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Thread: OpenTherm with two boilers & other related questions

  1. #11
    Automated Home Sr Member
    Join Date
    Aug 2017
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    60

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    Quote Originally Posted by dty View Post
    Ah yes. I have a LLH (actually closely-coupled tees) because the boiler's built-in pump didn't have enough head left after the losses in the HEX.
    What's an LLH?
    Both my current old Valliant's have their own built in pumps and seem to drive the system ok

    Best wishes
    James

  2. #12
    Automated Home Ninja
    Join Date
    Mar 2017
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    Quote Originally Posted by Jabes View Post
    What's an LLH?
    Both my current old Valliant's have their own built in pumps and seem to drive the system ok

    Best wishes
    James
    Low Loss Header. They're used on larger systems and when there's more than one boiler. You'd have a system boilers that pump into the LLH, then depending on which LLH you have you'd pump separate zones out of the LLH with each zone having it's own pump.

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