Thanks for the heads up OLDphoneman I'll look into those asap. Right now I use electric heaters in trailer b/c they are only $59 each. With electric, CO is not issue-though I know of people who use kero-suns in the winter for space heating-I don't. I have a superinsulated home-so venting of heat buildup is sometimes necessary but, any kind of fume or CO isn't...As I get older safety isssues become more important.....thanks again, geof
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