Question... Mod Cons are gaining huge popularity. some have SS innerds, some have combo SS and copper...

So any of them have an issue with type of metal that the rest of the system is made of???????

I mostly install with O2 blocking PEX, iron pumps... and copper for a main loop... or sometimes out to baseboard.

I have just starting falling in love with Triangle Tube mod cons.

All you pros... completely fill me in on this subject of disimilar metals please?

ie... a home full of iron radiators... a place in Colorado with lots of feet of iron in concrete radiant loop...

my main worry after disimilar metals is crap in the system... myself... I would install a crap catcher always.

aj

I am not aware of ANY ModCon with a copper heat exchanger.

The metallurgy in a residential boiler has no effect on the radiators or vise versa.

Badger.. what about crap coming from an iron system going thru mod cons... and pumps...

seems like big old iron boilers could handle such better?

You make a lot of assumptions.

"IF" you have a lot of "crap" in your system is should be flushed and/or cleaned out. A strainer may be installed among other remedies. But the boiler selection has nothing to do with any of it...unless you believe a the best use for a low efficiency, high mass (water volume) cast iron boiler is to serve as a dirt separator in which case we have no argument.

Large pathways for heat medium serve to lower head pressure for the pump and "may" increase heat transfer efficiency. That it.

I think the main reason I am concerned about disimilar metals... is.... my tiny chemistry education and my experience with boats trailers and planes having terrible problems with bolt rusting and failures... I have built I think 12 planes by now... and boy... one does not want to have a failure more than a foot off the ground. 

I also now install lots of PEX... and the zurn failures astound me... then Lstiburek and his great as usual story about the Vegas water... and brass. So now..... I am into plastic wirsbo fittings with my PEX... plastic Marathon lifetime water tanks... TT boilers... and may switch to SS circulators...

Good water... PEX... Copper... SS... I like... the rest... I am not qualified to play with...

Oh.. and before you jump... I have pulled a million feet of galv plumbing pipe out of old camps around Lake George... yes it worked for 50 years...

The thing is... like others have said.. I like the idea of building for at least 100 years... and then make all such that retrofitting is simple enough so as to go for a 1000.

good water... and happy materials... I like.
aj

hey... I may be starting to see my bias...

You are mixing open plumbing experience and close hydronic experience. They are unrelated.

closed systems have happy metals always? ... I do know about the o2 thing... and leaks adding o2 water...