“Direct replacement for unit on our Peerless oil burner. Old one showed Err4. Troubleshooting revealed incorrect voltage on B1, meaning the unit was bad. Replaced with this unit. Easy install—moved one wire at a time. Boiler fired up immediately.”
“Furnace Aquastat failed on a holiday weekend. No HVAC supply stores open. Ordered Saturday night, received it Monday morning (Labor Day), installed and programmed within an hour. Heat and hot water restored. plumbingsupplyandmore speed and service were exceptional!”
