If it is still starting when it is 20F You have a great starting system and great glowplugs. Normal 1.6's and normal 1.9's start rough at 20f too. I wouldnt complain
...BTW your Bieber avatar is awesome.-Malone
Blocksmith, I think by "doesn't work" he meant the block heater failed and doesn't get hot anymore.
99% of my troubles with the block heater were not the piece in the block but the cord to the piece in the block. But if you have the heater installed already either failure is easy to replace in car. Just cold if outside and wet if you don't drain the block.
You are running a Franken with a too thick head gasket, complaining about starting issues at 20F?!? By the way, your turbo is surging up high so better make that wastegate do it's job before your turbo detonates.