# What should I take in account when using a more powerful triac?

I'm familiar with simple dimmer circuit, now I want to build a more powerful triac unit to use with a high power heater.

The resistance of my heater is made of 9$\Omega$ 3mm diameter nichrome wire. On 240V(rms) voltage this makes 25A(rms) current. I have an access to a mains line capable of delivering 30A, so in theory I will be able to drive heater at full load. In reality I probably won't, but nevertheless, I want to build a unit that could do that in theory if needed.

My question is - what should I take into account when building a simple optotriac/triac/zerocrossing circuit when moving from 8A triac to 40A triac?

Triac i'm going to use is this: BTB41

My schematics looks like this: