I have an EKO wood boiler and want to run my baseboard temps lower was thinking of setting it at 120

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Running lower baseboard temps won't necessarily save money - you need to create and deliver the same number of BTUs either way and you'll have to circulate more water to do the job at lower temps.

If you have a LOT more baseboard than you need (by conventional design standards) you can run lower temps with two benefits:

1) Lower boiler temps mean less loss to the boiler room and slightly less loss up the chimney. In the boiler room is indoors it's probably only a percentage point or two, but there is some advantage.

2) If you're heating from storage, having enough baseboard to heat the house with cooler water means that your effective storage capacity is larger (for the same storage tank).

That being said, you never want to operate a boiler with an inlet water temp below 130 (140 is safer). If you do, you can get corrosive condensation inside the boiler because the flue gasses will condense on the cold jacket. Since most systems will yield a temperature drop of around 20 degrees through the heat loads (baseboards in your case) you'd need to have a minimum outlet temp of 150 to keep your inlet above 130.

You can use a mixing valve to provide a lower temp to your baseboards, although that's more often the approach for radiant floors which need much cooler temps. Some systems vary the temp of the water in the radiant floor based on the outdoor temp - nice way to avoid sudden temp fluctuations because zones are always on, not cycling on and off.

If you don't have one, you should also have some sort of inlet temperature protection. That's usually accomplished by a valve or circulator (or combination) that mixes enough hot water from the boiler outlet with the cold return to keep boiler inlet temps above 130-140.
 
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