Weil-McLain’s Eco Tec high-efficiency boiler is available in combi versions with response time and domestic hot water output designed for residential replacement applications. The boiler, which features a long-lasting firetube heat exchanger, is easy to install, use, and service, the manufacturer claims, and operates quietly, with a 95% AFUE rating. The combi versions are available in 110, 150, and 199 MBH with hot water output up to 5.4 gallons per minute. The product includes built-in zone control and connects up to four thermostat inputs. Pricing varies by distributor. weil-mclain.com