I know to winterize a camper you fill the water lines with antifreeze. I suppose to be really protected you'd need to go that route.
We live in a townhouse with a garage on the main level, so the water comes in on the main level, but basically all of our plumbing is on the upper levels. I've had several times when dealing with different plumbing issues where I turn off the main water valve, then open all the faucets and let the water drain out through our water heater.
I guess the weakness in that approach would be if there was a bend in the pipe somewhere to not let the water drain fully out, it would still freeze. I guess that's probably why people do the antifreeze method when actually winterizing water lines.
We live in a townhouse with a garage on the main level, so the water comes in on the main level, but basically all of our plumbing is on the upper levels. I've had several times when dealing with different plumbing issues where I turn off the main water valve, then open all the faucets and let the water drain out through our water heater.
I guess the weakness in that approach would be if there was a bend in the pipe somewhere to not let the water drain fully out, it would still freeze. I guess that's probably why people do the antifreeze method when actually winterizing water lines.