1.Electrical boiler has a small size, high efficiency; 2.energy-saving, no noise,easy to be installed; 3.a new ... , simply open the cold, hot water valve,the system will switch to hot water automaticaly, which is operated simply;D: Internal ... , making timing, burning, fan and showerF: Anti-freeze protection, Pump-card function of stagnation,Pump bypass protection, Proof-high-pressure protectionG ...