300MBH Boiler

Al Letellier_9

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

Chuck_17

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

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

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.

NOTE:
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.
MG



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vtheat

viessmann vitola

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