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Optimal Temperature Setting

Marc_15 Member Posts: 1
What is the optimal temperature setting on an oil boiler? Is it actually more efficient to set higher?


  • bill nye_3
    bill nye_3 Member Posts: 307
    It depends

    It depends who you talk to. If you had outdoor reset the optimal temp would be the temperature needed to replace the heat lost in the room at that exact moment. Warmer ouside - cooler boiler water, colder outside - hotter boiler water temp.

    If you have a tankless coil boiler it doesn't really matter because if you lower the temperature you won't have hot water at the faucett. Tankless coil production, GPM, is rated for 200° boiler water.

    Most boilers with a tankless are generically set 160/180°

    If you have more radiation than you need you can lower the temp and still heat the house. If you have inadequate radiation and lower the temp, you will be cold inside when the outside temp drops below 20°

    If you lower the temp you will have less standby loss.

    It really depends on controls and enviroment. If the water is too cool you wont get the house heated.
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