When I was building the house I ran a water pipe up to the roof and drilled down through the ridge beam in 3 places , ran the pipe through the holes and fixed fire sprinkler heads to the end of the pipe. The sprinkler heads are set to go off when temperatures reach 165 degrees. System should work as long as the pipes don't melt (I used CPVC) and the pump keeps working. Once the glass for the sprinkler breaks the sprinkler head opens just like offices have. Mine can only pump water from my cistern which depending on time of year could be no help at all. But the sprinkler heads are pretty cheap, about $10US in the states, the rest is running 1/2" cpvc pipe. Figured it'd work to at least wake me up to get the heck out. It'd be pretty easy to retro fit it on existing houses.