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Honeywell AQ25042B

4-Zone Boiler Relay Panel for Pumps or Zone Valves WITHOUT End Switches


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The AQ250 family of AQUATROL Boiler Controls provides simplified, energy-efficient control of single temperature, residential hydronic heating systems. The AQ250 easily converts a single zone heating system into a room-by-room comfort control system, or upgrades a basic, relay-logic zoning system to intelligent Zone of Greatest Demand control for increased energy efficiency with reduced boiler cycling. AQ250 boiler controls can ensure ample supply of hot water for both space heating and priority generation of domestic hot water for bathing, dishes and laundry.


  • Factory configured for control of up to four zones plus domestic hot water.
  • Expandable up to 16 zones with expansion zoning modules (sold separately).
  • Single stage boiler control synchronized to zone-of-greatest-demand.
  • Reduced boiler short-cycling.
  • Integral Domestic Hot Water control.
  • Installer selectable DHW Priority.
  • Installer selectable DHW Priority Override

Note: Honeywell AQ Zone Panels require the Honeywell AQ1000TN2 for the system thermostat, and will not work with standard thermostats.


The number of interior air handlers connected to the condensing unit. Typically one, two, or three zones.

Product Weight
4.9 lbs
13 Inches
3 3/8 Inches
8 Inches
120 Volts
60 Hz

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.