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Low Hot warter Temp.

I have a Boiler That  I installed 4 years ago.  I am using it to heat the house with underfloor pex and I also use it for my hot water.  Lately the hot water has been getting colder.  I have a super Stor 50 gal tank that is connected to the Boiler through a Taco 3 zone relay and the aquastat on the super stor is a Honeywell L4006.  The Honeywell is set at 145 but the water is about 120 at the tap 25' away.  Should I suspect the Aquastat first?  The boiler temp appears to be right up there at 180.  Pressure appears to be good as well.  


  • Charlie from wmass
    Charlie from wmass Member Posts: 4,253
    120 is normal temp

    Do you have a mixing valve on the tank outlet? 120 is normal for safe water temp. The tank and boiler temps should be higher than the tap temp.
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  • Ed Lentz_2
    Ed Lentz_2 Member Posts: 158
    Low Hot water Temp

    No mixing valve.  the boiler water is fed directly to the SS loop.  the Honeywell controls the temp of the tank.  The hot water has always been sufficient in volume and temp since everything was installed.  The boiler temp is set at 180 so that is always higher than the how water temp control at 140 - 145.  The boiler doesn't seem to be running more than normal, that's why I suspect the Honeywell.
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