When we built the house we planned on installing a sprinkler system until we found out the cost and number of pressurized tanks needed. Opted for a fire extinguisher at every exit. More effective than having a house full of these:
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Just one of the very few disadvantages of living in the boonies.
Yeah . . . much more expensive if you have well water . . . typically you need to buy a couple of pressurized tanks which quickly adds up vs. doing the system off city water.
Ah . . . the old fire grenades. Is this one empty or is it filled with salt water? Typically I see these with a red or green filled liquid which is typically carbon tetracholride -- which can be quite nasty to the nervous system -- not to mention that it can convert to phosgene gas when it comes in contact with high heat.