDER A QUART BOTTLE OF THIS OATEY 3115 PROFESSIONAL LEAK STOP FOR HIGH TEMPERATURE BOILERS AND VERY HOT WATER. MY SPA TEMP IS SET AT 100F . ( COLD BY ANY COMPARISON). OR (2) HAVE A CREW PULL THE SPA OUT OF THE GROUND AND REPLACE THE TROUBLESOME PLASTIC VALVE. TO DO THAT WOULD BE QUITE EXPENSIVE AND TROUBLSOME.. OPTION (1); THE OATEY PRODUCT WAS ORDERED AND POURED INTO THE SPA. ( NO SPECIFIC INSTRUCTIONS WERE PROVIDED). I LET IT CYCLE IN THE SPA FOR 4 DAYS. THEN DRAINED ALL WATER AND WAXED THE WALLS; THEN REFILLED WITH CLEAN WATER AND A NEW FILTER. ***** WORKED!!!! NO MORE LEAKS.

I was actually quite skeptical when I made my purchase. I have been disappointed many times by " quick fix " type products in the past. I was pleasantly pleased to discover the this product ACTUALLY WORKED as it claimed. My boiler had a small leak that was in a bad spot to physically repair without opening a huge Can of worms( total disassembly of boiler) . I followed the directions to the letter ( important) and low and behold the leak was stopped, saving me many hours of back breaking, ball busting work. Highly recommended!!!!

Had a couple of seep leaks in my system and put this in as instructed ran all winter with not one drip!My new go to conditioning for my hydronic boiler

My hardy had developed a small leak , causing me to shut heater down , after adding 4 quarts to H2 hardy leak stopped over night and has been leak free for over two months now .

use product in my water stove. Sometimes it works right away. Sometimes it may take a couple of days. It was leaking at least 3 gallons a day. It is now down to a gallon a week and chances are it will completely stop soon. Just holding off before putting in another quart.

Quick delivery, good instructions on bottle, worked within hours to stop small leaks on copper boiler lines.Used very little.

Simple and took care of the issue in my boiler

Took a long time to come. Seemed to slow down leak though

I used 1 quart of it and it stopped the leak in my boiler, happy happy

Used this product to seal some weld pinholes in a new build scale steam boiler.Hydros to 300 psi after using following directions carefully. Used at about 30 to 1 with water.Boiler has to be hot for this stuff to do its job.