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does this make sense? (leo g)

leo g_13
leo g_13 Member Posts: 435
in THE MAIN WALL
I'm coming up to a project that we are only doing radiant floors, no DHW, baseboards, etc. The engineer called for the boiler to be a Burnham or same, so we are going with the series 2 (no, the contractor will not splurge for condensing!).

What I am wondering is if there would be any harm in setting the boiler aquastat to cut-off at 160-165*F? The system will be injection outdoor reset. What made me think of this was that old rule of thumb about for every 3* you lower the temp, you save 1% of energy.

So will this fly, or do I have have to leave the high limit at 180*F?

Leo G

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Comments

  • Ken_8
    Ken_8 Member Posts: 1,640
    As long as you set it

    above the condensing temp - and size the boiler as "tightly" as the load and good design suggests, you will be fine with a substantially lower than 180° setting. Variable speed or three-way mixing may keep the boiler water temp in the sweet spot and fuel savings (as you already know) may be substantial!

    Of additional concern, Murphy's Law may be overcome to some degree,by leaving a low aquastat setting - in that the aquastat would also have to fail - should the tubing temps get close to their maximum acceptable operating temperature limits?

    So, by dropping the typical 180° down some you get two benefits. Runaway system temps safety margin for tube extreme overheats - and better efficiency.

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