My hot water tank cannot heat up water in extrem cold weather, like -25 degree celsius. I called my plumber who replaced the hot water tank for me three years ago when this happened the same year he replaced it for me, he suggested me to turn up my temprature gauge on the tank. But it does not help. Usually I am not too worried because when the weather comes back, the hot water comes back, too. This has been happening once per year in the past three years.
However, it happened twice in recent two weeks, because the extrem cold hit us twice. This second time has been three days, and I expect it to last for another two/three days, looking at the weather broadcasting.
Why is the cold weather affecting the tank? The tank is in my basement, where is pretty warm - 18 degrees celsius.
My tank uses natural gas, I believe.