The Aquatrol AQ2000 Series controls from Honeywell are designed to significantly reduce installation time and simplify the control of hydronic heating systems. AQ2000 Series controls come pre-programmed with the most commonly used system settings, while expansion panels provide contractors and designers with system design flexibility. With the AQ2000 Series Zoning expansion panels, users can control up to 16 zones. The AQ2000 selection tools are available both in print and online. By answering four easy system questions, users can quickly download the right configuration of controls for any job, including suggested piping and wiring diagrams. Honeywell. Circle 9.