After reading another thread I am wondering about the heat settings and savings in wood. Once the unit is up to temp and the water is heated, does it make any difference what temp you set the unit at. If it is going to heat the water 5 degrees every time it fires what difference does it make if you are heating to 150, 160, or 170 degrees? It still only heats 5 degrees every time it fires no matter what temp it is heating to. Of course the savings is going to be not heating all the way to the higher temp the first time.
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warm in VT said:
Unless I misunderstand your question, there's no 'when it fires'. The boiler typically runs at full bore until the outlet starts to approach the setpoint. As it starts to get close, the controller will start to slow down the fan (or perhaps close a damper - I speak from my personal experience here). If the outlet temp exceeds the setpoint, the controller may shut down the boiler as much as it can - by turning off the fan, for instance.
For an indoor boiler, there's no lost energy in heating the boiler higher. You'll get that heat back at some point. The only loss is that a higher water jacket temperature means a higher flue temperature so you're losing a bit more up the flue.
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