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Hydronics frustration cold air no hot water
I have a 10 year old home with 2 furnaces and 2 60g gas water heaters. When I turn one of the 2 furnaces on, I lose hot water at all taps within a couple minutes. Also, the furnace struggles to keep the house up to temp. It mostly blows cool air. Both water heaters are tied together in a series. I've been told they are in a "closed system". I've had plumbers and HVAC guys out multiple times and nobody can fix it. It seems to me that something has to be wrong with the one furnace/air handler because not only does it blow cold air, but it prevents the faucets from getting hot water. The instant I shut this unit off, I have an endless amount of hot water. Just seems like a simple valve not opening/closing to me. I'm to the point I just want to buy an entire new system because nobody can give me a straight answer.