I've got a client in Brooklyn who's heating most of his home with Steamview radiators:http://steamradiators.com/pdf/steamview-radiator.pdf
I've installed a few dozen of these radiators and about 200 of their other product, the Charleston Pro model, and I've never had an issue.
In this residence, he's had to replace 5 (or 6) radiators due to them springing leaks at the welds. The boiler is fine, there are no other leaks anywhere, and he's claiming to have had to replace air vents several at a time every season since he's bought these radiators to stop them from spitting steam. We're running about 18 ounces of pressure at the boiler and there's not much else to report except these radiators keep springing leaks. Runtal has replaced every radiator immediately but they're saying they can't send him any more radiators because there must be some field condition that is causing the leaks. I'm inclined to agree with them. I sent a water sample to a lab and they came up with slightly elevated levels of lead, iron, and manganese. Also the pH was kind of high at 8.85 but I've tested boiler water higher than that before.
I think the high levels of metals in the water could be attributed to the breakdown of the radiators but I'm not sure if that's actually the chicken or the egg.
Any thoughts about why this is happening... or similar experiences and your approach to resolution are appreciated.
For private consulting services, find John "JohnNY" Cataneo here at : "Heat Advisory, LLC"
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John is a professional Master Plumber by trade, licensed by The Department of Buildings of The City of New York, but travels regularly to out-of-state clients for consulting work.