antifreeze
to prevent future issues, have your plumber/heating guy fill the boiler and pipes with antifreeze. there is a type specially for this purpose. an anti-backflow valve (may already be present) will also be needed to keep the AF out of your domestic water system. very simple and not too expensive and then your problems are over.
as for thawing the current pipe out, I believe you are currently doing the right thing.
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