Not impressed by this product.
I have used this product for the past 3 years in my Peerless 3 section boiler.  This is the 4th year I am adding the product according to directions.  I use the full bottle.<br />As my photos show,  the inside of a Honeywell zone valve and a Taco 007 pump are coated with a black film.  I was under the impression this product kept the system clean and lubricated.  The little water I drained out of the system when changing the pump and zone valve did not look dirty.  Slightly brown.  I don't think this is a good boiler cleaner.  But I do like the idea of a silicone lubricant kept in the system throughout the year.<br />I have no way of telling how bad the pump and valve would have looked if I had not used the product, or had I used a different product.
Rating: 2 stars