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300MBH Boiler

Buderus 215...made to handle the shock and they have great contorls, too....


  • Chuck_17
    Chuck_17 Member Posts: 143

    Any recommendations or suggestions for a cast iron boiler, nat. draft around 300MBH input, used for a small apartment building with baseboard and unit heaters. I want to used outdoor air temp reset. The main concern is boiler shock. Any boiler of this type/size that is less susceptible than others?
    If they are all the same, what control and piping things should I not forget
  • Maine Ken
    Maine Ken Member Posts: 531

    First thing that pops into my head would be multiple boilers. Could save tremendous on fuel and wear & tear.

    Maine Ken

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  • Mike20
    Mike20 Member Posts: 37
    In My home I used a 2 stage thermostat

    Forget about the out door air reset and use a 2 stage thermostat instead. Let stage 1 turn on the circulator pump and stage 2 turn on the burner. This way the boiler always has time to gradually heat up and cool down thus eliminating the thermal shock factor. ( This is only applicable when the boiler is used for heat only not hot water)

    My cast iron boiler has been running this way for years with no problems.

    If you are replacing the boiler you should consider a high efficiency – fully condensing design for fuel economy. The Munchkin boiler has a cool feature for added efficiency of a modulating fire. You should look into it before making the final call on this new boiler.

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  • vtheat
    vtheat Member Posts: 8
    viessmann vitola

    viessmann vitola 200 can handle very low return and offers a wide range of control options
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