I just checked with DH; he's an HVAC service tech who has installed numerous Buderus systems. He said Buderus is a great top of the line system and price varies significantly based not only on the system you are having installed but what else they have included when pricing the install of your system. Does the price include new oil tank or baseboard, etc. Price varies significantly also based upon the size of your house and what they have to do to get the system into your house; do they have to remove multiple systems and re-wire? Is your house larger requiring a larger system and more pipe? His recommendation, get two or three price quotes from various installers.