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Honeywell Home

AQ25400B/U

Aquatrol Add-a-Temperature Expansion Control Panel, is used for expanded zone control and mixed loop temperature control in a Hydronic Zoning System

DISCONTINUED. This product is out of production.

This product is being phased out. Available while supplies last. No direct replacements are available, but you can

Honeywell Home

AQ25400B/U

Aquatrol Add-a-Temperature Expansion Control Panel, is used for expanded zone control and mixed loop temperature control in a Hydronic Zoning System

DISCONTINUED. This product is out of production.

This product is being phased out. Available while supplies last. No direct replacements are available, but you can

Honeywell Home

AQ25400B/U

Aquatrol Add-a-Temperature Expansion Control Panel, is used for expanded zone control and mixed loop temperature control in a Hydronic Zoning System

DISCONTINUED. This product is out of production.

This product is being phased out. Available while supplies last. No direct replacements are available, but you can

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Honeywell Home

AQ25400B/U

Resources Specifications Overview Parts & accessories Replacement products

Technical (0)

	Title	Date Posted	Size
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Sales (3)

Title	Date Posted	Size
Resideo Hydronic Heating Solutions Brochure (English)	07/2021	4674780 kb	Download
Resideo Hydronic Heating Solutions Brochure (French)	07/2021	4456147 kb	Download
Aquatrol Hydronic Controls	10/2001	1642369 kb	Download

Submittal (0)

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Training (0)

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Install (2)

	Title	Date Posted	Size
	Product Data for AQ250 Series Hydronic Control Panels (English)	05/2025	1673070 kb	Download
	“Add-A-Temperature” Expansion Control Panel	10/2009	1680267 kb	Download

Application	Expanded zone control and mixed loop temperature control in a hydronic zoning system,Mixed loop target temperature is reset by either outdoor temperature or calculated system load based on indoor temperature feedback,Mixing is target controlled by a varia
Approvals and Standards	CSA C/US Certified to CSA and UL Standards, File No. LR76030
BB - Com Terminal	Low Voltage \| Class II \| 2-Wire polarity-insensitive \| Digital Communicating Link to other Control or Zoning Modules
Mixing Valve Floating Output	24 V AC Rated Dry Contacts
Output Rating	Auxiliary Pump: Dry contact output, 120 V AC/250 V AC 5 A/ 1/3 HP
Compatible With	AQ1000 Series 2-wire thermostats \| Most digital thermostats
Warranty	2 Years
Product Depth	3.38 in \| 8.5 cm
Product Height	8 \| 20.3
Product Weight	3.9 \| 1.8
Product Width	9.4 \| 23.8

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Functional Replacement (1)

Image	SKU	Name
	s-aq25044b-u	Aquatrol Boiler Control Panel, with DHW priority, for 4 zones of 4-wire valves (with end switches), used in Zoned Hydronic Systems	Sign In to View Pricing

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