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Navien CH-240 and additional pump
Anyone have experience installing <strong>CH-240</strong> in simple 2 store building. Is additional pump required for such simple installation i.e single thermostat with no multiple zones ? I've just confused little bit that some contractor saying that additional water pump required even unit itself already have build-in water circulation pump. Manual not clear about this too. It doesn't indicate that pump is required for primary heating loop and only for secondary and other loops. What if I only have a primary heating loop ?