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  1. First The AO Smith is a Takagi made in Japan and...

    First
    The AO Smith is a Takagi made in Japan and labeled AO Smith
    The Navien is made in S Korea

    Second
    Don't use a tankless water heater as a boiler for your radiant heat, you will be sorry in...
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    Its the X1 & X2 with no jumpers on them from the...

    Its the X1 & X2 with no jumpers on them from the line voltage side
    Use the cold start example (the TT is the combi connection)
    With no jumpers they are dry contacts that go to the CH R&W or the...
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    CH model Navien combi

    I very familiar with the Navien CH combi boiler.
    The taco SR 502 is a two zone circulator switching relay that also has a XX terminal output that is used to activate a boiler (dry contacts)
    The...
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    Yes but what I wrote above is only hydronics 101...

    Yes but what I wrote above is only hydronics 101 stuff. Many "experts" have been stumped at install problems not knowing the simple things.
    BTW 5 stories would require about 23 PSi cold pressure to...
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    No boiler guys answered yet? The standard...

    No boiler guys answered yet?
    The standard setting is 12 lbs cold. 1 PSI will raise water in a column 2.31 feet.
    The pressure should be set to what is required in total height of system. For...
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    Like they say above, but tell us more Is it the...

    Like they say above, but tell us more
    Is it the only pump? (tankless and floor loops)
    If it is, reconfigure the system as primary/secondary, there by controlling the tankless flow rate to within...
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    It's actually not new

    It was developed about 3-years ago and it's acceptance by the industry was dismal at best. The new Rinnai Japanese US president decided to reintroduce it partly because of the larger interest lately...
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    The Naviens use a flame rod, to sense burner...

    The Naviens use a flame rod, to sense burner operation.
    Error code 12 means flame loss. This would be due to improper sensing because of a flame rod issue or grounding, or loss of gas supply or...
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    One more thing Navien states it allows 1/2" gas...

    One more thing
    Navien states it allows 1/2" gas line because it allows inlet pressures as low as 3.5" WC. This allows for higher distribution piping pressure drops but does not allow the installer...
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    Both heaters you noted are high-efficiency...

    Both heaters you noted are high-efficiency condensing and actually the colder the inlet water the more efficient they are. Cold temps don't hurt the units but can reduce output because of desired...
  11. All crown boilers, all boilers for that matter...

    All crown boilers, all boilers for that matter have heat exchangers approved for section 4 of the ASME code which states they have a maximum allowable pressure of 160#

    The distributor that...
  12. Bgkiggs My advice is basic hydronics 101 stuff...

    Bgkiggs

    My advice is basic hydronics 101 stuff
    Anyone that does higher than 2-story or commercial knows this.

    Read page 2 of instructions, for a second opinion, they are adjustable for a...
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    12 psi is the cold start pressure. As water heats...

    12 psi is the cold start pressure. As water heats it expands and presses against the precharged bladder. At full temp of 180 degrees the system will normally be in the low 20's in pressure.
    A bigger...
  14. .434 PSI per vertical foot of elevation... Plus...

    .434 PSI per vertical foot of elevation...
    Plus 5 PSI

    35 feet rise between boiler and heat emitters?

    That means you need about a 21 PSI cold starting pressure
    This also means you need to...
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    I remember that pump has to be 15 years old. I...

    I remember that pump has to be 15 years old. I used it on my cottage before I drilled a well. It was later replaced ** the JQ2&4 but those operated differently.
    12-16 years of service, time for a...
  16. You could get a Jandy 1-1/2" 3-way valve made out...

    You could get a Jandy 1-1/2" 3-way valve made out of CPVC and an 24v electric actuator for $200.
    No NSF or anything but it will handle the pressure and flow.
    ...
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    ^ ^ obviously not with the steel beam columns...

    ^ ^ obviously not with the steel beam columns shown in the pictures ^^
  18. They waste water and fail, wasting even more...

    They waste water and fail, wasting even more water.
    Best choice to control thermal expansion is a potable water expansion tank pre charged properly at the water heater inlet.
  19. Proves the Asian fascination to pooping

    Proves the Asian fascination to pooping
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    Have you verified that the onix tube and the PEX...

    Have you verified that the onix tube and the PEX is the type with an oxygen barrier, meant for radiant heating?
    Early onix and PEX for potible without a oxygen barrier would do this, allowing oxygen...
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    Unused as installed but not operating? Yes it...

    Unused as installed but not operating?
    Yes it will cause a reduction with water having to flow through additional passageways such as check valves, impellers, vanes and additional pipe. Unless there...
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    The big question is You have the water service...

    The big question is
    You have the water service size to your home capable of giving you those flow rates?
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    Taco XX terminals is wired low voltage 18-2 wire...

    Taco XX terminals is wired low voltage 18-2 wire to prestige TT terminals
  24. Unless its on a variable speed constant pressure...

    Unless its on a variable speed constant pressure well system or a jet pump booster system and then 2-gallon well tanks are the norm.
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    It was illegal to continue manufacturing but no...

    It was illegal to continue manufacturing but no problem with selling and buying existing stock. Distributors bought truckloads of prior product of the flame safeguard systems required. Perhaps this...
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