“I replaced the electric boiler in my basement due to some heating issues. It only ran off off-peak power (10pm to 6:30am), and it would start running and then shut off after about 45 minutes. The old Taco unit LOOKED okay and had no visible blown fuses or relays, but I replaced it at the advice of the boiler company, and SURE ENOUGH, that was it!”
“Bought and installed it all on my own. Tech was charging way too much and tried to make it sound really complicated to install. Took about an hour to install. I have 3 zones and all is working well. Love that I can now see the lights so I can know exactly which zone is calling for heat. Looks very sturdy and also comes with some extra fuses in the box a huge plus.”
“This product looks better quality made than the 503 EXP version we had that came with our boiler when we purchased it. Just hope it lasts longer and is more reliable than the old one. The PC board burned up in the old one causing the furnace to run and stop every 5 minutes.”
“I purchased this unit and it arrived in less than 24 hrs. It saved me time and a lot of aggravation. It is so simple to wire your connection and the price was the best, no matter where I looked.”
“I have a radiant heat system that had some water leak from the backflow preventer and shorted out my current SR504 module from Taco. This was installed circa 2003 and had big "ice cube" relays. It also looks like the picture (as of this writing). The new one (this one”
