Triangle Tube has announced the availability of the all-new modulating Delta. The modulating Delta is a gas-fired, fully modulating, sealed-combustion combination heater. It provides efficient, comfortable hydronic heat, while simultaneously provides an abundant supply of domestic hot water. The Delta is available in two sizes: the PG-150 modulates from 90,000 to 150,000 Btu/hr, and the PG-199 modulates from 135,000 to 199,000 Btu/hr. Both models have an AFUE rating of over 85%. The Modulating Delta features a built-in microprocessor that constantly monitors the temperature of the heating water, domestic water and flue temperatures. The microprocessor also features a digital display that provides system information and error codes.