Williamson has launched its new FreeStyle® 155k Btuh input Wall Mount Gas-Fired Condensing Boiler. The FS-155 has an AFUE of 94.4% and is available in combi and heat only models. The FS-155 combi unit provides 4GPM of domestic hot water. The FS-155 joins Williamson’s current 80k and 120k Btuh input units. All FreeStyle models are available in combi and heat only versions. The FreeStyle is designed with a single-tube large diameter stainless steel heat exchange. A digital display control and 24 VAC thermostat relay are standard with each unit. The FreeStyle provides modulating combustion with a 10 to 1 turndown ratio.