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indirect water htr

GJM
GJM Member Posts: 4
in THE MAIN WALL
Lack of hot water. Installed with WMVH series 147M output.Hot water output has been declining. Inmmersion well date coded 1990 was replaced this week. Now no hot water. Boiler is running fine. Suggestions?

Comments

  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    is the pump....

    broken? Are you getting good flow to the indirect? You could only be getting gravity flow. Is the zone calling constantly? How is your water hardness? the coil could be liming up, giving no heat transfer. kpc
  • Einsiedler
    Einsiedler Member Posts: 61


    plugged up coil perhaps??
  • hot_rod
    hot_rod Member Posts: 23,392
    Check

    the delta T across the coil. A nice dual temperature meter helps, but you can do it with one gauge. Digital thermometers make it quick and easy. This will help determine if the pump is working and show the heat exchange rate in the tank.

    How's the domestic water hardness. Finned coil type exchangers can plug (on the outside) rather quickly. The hotter the coil (boiler supply) the more calcium is pulled from the water, it seems

    . An electric water heater element is a good example of how hardness attracts to a hot surface.

    If it started out adequate and has been a slow decline my first guess would be a limed coil.

    This coil went from new to "Stone Cold Steve Austin" in less than 6 months!

    hot rod

    To Learn More About This Contractor, Click Here to Visit Their Ad in "Find A Contractor"
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542
    WOW...

    nice slug o lime there bucko. You could use that to neutralize the condensate of condensing boilers eh...

    ME
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