Laars’ outdoor NeoTherm is a direct-vent sealed-combustion condensing boiler or volume water heater specifically designed for outdoor installations. These systems, Laars notes, meet or exceed all applicable ANSI testing demands for outdoor use and reach thermal efficiencies as high as 97%. The NeoTherm features an ASME stainless steel heat exchanger, direct-spark ignition system, low NOx emissions and modulation with a 5:1 turndown. The NeoTherms are natural-gas- or propane-fired and come in eight sizes with ranges from 150 to 850 MBH.