Don't get me wrong, I use a heater. But if a breaker trips and the heater shuts off, causing the water to freeze...I would rather the pressure to be released, allowing the water to freeze without damaging anything.I would rate this right up there with the pull out method of birth control.
I have a remote temp. gauge that I bought from amazon.What if the nipple area freezes first .. then theres no room for the expansion
Get a circuit trip alarm or temp drop alarm !!
I agree. I would never depend solely on that thought of giving water a place to expand. It's just something else to help prevent any major damage if and when the heater fails.It makes sense in theory but the reality is if its cold enough to freeze, you're only partially protecting one area.
Not only can you still have trouble there but way upstream there is going to be a world of hurt coming.