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What does turning on summer mode on NTI combi actually do

harry_fine Member Posts: 9
I noticed on my NTI FTV110C on the companion app and I assume in the menu settings, I can put the combi boiler into summer mode. What does that actually do, any downsides?


  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
    I would assume it will shut off the Heat but keep on the Hot Water ....

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  • Alan (California Radiant) Forbes
    Just guessing, it probably turns off heating mode and works only in domestic hot water mode. It prevents the boiler and pumps from turning on even when a thermostat calls for heat. 
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab