Variable Voltage vs Variable Wattage Devices
    Essentially, the difference between variable voltage and variable wattage is a bit like the difference between an automatic and a manual car. With a variable voltage device you manually control the amount of power (voltage) going through your device.

The amount of energy that is actually output will depend on how the resistance of your atomiser interacts with that power flowing through it. With a variable wattage device, however, rather than telling the device how much power you want to flow through your atomiser, you tell it how much power (wattage) you want it to output. The variable wattage device will then automatically adjust the power going through the atomiser (the voltage) to produce the power output you need (the wattage).

To put it another way, watts is essentially how much power the e-cig produces and voltage is how much power is put through the device. So, as you increase the wattage the voltage also increases and vice versa. Voltage is not the only factor which affects wattage – you also need to take into account the resistance of the coils. Lower resistance coils produce more flavour, vapour and heat at a lower voltage than higher ohm coils because they use more watts.

For example, if you have a 1.8ohm coil running on 3.7 volts you’ll get an output of around 7.3 watts – a decent vape. However, if you change the coil to a higher resistance of 2.8ohms you will notice a considerable decrease in flavour, vapour production and heat, as the wattage will be lower (around 4.4 watts) and you will need to increase the voltage to increase the wattage and thus get a better vape.

Because lower resistance coils use more wattage, they tend to generate more heat and can burn out quicker than a higher resistance coil would.