I remember that fire.

Sorry to hear your family lost their boat. Did the fire investigators determin the the age of the heater? I'd bet a buck it was at least a few years old, but probubly older then that.
Cal's right, using a heater/fan will increase the risk of a fire, but if you purchase one new, check it regularly, and toss it at the end of the season the risk is very low.
Your not kiddin cal, L Dub can be one rough puddle. Kenmoore before 1000 my spot of choice. How many other seattle locals are on board?
Highflyn