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Is this good, professional advice?

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1925 building, 2005 boiler, 25-suite co-op. I previously posted about how I hear water draining from the boiler on the off-cycle, and cold water entering the condensate tank during firing. Here's what I found in the old files from the 2005 installation. The consulting engineer who wrote the bid specification (based on building heat-loss, not installed EDR) followed up with this "deficiency" to be corrected. (I'm no heating pro, but I'm pretty darn certain this is bad advice.) "Solenoid valve (on water make-up) should be interlocked so that whenever the level in the condensing tank drops below set up value, the solenoid valve will open the water supply and at the same time signal from solenoid valve will engage pump to supply water to the boiler." In other words, he told the contractor to make sure that every single time the condensate pump tries to return condensate to the boiler, it gets a healthy dose of fresh, cold, oxygenated water mixed with it. Can anyone tell me how long to expect our boiler to last????
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