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Not enough heat from a SYSTEM 2000
We installed a System 2000 in Feb of 2015. It replaced a Weil McLain (sp?) wet base tankless boiler.
We have not been able to get the room temperature up to 68 when it is cold (10 F or below) with this system.
We have 2 rooms that rely on heat from the other rooms and the old system handled it with no problems.
The system 2000 struggles to get the house to 64 when the thermostat is set to 72.
Here are my thoughts on the problem. Please let me know if this makes sense or give me some other ideas.
The nozzel is undersized limiting the fuel burn rate. The old system was oversized and the fuel orfice was selected for the volume of space to heat.
The circulators are not large enough. The old system had big (1/4 HP circulators) My thought is that the existing circulators cannot pump the water fast enough and the temp drop too big.
Another idea is that the boiler capacity is too small vs. the old system and and the water temp is too low to start with.
My installer's answer is to add more base board to the unheated rooms but if the old system worked why cannot mt $10000 system 2000 do the same job. It may be more efficient but it does not supply the required heating.