hello all, seeking some advice.
i am trying to make it through the winter in a fixer upper house with a questionable gas furnace and gas hot water heater. in the last 2 months, there have been 2 gas leaks (fixed) and most recently an intermittent carbon monoxide leak, peaking at 200ppm on the nearest detector 15ft away.
i was able to stop the leak by replacing the foil tape on the flue and hot water heater exhaust pipes. (older foil tape was already present on the vents when i purchased the house.) detectors now read 0ppm and register a peak of 10ppm over the course a week. great. however the foil tape itself gives off a bad burning plastic smell when the flue gets hot. i thought it might go away but it has been a few weeks now. the fumes travel through the entire house and i am sure it is not healthy to breathe in.
i have tried two foil tapes. one from the hardware store rated for 200F, and one from 3M rated for 600F. both tapes emit the same caustic smell when the flue gets hot. i doubt it is going anywhere near 600F.
any recommendations for flue tape that will not smell? or an epoxy or something else that might do the job?
alternatively, do you think replacing the flue, hot water heater exhaust vent, and Y-pipe is a relatively cheap job? i will call a contractor tomorrow about this but i am curious what people think is a decent price for such a job.
finally, because it is a fixer upper and pending complete demolition in several months, i cannot spend more than a few hundred dollars to fix this issue. anything above that and it will make more sense dollars-wise to move out.
thank you and happy thanksgiving.
edit: here is a picture of the horrid setup https://i.imgur.com/IIKvNuY.png
replacing the foil tape in the blue area fixed the carbon monoxide leak, however the tape itself gives off a burning plastic smell when heated.