Viega FostaPex issues

Hi All.

Someone may have posted awhile back about Viega FostaPex O2 issues….

This product was on the market for years and it had some nice benefits. Solid, no drooping, bendable to a point, simple connections.

Viega pulled it from the market for some reason a couple years back No explanation. Local rep had no explanation.

Now i am wondering in O2 ingress was the reason and the higher ups have kept this under wraps to allow plausible deniability.

I was called for a no heat call last week. Circulator was done. (Grundfos 15-58).

System is an Adu installed in 2009. 3/5 Fpex. 10 feet on HW baseboard, kick-space heater.

When I went to purge out the loop I was stunned at how little flow was going through the piping. To attempt to force the flow I cut in a second boiler drain and street pressure (65psi) to blow out any junk.

I was surprised to see sediment in the bottom of the piping.

When purging I got A Lot of rusty hematite laden water from the loop.

More troubling the flow rate was terrible. maybe 1-2 gallons a minute.

I added a tube of Fernox cleaner to the system and let it run a week.

Returned a week later and very little change.

The loop gets some flow w/ a 0015 on high speed.

Next step is to either pull out tubing or try to flush out junk w/ a flush cart.

Pix to follow.