That isn't the condensate trap, that is the condensate outlet from the
heat exchanger. The condensate trap is at the bottom where the
condensate pipe outlet is.
How do you get gunk in there anyway? Things crawling down the flue pipe?
AIUI 50C is sufficient to kill off Legionella.
I suppose that if you ran the boiler on a very low setting you might be
able to set up the conditions. I don't know how well the bacteria get on
with very dilute suplhuric acid which is what the condensate is.
Ed Sirett - Property maintainer and registered gas fitter.
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