Temperature paint.
A recuperator is a device which makes additional use of the energy of exhaust gases, which would otherwise be lost through the chimney. In practice the recuperator is a heater, which is installed between the boiler and the chimney. The waste exhaust gases at a temperature of 220° C are conducted through the recuperator and keep heating the supply water of the steam boiler or feedback water of a hot-water boiler. Consequentially the exhaust gases cool off, while the supply or feedback water is additionally heated, which means approximately 5 % of additional efficiency for recuperators of type I totalling to 95 % (applies to steam boilers). Recuperators of type I are made of steel, while additionally a stainless steel recuperator of type II can be integrated, which brings approximately another 3 % of savings totalling to 98 % (applies to steam boilers).
