MinnesotaEric
Super Member
As some of you know I'm a real estate broker in North Central Minnesota. A house that I'm representing the buyer has more corrosion on the in-floor heating manifold than I've ever seen and I'm concerned. Check it out.
The photo on the left shows one run down into the in-floor heating, but once the pipe insulation was removed, the entire manifold was crusted up just as much as what we can see in the lefthand photo. The photo on the right is immediately above the manifold and ties into the manifold and it appears the corrosion is traveling to the unions from the manifold.
Question: Am I looking at electrolysis from a lack of a proper grounding? Dissimilar metals at work?
The system was installed in 2006. In 2018 the boiler was updated to a nice, big Weil McLain.
My concern is if there are any junctions in the cement floor, then could they be crusting up as much, or is the manifold the sacrificial anode for reasons yet to be explained? I'd love to hear everyone's' thoughts and experiences. We have a shortage of tradesmen up here and for this reason, I'm asking the collective brain-trust about the reason for the corrosion on the forum and if I should get the seller to get the manifold replaced? Thanks!

The photo on the left shows one run down into the in-floor heating, but once the pipe insulation was removed, the entire manifold was crusted up just as much as what we can see in the lefthand photo. The photo on the right is immediately above the manifold and ties into the manifold and it appears the corrosion is traveling to the unions from the manifold.
Question: Am I looking at electrolysis from a lack of a proper grounding? Dissimilar metals at work?
The system was installed in 2006. In 2018 the boiler was updated to a nice, big Weil McLain.
My concern is if there are any junctions in the cement floor, then could they be crusting up as much, or is the manifold the sacrificial anode for reasons yet to be explained? I'd love to hear everyone's' thoughts and experiences. We have a shortage of tradesmen up here and for this reason, I'm asking the collective brain-trust about the reason for the corrosion on the forum and if I should get the seller to get the manifold replaced? Thanks!