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DHW - Airlock or something else?
Have a 30 gal domestic hot water tank fed from my home furnace. This season I keep running out of hot water. When I investigate it seems the taco-007 Circe that’s right in front of the heater intake is airlocked. The motor itself feels very hot and i have hot pipe on furnace side and cold on tank side. What I end up doing is opening a drain that is on the return pipe from the tank to the boiler. Sometimes I need to play around with things like shutting the valve after the drain that goes into the boiler.
This doesn’t happen on any of my other 7 (yes 7 zones!) taco circs. I do have some air bleed mechanism that I can hear release air. I am tempted to get a replacement cartridge for the circulator. But someone told me the coil is bad and I should just get a regular gas fired water heater like everyone else.
Any suggestions from people who know this type of system?