Product details:

Bell & Gossett .54 starNeed better instructions on how to set.December 3, 2012High efficiency boilers need this product, or one similar. Problem is, the instructions to set it correctly seem hard to follow the first time. It became a lot of trial and error to set correctly, and I had to go back several times. Maybe it is my fault though. The Friendly Boiler Man SupplyHouse.com