The Embassy Peak 40 gas-fired, combination boiler is a 95% efficient condensing heating boiler that also offers domestic hot water production. Available for natural or LP gas, the Combi boiler is ENERGY STAR® certified and provides up to 4 GPM of domestic hot water production. The direct vent boiler utilizes 2" or 3" piping in a variety of materials including PVC, CPVC, Polypro and AL294C and is environmentally friendly with LoNox and low CO2 Emissions.