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pipers Member Posts: 21
The term cold start boiler; what is a cold start boiler and what is the difference 


  • Paul Pollets
    Paul Pollets Member Posts: 3,656
    A cold start boiler turns on when the aquastat calls for heat from the thermostat. It shuts off when the thermostat is satisfied and/or the aquastat reaches high limit. Some older boilers maintain an internal temperature, rather than shut down.
  • pipers
    pipers Member Posts: 21
     I heard that term from an oil guy on YouTube i think I understand, oil boilers have tankless coils and would need to maintain temperature for the domestic hot 
  • SuperTech
    SuperTech Member Posts: 2,120
    Not all oil boilers have tankless coils, most don't. Be careful about who you listen on YouTube, especially when it comes to oil burners.  I have seen a lot misinformation spread on there.