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"Summerizing" hydronic radiant heat?

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doughpat
doughpat Member Posts: 36
in Radiant Heating
I have a Lochinvar combi-boiler serving two zones, one being a slab-on-grade, the other being a second story joisted floor.

We haven't used the heat in a few weeks and obviously that trend will continue through summer and most of fall.

Is there any kind of seasonal maintenance and/or preparation I should perform on the system? (FWIW its 99% Pex with copper manifold/boiler plumbing)

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  • GroundUp
    GroundUp Member Posts: 1,908
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    The HX "should" both be cleaned and combustion analysis performed annually, but not necessarily now.
  • JUGHNE
    JUGHNE Member Posts: 11,062
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    I have some wet rotor Grunfos pumps that will seize over the summer.
    Fortunately they have the large plug in one end that allows you to manually rotate the shaft. Most new ones do not have this feature.
    Some boilers have pump exercise modes because of this.
    If not then maybe have a heat call every few weeks to keep the pumps loose.

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