The main problem isn't hot climate country, the problem are countries with low levels of security on home electricity installations. I didn't read any news about an s7 minner burning a house.
I'm still waiting on him to provide a link his claim just holds no merrit. To say that it would need to have started multiple and be the cause... I don't see any (and I could be overlooking) fires burning down houses that are linked to a S7 causing.
I think bad electrical and crappy PSU's are much more likely if it did happen as reason. But still.... we just don't see news of this. I will be surprised if he can point us to one house being burnt down due to S7 honesty.