"dgk" wrote in message
...

As an aside, I'm putting in a Carbon Monoxide detector. I never
bothered before because the furnace has an automatic CO shutoff

Bull****...

and I
didn't think of the water heater as a potential source for CO; I
thought of it more as the vent from the electric dryer. That thinking
has changed. Obviously it is no where near as dangerous as the
furnace,

More bull****...