graham wrote:
>
> On 21/11/2014 10:43 AM, Brooklyn1 wrote:
> > On Thu, 20 Nov 2014 19:40:42 -0500, "Pete C." >
> and in case of a protracted power failure I
> > have a ventless propane heater in my basement that can heat the entire
> > house even at -30ºF... ventless gas heaters need no electric and need
> > no chimney,
>
> Surely there must be some sort of vent to the outside to deal with the
> CO and CO2.
> Graham

Nope. Those heaters normally have an oxygen depletion sensor that will
shut them down, but they indeed have no outside exhaust. You certainly
should have a decent CO detector in the house, but the gas burners don't
product much CO if they are in proper condition, CO2 isn't typically a
problem either. They do produce a fair amount of humidity which is why I
don't use such a heater in my shop where it would rust expensive tools
in short order.