At NTI, we manufacture all of our boilers to the highest industry standards. Our in-factory Quality Control tests are the most rigorous in the industry. Every Tft boiler is factory run and calibrated for optimal performance. Our limited warranty provides you with the assurance of years of worry-free operation and our Technical Support is second-to-none in the industry..NTI boilers are built to last a lifetime! They come equipped with an advanced ignition system, and a top-quality heat exchanger.