A couple comments: The specs @gsmith22 posted do indicate lower pumping power than reported, but there are numerous posts on here reporting pump wattage at about 245W for a single 26-99 pump. I'm not sure where the difference comes from. While I would have also said the pumps are not inside the units, one of her units is a 506A11 outside packaged unit. Looks like these are available with flow centers pre-installed inside the cabinet. Options are for none, single, or dual-pump flow centers. Looks like these have one or two 26-99 pumps in them. The Waterfurnace model number should indicate what's installed. For the other (500A11) unit the flow center should be outside the unit, as @gsmith22 described. I'd guess that each unit has a single 26-99 pump, but looking at the part number on the pump in the flow center is the best way to positively identify what's installed. Based on the reported pipe diameters and loop sizes, I don't think there should be a problem getting the required water flow unless the supply/return lines are extremely long. If you have the monitoring package, I believe it will report the loop flow in GPM. It's not easily accessible for the user though.