Are you certain it’s the intake and not the exhaust? The exhaust gases have a lot of moisture in them, and as soon as it hits that -30, it condenses and freezes. Over time it builds up to the point that it blocks off the exhaust pipe, which causes the hot water heater to fault and quit.
I don’t think I’ve ever had a call out where the intake is the one that freezes up. But if that’s the case, i would suggest having your plumber move one of the vent pipes, or if the intake is downwind of the exhaust, he might be able to switch them around inside the house.
Some simple 3” pipe insulation might be worth a try, for the inexpensive cost of it, but for the most part, we’re at the mercy of the elements.
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