The YJ series liquid heater compact, easy disassembly, easy to maintain. 2 using SCM to achieve automatic process control, easy to operate, with a temperature control function. Heater inlet temperature control needs to achieve the dual-temperature range 60 ° C - 70 ° C, 65 ° C - 78 ° C water temperature and the overheating sensor imports thermistor, stable and reliable, sensitive control accuracy of ± 0.5 ° C. The 4 boot full detection, user-friendly design, LED flash code indicates that the heater working conditions. 5 judges fire: patented technology, acquisition no electrical signal, high sensitivity, consistency, and can reliably indicate the fire and controlled shutdown. 6 heater with overvoltage, undervoltage protection, motors, solenoid valves, glow plug short circuit, open circuit protection, safe and reliable ignition sensor circuit protection to ensure that the heater. 7 heater main motor automatically buck starts, shorter ignition time required, and lower power consumption. The 8 operating voltage range, the glow plug and the main motor voltage regulator operation; suitable for use below 5000 meters above sea level. 9 highly efficient combustion chamber and the heat exchanger structure to ensure that the the heater combustion efficiency is more than 80%. 10 heater exhaust after Wuhan Institute of Annex Auto Body Professional test better than the engine even IV emission standards.