Name: Dunkirk
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Modulating Condensing Gas Boiler

The Dunkirk Helix VX gas-fired, wall hung modulating condensing boiler is recognized as the Most Efficient of ENERGY STAR® 2020. All capacities are 95% AFUE with a 5:1 turn down ratio. The VX features Dunkirk’s innovative vertical, patented heat exchanger design, Patent No. 10,012,413 . This low maintenance, self-cleaning heat exchanger was designed in the U.S. for the U.S. to withstand up to 150 psi MAWP. The VX is approved for PVC, CPVC and Polypropylene venting and comes with a 15-year limited manufacturer’s warranty plus and industry-leading first year $500 heat exchanger labor warranty.

Efficiency: Energy Star Most Efficient Rated
Capacity: 50, 75, 100, 150 and 200 MBH – All Dunkirk Helix VX capacities are 95% efficient and recognized as the Most Efficient of ENERGY STAR® 2019.
Patented Heat Exchanger: Stainless Steel, Patent No. 10,012,413
Combustion: Sealed Combustion
Venting: Direct Vent
Boiler Type: Hot Water
Wall Mounted: Bracket included.
Boiler Control Module: Automatic Low Voltage/Intermittent Direct Spark Ignition/Modulating with a 5:1 combustion turn down ratio. For multiple boiler applications – the control module can stage up to 16 boilers.
User Display interface: Easy programming with text display. Outdoor Temperature Sensor included. Heat Exchanger: High grade 316L/444 Stainless Steel Fin Coil with Flame Sight Glass.
Combustion: Gas Valve with Premix Venturi and Blower, Durable Stainless Steel Mesh Modulating Burner with 5:1 turn down ratio, Direct Spark Igniter, Flame Sensor
Electrical: Low Voltage Terminal Strip, High Voltage Junction Box and Transformer. Other: 30 PSI Safety Relief Valve, Boiler Drain Valve and Condensate Drain with built in trap.

Concentric Vent Kit (2″ and 3″)
System Sensor (For Multiple Boiler Applications)
Optional Floor Stand
LP Conversion Kit

Brochure

Helix VX Brochure Rev. 1-15

Helix VX Brochure Rev. 1-16

Helix VX Brochure, Rev. 6/16

Helix VX Brochure, Rev. 1/17

Helix VX Brochure, Rev. 9/16

Helix VX Brochure, Rev. 1/18

Engineering Documents / Resources

Helix VX Tax Certification Statement Rev. E

Installation & Operation Manual

Helix VX IOM Rev. B

Helix VX IOM Rev. E

Helix VX IOM Rev. C

Helix VX IOM Rev. D

Helix VX IOM Rev. F

Helix VX, IOM, Rev. 4/16

Helix VX, IOM, Rev. 9/16

Helix VX, IOM, Rev. 3/18

Parts Lists

Helix VX Parts Rev. C

Helix VX Parts Rev. B

Helix VX Parts Rev. A

VX, Parts List, 4/16

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Modulating Condensing Gas Boiler

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