1.QUICK 850A ESD (Simple design)

2.QUICK 850A+ ESD (Thermostat)

3.QUICK 850AD ESD (With air meter)

1.QUICK 850 ESD (QUICK 850B ESD)

2.QUICK 850+ ESD (Same as thermostat QUICK 850ESD)

3.QUICK 850D ESD (Thermostat, digital display)

1.BETTER 850 ESD (More simple design, more perfectible price)