We live in a brick house with pier and beam and I've gone to great lengths to place those foam insulating wraps on outdoor faucets. Plus had cutoffs installed down below each one which I then stuff thick insulation in the box and cutoff the faucet. Our washing machine is in the garage that faces due north and usually 10 degrees less than outdoor temp. I have the two risers wrapped plus the two hoses going to the machine. We drip all faucets indoors, sinks and bathtub both hot and cold sides when it's this cold and been successful during the Texas freezes past few years. But my question is, the hot water heater, washing machine and even toilet have no way to "drip", is it something to even be concerned about since been good all these years ? Am considering having all the copper lines replaced and insulated under the house and walls and forget about it. House built in 1950s.