Boiler Protection Valve

Install 2 inch boiler protection valve on twin boiler install… Very concerned about boilers condensing this valve works great in addition to a hydraulic separator. I’m very pleased with the valve.

Quality product, nicely assembled and timely delivery. Unbeatable price too! This switch exceeds in rating and will perform in many applications.

I have received my boiler at the date I have asked for and in perfect condition since it was properly packaged and protected.

Used this flow switch to detect flow that a traditional mechanical flow switch with paddle was unable to detect reliably. The only challenge was during installation. I had to use a reducer to fit this 1/2-inch threaded flow switch into the 1-inch fitting that the old mechanical switch used. The threads on the new 1/2-inch flow switch are NOT tapered, whereas those on the 1-inch to 1/2-inch reducer were tapered. I had to re-tap the reducer to remove the taper and have the new 1/2-inch flow switch thread all the way in and seal. A nuisance that delayed installation as I had to find and purchase a 1/2" by 14 NPT tap, which was not cheap. Once the new flow switch is hooked up electrically, you can adjust the trigger point to the application. In doing this exercise, I realized just how variable the flow was from my supposed constant-flow recirculation pump. Nonetheless, using the new flow switch's LED scale, I was able to accurately tune the system to trigger upon flow detection and remain triggered during circulation pump operation. Overall, this 1/2" flow switch was cost-effective (it was offered a promotional price when I purchased it), appears appropriately sensitive, and will hopefully prove reliable. Based on early use to-date, I would recommend this flow switch. I will wait to see whether the unit is reliable before I give a full endorsement.

Valve was easy to plumb in once I understood how it worked. Did not come with any kind of instructions, MBtek website has a diagram of how this worked. Basically, AB port goes to the boiler intake (mixed water), and the water exit (heated water) gets piped to B port this forms a loop until the mixing valve begins to open A port (cold water). This prevents the boiler from running to cold which can cause an acidic condensate from the pellets burning, which over time will eat your boiler from the inside out. Be sure to install this to protect your investment.