BROTJE (Earl) wall-hung boiler is a German high-end brand just introduced to China by Hildre, and its heating effect can be said to be the best among wall-hung boilers, especially its expertise in condensation technology. At the same time, Earl also adopts Al-Si alloy material with excellent corrosion resistance and thermal conductivity, which greatly improves the thermal efficiency of the equipment and reduces energy consumption. Moreover, the life cycle of the equipment after anti-corrosion treatment is obviously prolonged, and the emission is also minimized. Compared with the traditional wall-hung boiler, the energy-saving effect is about 20%.