Hi, I join from Turkey and Firstly i want to say sorry about my english.I will try to tell you my question. 
What is important for formaldehde ? Watt or voltage ?
I am going to ask you with a example.
For example we have two coils and first coil is 1 ohm and coils' volume is 6mm^3
second coil is 0,5 ohm and same volume.
These coils works fine same watt. But it calls different voltages. what is the important ? same temperature and watt or voltage?
What is important for formaldehde ? Watt or voltage ?
I am going to ask you with a example.
For example we have two coils and first coil is 1 ohm and coils' volume is 6mm^3
second coil is 0,5 ohm and same volume.
These coils works fine same watt. But it calls different voltages. what is the important ? same temperature and watt or voltage?