heat detector triggers at 58 deg, C. mounted within 6 ft. of hob. smoke detectors in kitchens are a no-no. every time you do toast or fry bacon, they go off. i was lucky. the flames off the chip pan were only 2 ft. high. a wet towel sorted. now have a dry powder extinguisher, same as the one in the van, in kitchen . best of it was, the parnoid d-i-l-called ambulance and fire service. all the fire boys did was to take the still hot but out chip pan into the front yard and cool it with a water hose. ambulance service wanted me to go to ozzy (smoke inhalation ). sod that. dogs left home alone and no beer in ozzy. no brainer.