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TBSE on a very long radiator

Discussion in 'Plumbing and Central Heating' started by phloaw, 2 Jun 2021.

  1. phloaw

    phloaw

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    I have a 225cm wide, 45cm high radiator on a standard vented, 8mm microbore two-pipe, fully pumped system.

    I am getting rid of its old twin entry radiator valve to install a trv, so I need to decide where to position it and the lockshield.

    Easiest option would be TBSE (top-bottom, same end) on the left side of the radiator, with a bleeding valve on the top right corner of the radiator.

    However, intuitively, I imagine that with such a long radiator, even if the circuit is pumped, hot water could have a hard time getting from the left end to the right end of the radiator if both valves are on the left end.



    Does this make sense, or TBSE will work nevertheless?



    Thanks!
     
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  3. muggles

    muggles

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    Can't see TBSE working well on that at all. Better off converting to BBOE
     
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  4. oldbutnotdead

    oldbutnotdead

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    Depending on the radiator design you might be able to get an injector valve in but 2250 is a long lump to thread in...
     
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  5. phloaw

    phloaw

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    BBOE difficult due to stubborn nut on the radiator.
    What about TBOE?
    Thanks!
     
  6. D_Hailsham

    D_Hailsham

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    You say that, but BS EN442 requires rads to be tested using TBSE. It, allegedly, gives 2% more output compared to BBOE.
     
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  7. phloaw

    phloaw

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    That's interesting.
    However, I understand such standard was enforced only around 2013: is that correct?
    My radiator probably predates that (by a lot?), hence I wouldn't risk with TBSE.
     
  8. polesapart

    polesapart

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    Just get a room, fellers..
     
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