I'm running my system on oil for the moment. It is a parallel arrangement. I'll put in a diagram, but I haven't updated it-the buffer tank supply is now on the top.
I have the oil boiler's B&G Ecocirc Vario pump set at it's max setting. When the boiler comes on to charge the tank, the two heating zones heat up to some degree, without their circ pumps running. When the boiler return temperaure is low, ie, below 130F, I can feel the Caleffi thermomix working since I can put my hand on the return. I think the buffer tank top is also getting some heat. There might continue to be a little heat coming up after the pump turns off, but not muh. What causes this?
I am thinking it's convection, and unavoidable. There are flow check valves on the supplies to the zones and check valves after each boiler and before each supply hits the supply header. This flow is in the right direction though.
Could the pump's high setting be a factor? It's not like it's huge.
Bottom line, I don't think this is going to be a big issue, but still would like to know if this is a common phenomenon.
![Heat Going In Unexpected Places: Ghost flow, convection high pump rate, normal, unavoidable?? Heat Going In Unexpected Places: Ghost flow, convection high pump rate, normal, unavoidable??](https://www.hearth.com/talk/data/attachments/141/141346-73a6d10d60441fe06dc83012e44920ff.jpg)
I have the oil boiler's B&G Ecocirc Vario pump set at it's max setting. When the boiler comes on to charge the tank, the two heating zones heat up to some degree, without their circ pumps running. When the boiler return temperaure is low, ie, below 130F, I can feel the Caleffi thermomix working since I can put my hand on the return. I think the buffer tank top is also getting some heat. There might continue to be a little heat coming up after the pump turns off, but not muh. What causes this?
I am thinking it's convection, and unavoidable. There are flow check valves on the supplies to the zones and check valves after each boiler and before each supply hits the supply header. This flow is in the right direction though.
Could the pump's high setting be a factor? It's not like it's huge.
Bottom line, I don't think this is going to be a big issue, but still would like to know if this is a common phenomenon.
![Heat Going In Unexpected Places: Ghost flow, convection high pump rate, normal, unavoidable?? Heat Going In Unexpected Places: Ghost flow, convection high pump rate, normal, unavoidable??](https://www.hearth.com/talk/data/attachments/141/141346-73a6d10d60441fe06dc83012e44920ff.jpg)