For commercial applications, Bosch offers its high-performance Therm C 1210 ESC tankless water heater that provides up to 98% thermal efficiency. The gas-fired condensing Bosch Therm C 1210 features a space-saving design, affording easy service access. It can be cascaded using up to 24 units to satisfy requirements up to 240 gpm for jobs such as tank loading, solar thermal recirculation, radiant floor and space-heating applications. Its condensing heat exchanger captures heat from exhaust flue gases and uses the latent heat to preheat incoming cold water, increasing each unit’s efficiency up to 10% over noncondensing models. Venting options include direct, vertical or horizontal and PP common venting of up to four units. Available in both NG and LP models.