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I have a five year old NTI boiler. In the last two weeks I have had no heat which required replacing the low water shutoff due to a leak. This fixed the heat for a week or so, then no heat again (but we did have DHW). They replaced the 'three way valve'. We then had heat, but the DHW has become tepid. Even shutting off the tempering valve, the DHW is barely warm. They are now trying to flush the heat exchanger. ( the water here, from a drilled well, is high in iron). DO they know what they are doing?