Having lived on both sides of the mountains I agree with Hoppers4. Not only is the water heater exposed, but the outside shower, assuming you have one is also a concern. We saw some cold temps when we lived in Gig Harbor. Also a power outage would prevent using a space heater. Better to be safe than sorry...also freeze breaks happen in the worst places.
2011 Jayflight 23FB G2
2003 Chevy 1500 4x4
Wife Peggy and 2 Beagles and a rescue Cocker Spaniel
2007 Yamaha Grizzly 400 ATV and Yamaha 2000 watt Genny
Me/retired insurance claims and DW/retired RN.
"If the women don't find you handsome, they should at least find you handy."-Red Green