My EKO 40 is in a small 10x12 outbuilding feeding my 500 gallon storage tank in my basement. I also have another line from the boiler going to my shop. In my shop is a forced air furnace with a WAHX installed. I've noticed my spirovent dripping water and removing air. I actually have three spirovents in the system. One at the boiler, in the shop and in my basement. The only one doing this is the one in the shop. The shop is located uphill from the house and boiler. Approximately 10' elevation change. Water pressure is 15 at boiler and slightly more in the basement where the make up water is. I think my problem is how I installed the circulator in relation to the motorized ball valve and spirovent. The pump is actuated off the contacts in the motorized ball/zone valve. I am pumping away from the spirivent which I think is causing low pressure especially when the valve closes slightly before the pump shuts off. The gauge pictured is attached to bottom of spirivent and is about six pounds when system is on. The gauges drops to zero when shut off. If I close the valve between the pump and spirovent the gauges reads 10.