Al wrote:
I wonder if this approach would work works with pots of damp sphagnum in the
winter when oil is too expensive to use to heat higher than 55 degrees.


IIRC, concentrated H2O2 can be had cheaper than Zerotol.

Keep in mind that it is nasty stuff. Pour it in a metal bucket, and
you can get a steam explosion. It breaks down violently in the
presence of metal catalysts like iron and copper.


J. Del Col