Yeah, boiler plumbing can be deceptively tricky. Had a similar experience a few years back—thought everything was solid until mid-January hit and woke...

Been there—definitely not a good time. I'd also suggest adding a simple overflow valve or hose to direct excess water safely away from your foundation...

I've seen angled screens work pretty well too, but one thing to watch out for is debris buildup—especially leaves or pine needles. If you're DIYing it...