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While a lot of attention is paid to efficient boilers and innovative radiators, the design of the piping system is often what makes or breaks a hydronic heat system. A good piping system can be the difference between a noisy, uncomfortable, energy-wasteful system, and one that brings even comfort to all the rooms in a house. To design an efficient system, you must match the heat source to the "heat emitters" — that is, radiators and convectors. Some types of heat emitters are best suited for relatively high-temperature heat sources. For example, the familiar finned-tube baseboard convectors, used in many residential and light-commercial buildings, work well with water temperatures above 150°F, but