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The Dunkirk Helix VX gas-fired, wall hung modulating condensing boiler is Energy Star 2018 Most Efficient. 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.
¹ 1000 Btu/hr (British Thermal Units Per Hour)