A boiler with 4-pipe capabilities has a separate circuit for both radiator and hot water tank heating. With the 4-pipe system the boiler will continue to deliver high heat levels to the hot water tank, but when heating radiators, the intuitive "weather compensated" controls will deliver a varied water flow temperature to the radiators based on the outside ambient temperature. This allows for maximum condensing to take place during radiator heating intervals, thus reducing gas consumption significantly. These boilers are built to a very high standard and offer a 5-year parts and labor guarantee. |