zone valve

Hi, I have gas baseboard hot water heat with two taco zone valves. One zone in particular makes a loud knocking noise whenever the thermostat calls for heat. The noise is coming from the first part of the zone right where the zone valve is. I've been in the house for one full winter and I've...

Hi All! I've gotten a crash course over the last 2 months of owning an old Victorian style home in Rhode Island, seems like everything is going wrong with this heating system. So a quick description of the heating system: there are a total of 6 zones coming off of a Slant Fin S-120 DP. 4...

Hi all, I currently have a single 24 V transformer powering 2 Taco zone valves. The transformer is marked as "40 VA", which means it has a current rating of 1.66 Amperes. The problem is that I believe my Tacos have the older 0.9 A power heads; not the modern 0.3 A heads. If that's true, that...

I own a condo in a commercial building that uses chilled or heated water (depending on season) in the HVAC. The controlling valves in my two systems are Honeywell: 120 VAC, two position zone valves with aquastats, and both have failed. I was able to locate one powerhead,part number 40003916-045...