Utica’s SSV gas-fired, wall-hung, modulating-condensing boiler is Energy Star-rated Most Efficient 2014. All capacities are 95% AFUE with a 5:1 turn-down ratio. The SSV features the original vertical, patent-pending heat exchanger design. This low maintenance, self-cleaning heat exchanger was designed in the United States to withstand up to 150 psi MAWP. The SSV is approved for PVC, CPVC and polypropylene venting and comes with a 15-year limited manufacturer’s warranty and a first-year $500 heat exchanger labor warranty.